WO2017199796A1 - Structure de jonction et procédé de fabrication de structure de jonction - Google Patents

Structure de jonction et procédé de fabrication de structure de jonction Download PDF

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Publication number
WO2017199796A1
WO2017199796A1 PCT/JP2017/017578 JP2017017578W WO2017199796A1 WO 2017199796 A1 WO2017199796 A1 WO 2017199796A1 JP 2017017578 W JP2017017578 W JP 2017017578W WO 2017199796 A1 WO2017199796 A1 WO 2017199796A1
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WIPO (PCT)
Prior art keywords
ceq
insertion member
carbon equivalent
shaft portion
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2017/017578
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English (en)
Japanese (ja)
Inventor
恭兵 前田
哲 岩瀬
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Kobe Steel Ltd
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Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017074691A external-priority patent/JP2017209725A/ja
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to EP17799221.1A priority Critical patent/EP3459671A1/fr
Priority to US16/302,853 priority patent/US20190291202A1/en
Priority to CN201780030949.8A priority patent/CN109311116A/zh
Publication of WO2017199796A1 publication Critical patent/WO2017199796A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded

Definitions

  • the present invention relates to a bonded structure and a method for manufacturing the bonded structure.
  • HTSS high-tensile strength steel
  • a typical weld quality evaluation item that represents weld quality is the static strength of the joint.
  • Static strength includes tensile shear strength and cross tensile strength. Tensile shear strength increases almost in proportion to the tensile strength of the base material, whereas cross tensile strength decreases when the tensile strength exceeds 780 MPa. To do.
  • the toughness of the welded portion is lowered, and a load in the cross peeling mode is applied. In this case, interfacial fracture and partial plug fracture (break in nugget) are likely to occur.
  • the tendency is prominent, and various measures have been taken so far to improve the cross tensile strength.
  • Patent Document 1 in order to prevent toughness reduction of nuggets and element segregation in the nuggets, the contents of C, Si, Cr and segregating elements P, S, and N that contribute to the toughness of the nuggets are limited. It is disclosed that good cross tensile strength can be obtained.
  • Patent Document 2 discloses a base material hardness Hv (BM) and a weld bead (welded metal) for a plate assembly in which two high-tensile steel plates having a C content of 0.07% by mass or more in steel are stacked. It is described that a good cross tensile strength can be obtained by arc spot welding so that the relationship with the hardness Hv (WM) satisfies 0.7 ⁇ Hv (WM) / Hv (BM) ⁇ 1.2. .
  • Patent Document 2 relates to a technique for diluting a welding base material using a welding wire to form a welded portion having a predetermined hardness.
  • This technique has a problem that it is difficult to control because it is necessary to supply molten metal to a position where dilution is performed.
  • welded structures such as automobile bodies need to be welded at various angles (welding postures), and depending on the angle, it may not be possible to supply molten metal to the joint, which may cause problems in welding workability. was there.
  • Patent Document 3 describes that, by spot welding using high-frequency heating, hardness decreases from the nugget end to the center and a high toughness nugget is formed, thereby obtaining good cross tensile strength. ing.
  • Patent Document 3 relates to a technique for forming a welded portion having a predetermined hardness by spot welding using high-frequency heating, and a special spot welder is required.
  • the present invention is a joining structure capable of improving the joint strength (cross tensile strength) by increasing the toughness of the welded portion without impairing the weldability even in a high-tensile steel plate with a large amount of basic constituent elements in the steel. It aims at obtaining the manufacturing method of a body and a junction structure.
  • the present invention has the following configuration. (1) a first member made of high-strength steel; A second member overlaid on the first member and made of high strength steel; A steel insertion member held by the second member in a state where the second member is inserted from the opposite surface of the overlapping surface of the first member and the second member toward the overlapping surface; , A welding portion formed by melting the insertion member and the first member at an insertion tip of the insertion member;
  • the bonding structure has a carbon equivalent Ceq of the insertion member lower than a carbon equivalent Ceq of the second member.
  • the carbon equivalent Ceq is a value defined by the following formula (1).
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and 0 when not contained.)
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and when not contained, 0 is assumed.) Ceq (M1) + Ceq (M2) ⁇ Ceq (N1) + Ceq (N2) ⁇ (2)
  • the manufacturing method of the joining structure whose carbon equivalent Ceq (N2) of the said insertion member satisfied the following (1) Formula and the following (2) Formula.
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and when not contained, 0 is assumed.) Ceq (M1) + Ceq (M2) ⁇ Ceq (N1) + Ceq (N2) ⁇ (2)
  • the present invention it is possible to improve the joint strength (cross tensile strength) by increasing the toughness of the welded part without impairing the weldability in joining high-strength steel sheets.
  • FIG. 1 is a figure before insertion of an insertion member
  • FIG. 3 is a state after insertion of an insertion member
  • FIG. 3 is a process figure showing a state of a joined structure after insertion joining of an insertion member, respectively.
  • A) is sectional drawing of the insertion member shown in FIG. 1
  • B) is sectional drawing of the insertion member of a 1st modification. It is process explanatory drawing which shows typically the process of fixing an insertion member in the case of using the insertion member of the 1st modification shown in FIG.3 (B).
  • (A) is sectional drawing of the joining structure body before joining in which the insertion member was inserted without penetrating the 2nd member
  • (B) is an insertion member of (A) melted with the 1st member and the 2nd member It is sectional drawing of the junction structure joined by joining.
  • FIG. 1 is a view for explaining an embodiment of the present invention, and is a cross-sectional view of a joined structure.
  • the bonded structure 100 of the present configuration includes a first member 11 made of high-strength steel, a second member 13 made of high-strength steel, overlaid on the first member 11, an insertion member 15, a welded portion 19,
  • the high-tensile steel of the first member 11 and the second member 13 is composed of a high-tensile steel plate (HTSS) having a tensile strength of 780 MPa or more.
  • HTSS high-tensile steel plate
  • the insertion member 15 is composed of a rivet having a head portion 21 and a shaft portion 23 in the illustrated example.
  • the insertion member 15 is made of an iron-based material that can be easily welded to the first member 11 and the second member 13.
  • the insertion member 15 is formed by overlapping the first member 11 and the second member 13 from the opposite surface 16 of the second member 13 on the overlapping surface 12 of the first member 11 and the second member 13.
  • the second member 13 is held while being inserted toward the second member 13. That is, the shaft portion 23 is inserted in a state of penetrating the second member 13, and the head portion 21 is locked (fixed) to the second member 13.
  • the insertion tip 23 a of the shaft portion 23 and the first member 11 are joined by the welded portion 19.
  • the welding portion 19 is a joint portion formed by melting the insertion tip 23a of the insertion member 15 and the first member 11 by a welding process such as spot welding. The welded portion 19 firmly joins the insertion member 15 and the first member 11.
  • carbon equivalent is known as a factor that affects the cross tensile strength (CTS) of the bonded structure 100.
  • CTS cross tensile strength
  • Various formulas for obtaining the carbon equivalent have been proposed. For example, there is the following formula (1). If the value of the carbon equivalent Ceq represented by the formula (1) is equal to or less than a predetermined value (for example, 0.24% or less), the fracture mode in the cross tension test is good and the CTS value is not lowered.
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and 0 when not contained.)
  • the carbon equivalent Ceq defined by the above formula (1) of the insertion member 15 is made lower than the carbon equivalent Ceq of the second member 13.
  • the carbon equivalent Ceq (M1 / M2) in the welded portion 19 is the first member as shown in the equation (2).
  • 11 is the average value of the carbon equivalent Ceq (M1) of the second member 13 and the carbon equivalent Ceq (M2) of the second member 13.
  • the carbon equivalent of the welded portion 19 is at the same level as the first member 11 and the second member 13, and the toughness of the welded portion 19 is lowered without being less than the above-described predetermined value.
  • Ceq (M1 / M2) ⁇ Ceq (M1) + Ceq (M2) ⁇ / 2 (2)
  • the carbon equivalent Ceq (M1 / N1) in the welded portion 19 is equal to the first member as shown in Equation (3).
  • the welded portion 19 is diluted by the insertion member 15 having a carbon equivalent lower than that of the first member 11, and becomes lower than the carbon equivalent Ceq (M1) of the first member 11.
  • Ceq (M1 / N1) (Ceq (M1) + Ceq (N1)) / 2 (3)
  • the carbon equivalent of the welded portion 19 is higher than the carbon equivalent Ceq (M1 / M2) expressed by the above formula (2).
  • (M1 / N1) should just become low. That is, if the carbon equivalent Ceq (N1) of the insertion member 15 is made lower than the carbon equivalent Ceq (M2) of the second member 13, the carbon equivalent of the welded portion 19 is reduced as compared with the case represented by the expression (2). be able to.
  • the solid insertion member 15 is inserted into the second member 13, it is possible to arrange the insertion member 15 having an appropriate volume necessary for dilution in the welded portion. Thereby, dilution of a welding part can be performed efficiently irrespective of a welding attitude
  • the first member 11 and the second member 13 are high-tensile steel plates (HTSS) having a tensile strength of 780 MPa or more.
  • HTSS high-tensile steel plates
  • One or both surfaces of the first member 11 and the second member 13 are usually applied to a steel material such as a metal plating film such as zinc or a zinc alloy, an organic resin film such as a paint, a lubricant, and / or a lubricating oil.
  • a known film may be formed.
  • these films may be covered with a single layer used alone, or a multilayer formed by combining them.
  • the amount of components in steel of the first member 11 and the second member 13 is not particularly limited, but the desirable range of the content of each element (C, Si, Mn, P, S and other metal elements) contained in the steel and The reason for limiting the range will be described below.
  • % display of content of each element means the mass% altogether.
  • the lower limit of the C content is preferably 0.05% or more.
  • the upper limit of the C content is preferably 0.60% or less, more preferably 0.40% or less, and still more preferably 0.20%.
  • Si is an element contributing to deoxidation. Therefore, the lower limit of the Si content is preferably 0.01% or more. On the other hand, if added excessively, the temper softening resistance becomes high, the hardness of the weld zone and the HAZ becomes excessively high, and good joint strength cannot be obtained. Therefore, the upper limit of the Si content is preferably 3.00% or less, more preferably 2.00% or less, and still more preferably 1.00% or less.
  • Mn is an element that contributes to improving hardenability, and is an essential element for generating a hard structure such as martensite. Therefore, the lower limit of the Mn content is preferably 0.5% or more. On the other hand, if added excessively, the hardness of the weld zone and the HAZ becomes excessively high, and good joint strength cannot be obtained. Therefore, the upper limit of the Mn content is preferably 3.0% or less, more preferably 2.5% or less, and further preferably 2.0% or less.
  • P 0.05% or less (excluding 0%)
  • P is an element that is inevitably mixed into the steel, but it is easy to segregate within the grains and to the grain boundaries, and it is desirable to reduce it as much as possible because it lowers the toughness of the weld and HAZ. Therefore, the upper limit of the P content is preferably 0.05% or less, more preferably 0.04% or less, and still more preferably 0.02% or less.
  • S 0.05% or less (excluding 0%)
  • S is an element that is inevitably mixed into the steel, but is liable to segregate in the grains and to the grain boundaries, and lowers the toughness of the weld and HAZ. Therefore, the upper limit of the S content is preferably 0.05% or less, more preferably 0.04% or less, and still more preferably 0.02% or less.
  • the first member 11 and the second member 13 according to the present invention are other than the above C, Si, Mn, P and S, Al: 1.0% or less (including 0%), N: 0.01% or less (including 0%), 0.1% or less (including 0%) in total of Ti, V, Nb, and Zr, 1.0% or less (including 0%) in total of Cu, Ni, Cr, Mo and B,
  • the total of Mg, Ca, and REM is preferably 0.01% or less (including 0%).
  • the balance is preferably Fe and inevitable impurities. Inevitable impurities are impurities that are inevitably mixed during the production of steel, and may be contained within a range that does not impair the characteristics of the first member 11 and the second member 13.
  • 1st member 11 and 2nd member 13 should just be plate thickness which can be welded.
  • a bonded structure 100 having a thickness of 3 mm or less is used.
  • molding method of a high strength steel member For example, press molding, a roll form, etc. are employable.
  • the material of the insertion member 15 is not particularly limited as long as it is an iron-based material as described above.
  • a general structural rolled steel material or a carbon steel wire rod for forging can be used.
  • Appropriate methods, such as cutting and forging can be selected suitably.
  • a known coating usually applied to a steel material such as a metal plating film such as zinc or a zinc alloy, an organic resin film such as a paint, a lubricant, and / or a lubricating oil.
  • a known coating usually applied to a steel material such as a metal plating film such as zinc or a zinc alloy, an organic resin film such as a paint, a lubricant, and / or a lubricating oil.
  • These films may be a single layer used alone, or a multilayer formed by combining them.
  • the amount of component in steel of the insertion member 15 is not particularly limited, but the desirable range of the content of each element (C, Si, Mn, P, S and other metal elements) contained in the steel and limitation of the range. The reason will be explained below. In addition,% display of content of each element means the mass% altogether.
  • C is an element inevitably mixed into the steel, but since there is a limit to reducing it in the actual process, the lower limit of the C content is preferably 0.001% or more. On the other hand, if it is added excessively, the hardness of the welded portion becomes high and good joint strength cannot be obtained. Therefore, the upper limit of the C content is preferably 0.60% or less, more preferably 0.40% or less, and still more preferably 0.20%.
  • Si is an element contributing to deoxidation. Therefore, the lower limit of the Si content is preferably 0.01% or more. On the other hand, if added excessively, the temper softening resistance becomes high, the hardness of the weld becomes excessively high, and good joint strength cannot be obtained. Therefore, the upper limit of the Si content is preferably 3.00% or less, more preferably 2.00% or less, and still more preferably 1.00% or less.
  • Mn is an element effective for reducing S, which forms a compound with S and deteriorates joint strength. Therefore, the lower limit of the Mn content is preferably 0.1% or more. On the other hand, if added excessively, the hardness of the welded portion becomes excessively high and good joint strength cannot be obtained. Therefore, the upper limit of the Mn content is preferably 3.0% or less, more preferably 2.5% or less, and further preferably 2.0% or less.
  • P 0.05% or less (excluding 0%)
  • the upper limit of the P content is preferably 0.05% or less, more preferably 0.04% or less, and still more preferably 0.02% or less.
  • S 0.05% or less (excluding 0%)
  • S is an element that is inevitably mixed into the steel, but is liable to segregate in the grains and to the grain boundaries, and lowers the toughness of the weld. Therefore, the upper limit of the S content is preferably 0.05% or less, more preferably 0.04% or less, and still more preferably 0.02% or less.
  • the insertion member 15 except for the C, Si, Mn, P and S, Al: 1.0% or less (including 0%), N: 0.01% or less (including 0%), 0.1% or less (including 0%) in total of Ti, V, Nb, and Zr, 1.0% or less (including 0%) in total of Cu, Ni, Cr, Mo and B,
  • the total of Mg, Ca, and REM is preferably 0.01% or less (including 0%).
  • the balance is preferably Fe and inevitable impurities. Inevitable impurities are impurities that are inevitably mixed during the production of steel, and may be contained within a range that does not impair the various characteristics of the insertion member 15.
  • FIG. 2A is a state before the insertion member 15 is inserted
  • FIG. 2B is a state after the insertion member 15 is inserted
  • FIG. 2C is a joined structure after the insertion member 15 is inserted and joined. It is process drawing which shows each of these states.
  • the joined structure 100 is joined by the following procedure. First, as shown in FIG. 2A, the insertion member 15 and the second member 13 are arranged facing each other. As shown in FIG. 2B, the shaft portion 23 of the insertion member 15 is driven into the second member 13, and the insertion member 15 is inserted into the second member 13 and held. The second member 13 to which the insertion member 15 is fixed is overlapped with the first member 11, and the insertion member 15 and the first member 11 are sandwiched between a pair of spot welding electrodes (not shown), and a welding current is applied. The Then, as shown in FIG. 2C, a welded portion (molten nugget) 19 is formed between the insertion tip 23a of the shaft portion 23 of the insertion member 15 and the first member 11 facing the insertion tip 23a.
  • a welded portion (molten nugget) 19 is formed between the insertion tip 23a of the shaft portion 23 of the insertion member 15 and the first member 11 facing the insertion tip 23a.
  • the joint structure 100 uses the insertion member 15 having a carbon equivalent lower than that of the second member 13, so that the welded portion 19 between the first member 11 and the insertion member 15 is a steel of the first member 11.
  • the middle component is diluted, and the carbon equivalent of the welded portion 19 is lower than the carbon equivalent of the first member 11.
  • the welded portion 19 has a lower carbon equivalent than the case where the welded portion is formed between the first member 11 and the second member 13 described above, and is in a bonded state with excellent toughness and good peel strength.
  • the joining structure 100 can increase the thickness of the welded portion 19 because the insertion member 15 has the head portion 21. As a result, the joining structure 100 can obtain better joint strength.
  • the bonded structure 100 can obtain a bonded structure having excellent toughness and excellent joint strength. Moreover, according to the manufacturing method of the above-mentioned joining structure 100, it is only necessary to use a normal spot welding facility as it is, and welding of high strength steel members can be joined without complicated control of welding conditions. It can be done properly without reducing the strength.
  • FIG. 3A is a cross-sectional view of the insertion member 15 shown in FIG. 1
  • FIG. 3B is a cross-sectional view of the insertion member of the first modification.
  • the insertion member 15 shown in FIG. 3 (A) is formed with the shaft portion 23 protruding from the head portion 21. However, as shown in FIG. 3 (B), the connection of the shaft portion 23 of the head portion 21 is performed. It is good also as the insertion member 25 which formed the concentric circular groove
  • FIG. 4 is a process explanatory view schematically showing a process of fixing the insertion member 25 when the insertion member 25 of the first modification shown in FIG. 3 (B) is used.
  • the insertion member 25 having the annular groove 27 in the head 21 is press-fitted into the second member 13
  • the annular member 29 comes into contact with the opposite surface of the second member 13 on the side where the insertion member 25 is inserted.
  • a counter punch 31 is disposed. Then, the punch 32 is pressed against the head portion 21 of the insertion member 25, and the shaft portion 23 of the insertion member 25 is driven into the second member 13. Then, due to the shear between the shaft 23 and the counter punch 31, the portion 14 of the second member 13 corresponding to the shaft 23 of the insertion member 25 is punched out.
  • the insertion member 25 is pressed toward the second member 13 by the punch 32, a part of the second member 13 sandwiched between the head 21 and the counter punch 31 is attached to the shaft of the head 21. It is pushed into the annular groove 27 formed around the portion 23 by plastic flow. Thereby, the insertion member 25 is caulked and fixed to the second member 13.
  • a part of the second member 13 is plastically flowed and fixed in the annular groove 27 formed in the head portion 21. Therefore, the fixing strength between the insertion member 25 and the second member 13 is increased, and it is possible to prevent the insertion member 25 from rattling, dropping during transportation, and construction.
  • FIG. 5 is a cross-sectional view of the insertion member 35 of the second modified example in which the insertion tip of the shaft portion 23 is buckled and fixed to the second member 13.
  • the insertion member 35 having the head portion 21 and the shaft portion 23 has a configuration in which a plastic deformation portion 33 having a larger diameter than the shaft diameter of the shaft portion 23 is formed by buckling the insertion tip of the shaft portion 23. May be.
  • the insertion member 35 is fixed in a state where the second member 13 is sandwiched from the front and back by the head 21 and the plastic deformation portion 33. And the fixing strength of the second member 13 can be further increased. In addition, it is possible to more reliably prevent the insertion member 35 from rattling, dropping during transportation, and construction.
  • the above-described insertion members 15, 25, and 35 are all configured to have the head 21, but may be configured to have no head.
  • 6A to 6C are cross-sectional views of various insertion members having no head.
  • the insertion member 37 shown in FIG. 6A has a configuration of only a cylindrical shaft portion 23 in which the head portion 21 is omitted.
  • the insertion member 37 does not have the head 21 and the shaft diameter is constant from the head 21 to the insertion tip.
  • the insertion member 41 shown in FIG. 6B has a configuration in which a thread 39 is threaded on the outer periphery of the cylindrical shaft portion 23.
  • the insertion member 41 does not have the head portion 21, has a constant shaft diameter from one axial end portion to the other axial end portion, and a thread 39 is formed on the entire outer periphery of the shaft portion 23.
  • the thread 39 is not particularly limited in its type, number of threads, and formation range, and may be a non-standard thread.
  • the insertion member 43 shown in FIG. 6C has a configuration in which only one end side in the axial direction of the shaft portion 23 is expanded.
  • the insertion member 43 does not have the head portion 21 and has a larger diameter as the shaft portion 23 moves toward the insertion tip 43a.
  • FIG. 7 shows a state in which the insertion member 41 shown in FIG. 6B is fixed to the second member 13.
  • a part of the steel member of the second member 13 with respect to the thread 39 of the insertion member 41 is driven by the insertion member 41 being driven into the second member 13. Flows in plastically. Thereby, the insertion member 41 is caulked and fixed to the second member 13.
  • the insertion member 41 and the second member 13 are firmly fixed. Thereby, it can prevent reliably that the insertion member 41 falls off at the time of conveyance of a member, and joining, and it can also suppress that the insertion member 41 shakes.
  • each insertion member described above employs other fixing methods such as the above-described driving, fixing by a press such as press-fitting (inserting) into a prepared pilot hole, or caulking by rivet deformation during welding. You can also
  • each insertion member is not particularly limited with respect to the shaft diameter of the shaft portion.
  • the shaft diameter d of the shaft portion 23 is too small with respect to the diameter D of the welded portion 19, it is difficult to obtain a dilution effect at the time of melting. / 4, more preferably d / D ⁇ 1/2.
  • the axial length of the insertion member may be appropriately selected and determined according to the plate thickness of the high-tensile steel member.
  • the shaft diameter d of the shaft portion 23 of the insertion member 15 is less than a predetermined value compared to the plate thickness t 2 of the second member 13, that is, If the shaft diameter d is too small compared to the plate thickness t 2 of the second member 13, the insertion member 15 may buckle when the insertion member 15 is driven, and the second member 13 may not be punched.
  • the upper limit of the shaft diameter d is not particularly limited, but as specified in the JIS standard, since the target nugget diameter is determined by the plate thickness to be welded in spot welding, a good joint strength can be obtained. from the obtained point of view, as shown in FIG. 1, the thinner if the thickness was t min (member to be welded of the sheet thickness t 2 of the sheet thickness t 1 and the second member 13 of the first member 11 In the case of three or more sheets, it is preferable that the following expression (6) is satisfied with the smallest plate thickness among them. d ⁇ 7 ⁇ t min (6)
  • the Vickers hardness of the shaft portion 23 of the insertion member 15 is preferably 140 Hv or more.
  • the Vickers hardness of the shaft portion 23 in the present invention is measured from any three locations in the lower half region of the shaft length of the shaft portion 23 (the length of the shaft portion 23 in the vertical direction in FIG. 3A). It is calculated
  • the head diameter and the head thickness of the insertion member having the head 21 are not particularly limited.
  • the head diameter and head thickness may be selected and determined as appropriate from design conditions such as required strength and rigidity of application members such as automobile members and welding conditions during assembly.
  • the timing for inserting the insertion member into the second member is not particularly limited as long as it is before the welded portion between the insertion member and the first member is formed.
  • the insertion member may be inserted into the second member after the second member is formed into a shape for an automobile member by cold working.
  • the second member may be formed into a shape for an automobile member by, for example, hot stamping (hot pressing).
  • the welding part 19 is demonstrated.
  • the welded portion 19 can be formed by using a well-known welding method such as laser welding, plasma arc welding, or resistance welding in addition to spot welding.
  • the welding conditions may be appropriately selected and determined according to design conditions such as required strength and rigidity.
  • the welded portion 19 may be formed using a two-stage energization condition for changing the applied current value in two stages, a pulse energization condition for applying a pulse current, or the like. In this case, the amount of energy applied to the welded part 19 can be set with high accuracy, and the temperature, size, etc. of the welded part 19 can be set finely.
  • the present technology can use a mass production spot welding facility such as existing mild steel as it is, and does not require a special device or control for high-tensile steel. Moreover, it becomes possible to change easily the amount of components in steel of a welding part by selecting the material of an insertion member suitably. Furthermore, since the first member 11 and the second member 13 are fixed by spot welding between the insertion member and the first member 11, there are few restrictions on the material of the second member 13. Therefore, the degree of freedom in selecting the material for the second member 13 is increased.
  • FIG. 8 is a cross-sectional view showing another example of a welded portion formed in the joint structure.
  • the dotted line in a figure has shown the state before formation of the welding part 19.
  • the welded portion 19 is formed between the insertion tip 23 a of the shaft portion 23 of the insertion member 37 into the second member 13 and the mating surface 11 a of the shaft portion 23 of the first member 11.
  • the welded portion 19 is formed by melting a part of each of the first member 11, the insertion member 37, and the second member 13.
  • each welded portion 19 described above is not particularly limited, but if the Vickers hardness of the welded portion 19 is too high, the toughness is low and good peel strength cannot be obtained. For this reason, the Vickers hardness of the welded portion 19 is desirably 500 Hv or less, and more preferably 420 Hv or less.
  • FIG. 9 is a cross-sectional view of the joint structure 200 of the second configuration example in which the welded portion 19 is formed between the insertion tips of the first insertion member 15A and the second insertion member 15B.
  • the bonded structure 200 of this configuration includes a first member 11, a second member 13 superimposed on the first member 11, a first insertion member 15 ⁇ / b> A, a second insertion member 15 ⁇ / b> B, and a welded part 19. And having.
  • the first member 11 and the second member 13 may be composed of high-tensile steel members and may have a multilayer structure in which a plurality of members are further stacked.
  • 15A of 1st insertion members are from the surface 16 opposite to the overlapping surface 12 of the 1st member 11 and the 2nd member 13 of the 2nd member 13 in the overlap part of the 1st member 11 and the 2nd member 13. It is held by the second member 13 in a state of being inserted toward the overlapping surface 12.
  • the second insertion member 15 ⁇ / b> B is a surface 18 of the first member 11 opposite to the overlapping surface 12 of the first member 11 and the second member 13 in the overlapping portion of the first member 11 and the second member 13. Then, the first member 11 is held in a state of being inserted toward the overlapping surface 12. Thereby, the shaft portions 23 and 23 are inserted into the first member 11 and the second member 13, respectively.
  • the insertion tip of the first insertion member 15 ⁇ / b> A into the second member 13 in the shaft portion 23 and the insertion tip of the second insertion member 15 ⁇ / b> B into the first member 11 are melted. It is the joined part.
  • the welded portion 19 firmly joins the first insertion member 15A and the second insertion member 15B. Thereby, the 1st member 11 and the 2nd member 13 are clamped between the head 21 of the 1st insertion member 15A and the 2nd insertion member 15B, and are fixed.
  • the bonded structure 200 having the above configuration includes the carbon equivalent Ceq (M1) of the first member 11 defined by the above-described formula (1), the carbon equivalent Ceq (M2) of the second member 13, and the first insertion member 15A.
  • carbon equivalent Ceq (N1) and carbon equivalent Ceq (N2) of second insertion member 15B satisfy the following formula (4).
  • the welded portion 19 of the joint structure 200 is formed between the outer peripheral surface of the shaft portion 23 of the first insertion member 15 ⁇ / b> A and the second member 13, and between the second insertion member 15 ⁇ / b> B. At least a portion may be formed across the outer peripheral surface of the shaft portion 23 and the first member 11 and also on the mating surface of the first member 11 and the second member 13.
  • a welded portion having a carbon equivalent lower than that of the first member 11 and the second member 13 at the insertion tip of the first insertion member 15 ⁇ / b> A and the second insertion member 15 ⁇ / b> B. 19 is formed. Therefore, a bonded structure having excellent toughness and good peel strength can be obtained. In addition, a stronger joint structure can be obtained by sandwiching the first member 11 and the second member 13 between the head portions 21 of the first insertion member 15A and the second insertion member 15B.
  • At least one of the insertion members may be a high-strength member (for example, a high-strength steel member) having a high carbon equivalent.
  • the welded portion 19 is diluted by the other insertion member, and the carbon equivalent of the welded portion 19 is lower than the carbon equivalent of the first member 11 and the second member 13. Therefore, the toughness of the joined structure 200 is improved and the joint strength is improved.
  • the bonded structure 200 of this configuration can form the welded portion 19 having excellent toughness, and good peel strength can be obtained.
  • the first insertion member 15A and the second insertion member 15B each have the head portion 21, whereby the welded portion 19 can be increased in the plate thickness direction, and the joint strength can be increased. Further enhanced.
  • the second insertion member 15B is driven into the first member 11, and the first insertion member 15A is injected into the second member 13.
  • the shaft diameter d 1 of the shaft portion 23 of the first insertion member 15 ⁇ / b> A and the plate thickness t 2 of the second member 13 satisfy the following expression (7).
  • the shaft diameter d 2 of the shaft portion 23 of the second insertion member 15B and the plate thickness t 1 of the first member 11 it is preferable to satisfy the following expression (8).
  • FIG. 10A is a cross-sectional view of the bonded structure before bonding, in which the insertion member is inserted without penetrating the second member 13, and FIG. 10B is the first insertion member of FIG. 10A.
  • 3 is a cross-sectional view of a bonded structure that is melted and bonded to a member 11 and a second member 13.
  • the insertion member 37 is inserted halfway in the thickness direction of the second member 13 and held in this inserted state before bonding. Then, the second member 13 provided with the insertion member 37 is overlapped with the first member 11 to form the welded portion 19.
  • the insertion member 37 may or may not have a head.
  • the 2nd member 13 can be made into the structure without a protrusion in the plate
  • the carbon equivalent Ceq (N1) of the insertion member 37 is lower than the carbon equivalent Ceq (M2) of the second member 13. Therefore, the insertion member 37 dilutes the welded part 19 at the time of welding, and makes the carbon equivalent lower than the carbon equivalent of the first member 11 and the second member 13. Thereby, the welding part 19 excellent in joining toughness can be formed, and favorable joint strength is obtained.
  • the toughness of the welded portion can be increased without limiting the welding conditions only by making the carbon equivalent of the insertion member lower than that of the second member.
  • the joint strength can be improved.
  • the present invention is not limited to the above-described embodiments, and those skilled in the art can change or apply the configurations of the embodiments to each other, based on the description of the specification and well-known techniques. Is also within the scope of the present invention, which is intended to be protected.
  • any one of the steel plates A, B, or C shown in Table 1 is passed through the insertion member of ⁇ , ⁇ , or ⁇ shown in Table 2 using a press device, and caulked. Fixed. Note that penetration of the insertion member into the steel plate was performed in Examples 1 to 7, 9 and 11 shown in Table 3 by driving the insertion member into a steel plate having no through hole and punching out the steel plate. . Moreover, in Example 8 and Example 10, it carried out by inserting (pressing in) the insertion member which has a diameter below the diameter of a lower hole with respect to the steel plate in which the lower hole (through-hole) was provided previously.
  • the steel plate to which the insertion member is fixed and the steel plate to be mated are overlapped under the conditions shown in Table 3 based on the cross tension test method (JIS Z3137: hereinafter, description of the JIS standard of the cross tension test method is omitted). And welded to prepare a cross tensile test piece.
  • the insertion members ⁇ and ⁇ are SS400 materials (general structural rolled steel JIS G3101: 2004), and the insertion members ⁇ are SS330 materials (general structural rolled steel JIS G3101: 2004).
  • a shaft having a diameter of ⁇ 4 to 9 mm was used. Two types of insertion members, one having a head and one having no head, were used.
  • the shaft diameter of the insertion member was constant from the head side to the insertion tip.
  • spot welding was performed using a DC inverter type welding machine under the following one-stage energization conditions and two-stage energization conditions.
  • the cross tension test based on the above cross tension test method was performed on the joint obtained by spot welding, and the cross tensile strength (CTS) and fracture mode were investigated. Moreover, welding evaluation was implemented from the result of the cross tension test. In the welding evaluation, compared to the case where no insertion member is used, among the conditions in which the cross tensile strength is improved, the vicinity of the periphery of the molten nugget or part of the plug rupture that breaks in the nugget or in the base material is evaluated as I The other types of fracture such as partial plug fracture and interface fracture were rated as II.
  • Example 1 to 11 shown in Table 3 in Examples 1 to 5 and Examples 8 to 11, an insertion member having a head on the upper plate is caulked and fixed to a plate set of the same kind of materials, A welded portion was formed between the insertion tip of the insertion member and the lower plate.
  • Example 6 an insertion member without a head was caulked and fixed to the upper plate with respect to a plate set of similar materials, and a welded portion was formed between the insertion tip of the insertion member and the lower plate.
  • Example 7 an insertion member having a head on the upper plate was driven into a plate set of steel plates having different strengths, and a weld was formed between the insertion member and the lower plate.
  • Comparative Examples 1 to 4 welds were formed between members by a conventionally known spot welding method without using an insertion member.
  • Example 5 the cross tensile strength was improved by using the insertion member in any plate assembly and welding conditions. Further, in Examples 1, 2, 5, 6, 8, 9, and 11, plug rupture occurred, and the rupture form was improved. In Example 5, the cross tensile strength was further improved by using two-stage energization as compared with the one-stage energization condition.
  • Example 1 having the insertion member does not have the insertion member.
  • CTS cross tensile strength
  • Comparative Example 2 the CTS is changed from 5.4 kN to 7.2 kN
  • Example 6 and Comparative Example 1 the CTS is changed from 3.8 kN to 4.9 kN.
  • Comparative Example 3 it can be seen that CTS is improved from 5.4 kN to 5.6 kN, and in comparison between Example 10 and Comparative Example 4, CTS is improved from 1.2 kN to 1.5 kN.
  • the two plates of the middle plate and the lower plate are overlapped, and the upper plate is taken from the top of the two stacked plates.
  • the test piece was produced by crossing and overlapping.
  • welding evaluation was implemented from the result of the cross tension test.
  • the plug rupture is evaluated as I, and the other partial plug rupture, the fracture form in which the interface rupture occurs, etc. This was rated II.
  • Example 12 shown in Table 4, an insertion member having a head on the upper plate is caulked and fixed to a plate set of similar materials, and a welded portion is provided between the insertion member, the middle plate, and the lower plate. Formed.
  • Comparative Example 5 a welded portion was formed between the upper plate and the lower plate by a conventionally known spot welding method without using an insertion member.
  • a first member made of high-strength steel A second member overlaid on the first member and made of high strength steel; A steel insertion member held by the second member in a state where the second member is inserted from the opposite surface of the overlapping surface of the first member and the second member toward the overlapping surface; , A welding portion formed by melting the insertion member and the first member at an insertion tip of the insertion member;
  • the bonding structure has a carbon equivalent Ceq of the insertion member lower than a carbon equivalent Ceq of the second member.
  • the carbon equivalent Ceq is a value defined by the following formula (1).
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and 0 when not contained.)
  • the insertion member is welded to the first member by using the insertion member having a carbon equivalent Ceq lower than that of the second member.
  • the equivalent weight is reduced.
  • the welded portion has a lower carbon equivalent than when the welded portion is formed between the first and second members.
  • the toughness of the welded portion is increased, and an excellent bonded structure having a good joint strength is obtained.
  • the solid insertion member is held in the state of being inserted into the second member, an appropriate amount of the insertion member necessary for dilution is disposed in the welded portion. Thereby, dilution of a welding part can be performed efficiently irrespective of a welding attitude
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and when not contained, 0 is assumed.) Ceq (M1) + Ceq (M2) ⁇ Ceq (N1) + Ceq (N2) ⁇ (2)
  • the welded parts are carbonized by diluting the components in the steel by using the insertion members having a lower carbon equivalent Ceq than the first and second members and welding the insertion members together.
  • the equivalent weight is reduced.
  • the carbon equivalent of the welded portion is lower than when the welded portion is formed between the first and second members.
  • the toughness of the welded portion is increased, and an excellent bonded structure having a good joint strength is obtained.
  • the solid insertion member is held in the state of being inserted into the second member, an appropriate amount of the insertion member necessary for dilution is disposed in the welded portion. Thereby, dilution of a welding part can be performed efficiently irrespective of a welding attitude
  • the insertion member has a shaft portion and a head portion having a larger diameter than the shaft portion, One end of the shaft portion is the insertion tip, and the other end of the shaft portion is the joint structure according to (1) or (2) in which the head is formed.
  • the insertion member having the head portion and the shaft portion can partially increase the thickness of the insertion member connected to the welded portion by the thickness of the head portion.
  • the peel strength of the bonded structure can be increased, and the bond strength can be further improved.
  • the head portion and / or the shaft portion of the insertion member is caulked by a member into which the insertion member is inserted among the first member and the second member (3) or (4 ).
  • the fixing member is further caulked and fixed to the member into which the inserting member is inserted, whereby the fixing member is further increased in fixing strength, and rattling of the inserting member is also suppressed. it can.
  • the insertion member which is solid is inserted in the 2nd member, the insertion member of the appropriate volume required for dilution is arrange
  • the shaft diameter d of the shaft portion of the insertion member is the first member or the second member to be inserted. Since the thickness is equal to or greater than a predetermined value compared to the plate thickness t of the member, the insertion member can be prevented from buckling when the insertion member is driven, and the first member or the second member can be effectively punched out.
  • the manufacturing method of the joining structure which makes the carbon equivalent Ceq of the said insertion member lower than the carbon equivalent Ceq of the said 2nd member.
  • the carbon equivalent Ceq is a value defined by the following formula (1).
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and 0 when not contained.)
  • an insertion member having a carbon equivalent Ceq lower than that of the second member is used, and the insertion member is welded to the first member.
  • the carbon equivalent is reduced.
  • the carbon equivalent of the welded portion is lower than when the welded portion is formed between the first and second members.
  • the toughness of the welded portion is increased, and an excellent bonded structure having a good joint strength is obtained.
  • the solid insertion member is held in the state of being inserted into the second member, an appropriate amount of the insertion member necessary for dilution is disposed in the welded portion. Thereby, dilution of a welding part can be performed efficiently irrespective of a welding attitude
  • Ceq C + Si / 30 + Mn / 20 + 2P + 4S (1) (C, Si, Mn, P, and S represent the content (% by mass) of each element, and when not contained, 0 is assumed.) Ceq (M1) + Ceq (M2) ⁇ Ceq (N1) + Ceq (N2) ⁇ (2)
  • the welded parts are diluted in steel components by using the insertion members having a carbon equivalent Ceq lower than that of the first and second members and welding the insertion members to each other.
  • the carbon equivalent is reduced.
  • the carbon equivalent of the welded portion is lower than when the welded portion is formed between the first and second members.
  • the toughness of the welded portion is increased, and an excellent bonded structure having a good joint strength is obtained.
  • the solid insertion member is held in the state of being inserted into the second member, an appropriate amount of the insertion member necessary for dilution is disposed in the welded portion. Thereby, dilution of a welding part can be performed efficiently irrespective of a welding attitude
  • the insertion member has a shaft portion and a head portion having a larger diameter than the shaft portion, and the insertion member is welded to the first member while leaving the head portion on the surface of the second member.
  • the second member is welded between the first member and the head by welding the first member leaving the head of the insertion member on the surface of the second member. It can be fixed in a sandwiched state. Thereby, the joint strength of the joint structure can be increased, and the joint strength can be further improved.
  • the insertion member has a shaft portion and a head portion having a diameter larger than that of the shaft portion, and the insertion members are connected to each other while leaving the head portions on the surfaces of the first member and the second member.
  • the first member and the second member are welded together by leaving the heads of the insertion members on the surfaces of the first member and the second member, It can be fixed in a state of being sandwiched between a pair of heads.
  • the joint strength of the joint structure can be increased, and the joint strength can be further improved.
  • the shaft portion of the insertion member is disposed through the member into which the insertion member is inserted, the insertion member can be easily inserted by processing such as driving. .
  • the head of the insertion member is caulked to the member into which the insertion member is inserted among the first member and the second member.
  • the fixing member is caulked and fixed to the member into which the inserting member is inserted, so that the fixing member is further increased in fixing strength, and the inserting member has a backlash. It is also possible to suppress the sticking. Moreover, since the insertion member which is solid is inserted in the 2nd member, the insertion member of the appropriate volume required for dilution is arrange
  • the step of inserting and holding the insertion member into the first member or the second member is to hold the insertion member by driving the insertion member into the first member or the second member.
  • the joint structure according to any one of (10) to (13), wherein the shaft diameter d of the shaft portion and the plate thickness t of the member into which the insertion member is inserted satisfy the following expression (3): Manufacturing method. d ⁇ 3.3 t (3)
  • the shaft diameter d of the shaft portion of the insertion member is inserted into the first member. Since the thickness is equal to or greater than the predetermined thickness t of the member or the second member, the insertion member can be prevented from buckling when the insertion member is driven, and the first member or the second member is effectively punched out. be able to.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

Structure de jonction (100) comportant : un premier élément (11) formé à partir d'acier à haute résistance à la traction ; un second élément (13) formé à partir d'acier à haute résistance à la traction et empilé sur le premier élément (11) ; un élément d'introduction en acier (15) maintenu dans un état introduit à partir d'une surface du second élément (13) opposée à la surface sur laquelle le premier élément (11) et le second élément (13) sont empilés vers cette surface ; et une partie de soudage (19) formée sur la pointe d'introduction de l'élément d'introduction (15) par l'élément d'introduction (15) et le premier élément (11) qui ont fusionné. L'équivalent carbone Ceq (N1) de l'élément d'introduction est inférieur à l'équivalent carbone Ceq (M2) du second élément. Ici, l'équivalent carbone Ceq est défini par Ceq = C + Si/30 + Mn/20 + 2P + 4S (C, Si, Mn, P et S représentant la teneur (en pour cent par masse) d'éléments respectifs, 0 signifiant pas de contenu). Grâce à cette structure de jonction (100), on peut obtenir une excellente résistance de jonction sans établir de limites pour les composants en acier et l'aptitude au façonnage.
PCT/JP2017/017578 2016-05-20 2017-05-09 Structure de jonction et procédé de fabrication de structure de jonction Ceased WO2017199796A1 (fr)

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EP17799221.1A EP3459671A1 (fr) 2016-05-20 2017-05-09 Structure de jonction et procédé de fabrication de structure de jonction
US16/302,853 US20190291202A1 (en) 2016-05-20 2017-05-09 Joining structure and method for manufacturing joining structure
CN201780030949.8A CN109311116A (zh) 2016-05-20 2017-05-09 接合结构体及接合结构体的制造方法

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JP2016101294 2016-05-20
JP2017074691A JP2017209725A (ja) 2016-05-20 2017-04-04 接合構造体及び接合構造体の製造方法
JP2017-074691 2017-04-04

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617145A (en) * 1979-07-23 1981-02-18 Wako Denshi Kk Rivet sticking method
JP2002219576A (ja) * 2000-11-22 2002-08-06 Nippon Steel Corp 溶接部の疲労強度特性に優れた高強度鋼板のスポット溶接方法
JP2007521964A (ja) * 2004-01-27 2007-08-09 アダム オペル アクチエンゲゼルシャフト １つ又は複数の接続点で機械的に接合するとともに加圧溶接することによって、２つ以上の、形状部品又は金属板を接合する方法
WO2011013793A1 (fr) 2009-07-31 2011-02-03 高周波熱錬株式会社 Élément de construction soudé et procédé de soudage
JP2012167338A (ja) 2011-02-15 2012-09-06 Nippon Steel Corp 引張強度９８０ＭＰａ以上のスポット溶接用高強度鋼板
JP2013010139A (ja) 2011-05-27 2013-01-17 Nippon Steel & Sumitomo Metal Corp 継手強度に優れたアークスポット溶接継手およびその製造方法
JP2014000580A (ja) * 2012-06-18 2014-01-09 Kobe Steel Ltd 異材接合体、異材接合体用構造体、及び、異材接合体用リベット
WO2015117059A1 (fr) * 2014-02-03 2015-08-06 Alcoa Inc. Élément de fixation à soudage par résistance, appareil et procédés

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617145A (en) * 1979-07-23 1981-02-18 Wako Denshi Kk Rivet sticking method
JP2002219576A (ja) * 2000-11-22 2002-08-06 Nippon Steel Corp 溶接部の疲労強度特性に優れた高強度鋼板のスポット溶接方法
JP2007521964A (ja) * 2004-01-27 2007-08-09 アダム オペル アクチエンゲゼルシャフト １つ又は複数の接続点で機械的に接合するとともに加圧溶接することによって、２つ以上の、形状部品又は金属板を接合する方法
WO2011013793A1 (fr) 2009-07-31 2011-02-03 高周波熱錬株式会社 Élément de construction soudé et procédé de soudage
JP2012167338A (ja) 2011-02-15 2012-09-06 Nippon Steel Corp 引張強度９８０ＭＰａ以上のスポット溶接用高強度鋼板
JP2013010139A (ja) 2011-05-27 2013-01-17 Nippon Steel & Sumitomo Metal Corp 継手強度に優れたアークスポット溶接継手およびその製造方法
JP2014000580A (ja) * 2012-06-18 2014-01-09 Kobe Steel Ltd 異材接合体、異材接合体用構造体、及び、異材接合体用リベット
WO2015117059A1 (fr) * 2014-02-03 2015-08-06 Alcoa Inc. Élément de fixation à soudage par résistance, appareil et procédés

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