WO2015019698A1 - 付加溶接用フラックス入りワイヤ及び溶接方法 - Google Patents
付加溶接用フラックス入りワイヤ及び溶接方法 Download PDFInfo
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- WO2015019698A1 WO2015019698A1 PCT/JP2014/065251 JP2014065251W WO2015019698A1 WO 2015019698 A1 WO2015019698 A1 WO 2015019698A1 JP 2014065251 W JP2014065251 W JP 2014065251W WO 2015019698 A1 WO2015019698 A1 WO 2015019698A1
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes or wires
- B23K35/0266—Rods, electrodes or wires flux-cored
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Definitions
- the present invention relates to a flux-cored wire for additional welding used for additional welding to the weld metal toe of main welding and a welding method. More specifically, the present invention relates to a flux-cored wire for additional welding having a structure in which a steel outer shell is filled with flux and a welding method for performing additional welding using this wire.
- additional beads may be formed at the weld toe of the main weld for the purpose of improving the fatigue strength of welded joints or reducing residual stress (see Patent Documents 1 to 3).
- a welding material used for welding additional welding
- a material having a composition similar to that of main welding is generally used.
- Patent Document 1 discloses that a weld metal having a Ni content of 4 to 12% by mass and a Cr content of 7 to 15% by mass is formed by additional welding.
- Patent Document 2 the content of C, Cr, Ni, Si, Mn, Mo, and Nb is specified for the weld metal formed by additional welding, and the amount of Ni and Cr is increased. Therefore, the martensite transformation start temperature is set to 120 to 400 ° C. Further, Patent Document 3 contains C: 0.20 mass% or less, Cr: 5.0-18.0 mass%, Ni: 3.0-15.0 mass% for additional welding, and the balance A welding material having a composition consisting of Fe and inevitable impurities has been proposed.
- the main object of the present invention is to provide a flux-cored wire and a welding method capable of improving the fatigue strength of the welded portion while maintaining good crack resistance of the weld metal in addition welding. .
- the present inventor has conducted extensive experiments to solve the above-described problems.
- the welding material with an increased Mn content can reduce the added amount of Cr and Ni, and in addition welding, it can achieve improved fatigue strength of the weld while ensuring the crack resistance and toughness of the weld metal.
- the headline, the present invention has been reached.
- the flux-cored wire for additional welding is a flux-cored wire in which a steel outer sheath is filled with flux, and Si: 0.2 to 1.0 mass%, Mn: 3.0 to 10.0% by mass, C: 0.1% by mass or less, P: 0.03% by mass or less, S: 0.03% by mass or less, Cr and / or Ni: 3 in total It has a composition restricted to .8% by mass or less, and is used for additional welding to the weld metal toe portion of main welding.
- the flux-cored wire of the present invention may have Ni: 0.5 to 3.8% by mass and Mn: 3 to 7% by mass based on the total mass of the wire.
- the flux-cored wire of the present invention may further contain Al: 0.1 to 0.5% by mass with respect to the total mass of the wire.
- the welding method according to the present invention uses the above-described flux-cored wire for additional welding, and contains at least Mn: 0.5 to 2.0 mass%, Ni: 3.5 mass% or less (excluding 0). Additional welding is performed on the weld metal toe of the main weld made of steel.
- the additional welding in the welding method of the present invention can be performed, for example, by gas shielded arc welding using a shielding gas containing 10% by volume or more of CO 2 .
- the fatigue strength of the welded portion is maintained while maintaining good crack resistance of the weld metal in addition welding without adding a large amount of Ni or Cr. Can be improved.
- the flux-cored wire of this embodiment is a steel outer shell filled with flux, and Si is 0.2 to 1.0 mass% and Mn is 3.0 to 10.0 mass% with respect to the total mass of the wire. contains. At the same time, C is controlled to 0.1 mass% or less, P is 0.03 mass% or less, S is 0.03 mass% or less, and Cr and / or Ni are regulated to 3.8 mass% or less in total. Moreover, in addition to each component mentioned above, specific amount of Al can also be added to the flux cored wire of this embodiment.
- the outer diameter of the flux-cored wire of the present embodiment is not particularly limited, but is, for example, 0.9 to 1.6 mm.
- the flux filling rate can be set to any value as long as each component in the wire is within the above-mentioned range, but from the viewpoint of wire drawability and workability (feedability, etc.) during welding. Therefore, the content is preferably 8 to 25% by mass based on the total mass of the wire.
- Si 0.2 to 1.0% by mass
- Si has the effect of increasing the strength of the weld metal and reducing the stress concentration by smoothing the toe shape of the bead.
- Si content is less than 0.2% by mass, these effects are insufficient.
- Si content exceeds 1.0% by mass, grain boundary segregation occurs and high temperature cracking is likely to occur. Therefore, the Si content is 0.2 to 1.0% by mass with respect to the total mass of the wire.
- Si source in the flux-cored wire of the present embodiment include Si contained in the steel outer sheath, Fe—Si, Fe—Si—Mn, Fe—Si—Mg, REM— contained in the flux.
- Si contained in the steel outer sheath
- examples thereof include Ca—Si, Fe—Si—B, SiO 2 , ZrSiO 3 , K 2 SiF 6, and MgSiO 3 .
- Mn has the effect of enhancing the hardenability, lowering the martensitic transformation start temperature (Ms point) of the weld metal, and applying compressive residual stress to the weld metal toe.
- Mn has an effect of suppressing hot cracking by fixing an appropriate amount of S, which affects hot cracking resistance of the weld metal, as MnS.
- Mn content is less than 3% by mass, these effects are insufficient, and when the Mn content exceeds 10% by mass, the weld metal is excessively cured, and hot cracking is likely to occur. Toughness also decreases. Therefore, the Mn content is 3 to 10% by mass with respect to the total mass of the wire.
- Mn source in the flux-cored wire of the present embodiment include Mn contained in the steel outer sheath, Fe—Mn, Si—Mn, MnO 2 contained in the flux, and the like.
- C 0.1% by mass or less
- C has the effect of improving the strength of the weld metal and increasing the hardenability and lowering the Ms point of the weld metal, but is also an element that easily induces hot cracking. Specifically, when the C content exceeds 0.1% by mass, hot cracking is likely to occur in the weld metal. Therefore, the C content is regulated to 0.1% by mass or less per the total mass of the wire.
- P 0.03 mass% or less
- P is also an element that easily induces hot cracking.
- the P content exceeds 0.03% by mass, hot cracking is likely to occur in the weld metal. Therefore, the P content is regulated to 0.03% by mass or less per the total mass of the wire.
- S 0.03 mass% or less
- S is also an element that easily induces hot cracking as with P described above.
- S content exceeds 0.03% by mass, hot cracking is likely to occur in the weld metal. Therefore, the S content is also regulated to 0.03% by mass or less per total mass of the wire.
- Cr and Ni 3.8% by mass or less in total
- Cr has the effect of lowering the Ms point of the weld metal and improving the fatigue strength of the weld.
- an iron alloy containing Cr forms a harder weld metal
- the weld metal It hardens excessively and causes a decrease in crack resistance and toughness.
- Ni also has the effect of lowering the Ms point of the weld metal, and by adding an appropriate amount, the fatigue strength of the welded portion can be further improved, but when added in a large amount, the crack resistance of the weld metal and Toughness decreases.
- the total content of Cr and Ni exceeds 3.8% by mass with respect to the total mass of the wire, the crack resistance and toughness of the weld metal are lowered, and the desired characteristics cannot be obtained. Therefore, in the flux-cored wire of the present embodiment, when Cr and / or Ni is added, the total content is made 3.8% by mass or less.
- Cr and Ni may contain both of them within the above-described range, but may contain either one or both.
- the Ni content is preferably 0.5 to 3.8% by mass and the Mn content is preferably 3 to 7% by mass.
- the relationship between the Mn content and the Ni content satisfies the following formula 2.
- [Mn] in the following formula 2 is the amount of Mn (mass%) per the total mass of the wire
- [Ni] is the amount of Ni (mass%) per the total mass of the wire.
- the sum of the Mn content and the 1 ⁇ 2 amount of the Ni content is within the range of more than 3 and less than 6, while sufficiently ensuring the toughness of the weld metal, A weld metal having excellent hot cracking resistance can be obtained even in current and high-speed welding.
- Al 0.1 to 0.5% by mass
- Al has the effect of making the slag generated on the bead surface uniform, but it slightly increases the Ms point of the weld metal, so it is added as necessary in the flux-cored wire of this embodiment.
- the Al content is less than 0.1% by mass, the above-described addition effect cannot be obtained, and if the Al content exceeds 0.5% by mass, the toughness of the weld metal deteriorates, This causes a reduction in fatigue strength of the weld due to an increase in Ms point. Therefore, when Al is added, the content is 0.1 to 0.5% by mass with respect to the total mass of the wire. Thereby, uniform slag can be formed over the entire surface of the weld bead.
- the remainder in the component composition of the flux-cored wire of this embodiment is Fe and inevitable impurities.
- Examples of inevitable impurities in the flux-cored wire of this embodiment include Nb and V.
- O and N are also contained in the remainder of the flux cored wire of this embodiment.
- Mo, Ti, Zr, Mg, K, Ca, Na, and F may be added to the flux-cored wire of the present embodiment in addition to the components described above.
- the flux cored wire of this embodiment is used for additional welding to the weld metal toe of main welding.
- the weld metal composition of the main weld portion is not particularly limited, but the flux-cored wire of the present embodiment has a weld metal of the main weld portion of Mn: 0.5 to 2.0 mass%, This is particularly suitable when the steel contains at least Ni: 3.5% by mass or less (excluding 0).
- Mn content and the Ni content are in this range, it is possible to suppress a reduction in the effect due to dilution of the base material and to form a welded joint having excellent crack resistance and fatigue strength.
- the fatigue strength may be insufficient.
- the Mn content of the weld metal in the main weld exceeds 2.0% by mass, the crack resistance may be lowered.
- the weld metal of the main weld part exceeds 3.5 mass% and contains Ni, the crack resistance of a weld metal may fall, and also manufacturing cost will increase.
- the conditions for additional welding are not particularly limited, gas shield arc welding is usually used.
- the shielding gas preferably contains a CO 2 or 10 vol%, it is more preferable to use 100% CO 2 gas. The occurrence of poor fusion can be suppressed by using a shielding gas containing CO 2 .
- the flux-cored wire of the present embodiment has an increased amount of Mn as compared with the conventional case. Therefore, even if the content of Ni or Cr is reduced, the crack resistance of the weld metal in addition welding is reduced. The fatigue strength of the welded portion can be improved while maintaining good.
- FIG. 1 is a perspective view showing a double-sided fillet weld joint used for evaluation.
- flux was filled in the outer skin made of steel having the composition shown in Table 1 below, and flux-cored wires of Examples and Comparative Examples were produced.
- the diameter of the wire was 1.2 mm, and the flux filling rate was in the range of 12 to 18% by mass with respect to the total mass of the wire.
- FIG. 2 is a side view showing a fatigue test method.
- the fatigue strength was evaluated by cutting out the test piece 10 shown in FIG. 2 from the both-side fillet welded joint shown in FIG. 1 and conducting a partial piece swing three-point bending fatigue test.
- a 200 kN fatigue tester (PA24901) manufactured by Takes Group Co., Ltd. was used, and the test conditions were environmental temperature: room temperature, distance between fulcrums 11: 150 mm, load control with sine wave, frequency: 15 Hz, stress Ratio: 0.1 (partial swing).
- the arrow x shown in FIG. 2 shows a load application direction.
- the number of repetitions was 500,000 times, and the time strength was measured as fatigue strength.
- the fatigue strength of 300 MPa or more was evaluated as ⁇ (excellent), 250 MPa or more and less than 300 MPa as ⁇ (good), and less than 250 MPa as x (impossible).
- ⁇ Crack resistance> The crack resistance of the weld metal was evaluated based on the results of a C-type constrained cracking test based on JIS Z3155. At that time, the welding current was 280 A, and the welding speed was 40, 50, 70 cm / min. Then, after welding, an X-ray transmission test was performed, and x (impossible) the case where cracks occurred even at 40 cm / min, ⁇ (possible) those where no cracks occurred only at 40 cm / min, and 50 cm / min or less. Evaluations were made with ⁇ (good) indicating no cracking at the speed and ⁇ (excellent) indicating no cracking even at 70 cm / min.
- ⁇ Toughness> The toughness of all weld metals was evaluated based on the results of impact performance tests of all weld metals at 0 ° C. based on JIS Z3111.
- the impact performance at 0 ° C. was 60 J or more, and ⁇ (excellent), and 47 J or more and less than 60 J was rated ⁇ (good).
- the mechanical performance of a welded joint part is normally ensured by the main welded part, the additional welded part is not required to perform as well as the main welded part. Therefore, in this example, even if the impact performance at 0 ° C. is less than 47 J, it can be practically applied if it is 10 J or more.
- the impact performance at 0 ° C. is less than 10 J, the weld metal is excessively cured, and cracking may occur during press correction, and therefore, ⁇ (impossible).
- the remainder in the wire composition of additional welding shown in the following Table 3 and Table 4 is Fe and inevitable impurities.
- Cr and Ni are often present as unavoidable impurities in the steel shell.
- the comparative example No. In No. 39 Cr was 0.07% by mass. 21 and 22 contain 0.03% by mass of Ni, but these are added as impurities and are not positively added.
- the Cr content and the Ni content of the additional welding wires shown in Tables 3 and 4 include those added as inevitable impurities.
- No. 34 was inferior in fatigue strength of the weld.
- No. 35 was inferior in crack resistance of the weld metal.
- Example No. using the flux-cored wire produced within the scope of the present invention For Nos. 1 to 29, good results were obtained in all evaluations of slag tension, fatigue strength of welds, toughness of weld metal, and crack resistance.
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Abstract
Description
また、ワイヤ全質量あたりのMn量(質量%)を[Mn]、Ni量(質量%)を[Ni]としたとき、下記数式1を満たす組成にすることもできる。
一方、Cr含有量は、ワイヤ全質量あたり、1.0質量%以下としてもよい。
本発明のフラックス入りワイヤは、更に、ワイヤ全質量あたり、Al:0.1~0.5質量%を含有していてもよい。
本発明の溶接方法における付加溶接は、例えば、CO2 を10体積%以上含有するシールドガスを用いたガスシールドアーク溶接により行うことができる。
本実施形態のフラックス入りワイヤは、鋼製外皮にフラックスを充填したものであり、ワイヤ全質量あたり、Siを0.2~1.0質量%、Mnを3.0~10.0質量%を含有する。それと共に、Cを0.1質量%以下、Pを0.03質量%以下、Sを0.03質量%以下、Cr及び/又はNiを合計で3.8質量%以下に規制している。また、本実施形態のフラックス入りワイヤには、前述した各成分に加えて、Alを特定量添加することもできる。
Siは、溶接金属の強度を高めると共に、ビードの止端形状を滑らかにして応力集中を低減する効果がある。ただし、Si含有量が0.2質量%未満の場合、これらの効果が不十分となる。一方、Si含有量が1.0質量%を超えると、粒界偏析が生じて高温割れが発生しやすくなる。よって、Si含有量は、ワイヤ全質量あたり、0.2~1.0質量%とする。
Mnは、焼き入れ性を高め、溶接金属のマルテンサイト変態開始温度(Ms点)を低下させ、溶接金属止端部に圧縮残留応力を付与する効果がある。また、Mnは、適量の添加により、溶接金属の耐高温割れ性に影響を及ぼすSをMnSとして固定し、高温割れを抑制する効果もある。ただし、Mn含有量が3質量%未満の場合、これらの効果が不十分となり、また、Mn含有量が10質量%を超えると、溶接金属が過度に硬化し、高温割れが発生しやすくなると共に靭性も低下する。よって、Mn含有量は、ワイヤ全質量あたり、3~10質量%とする。
Cは、溶接金属の強度を向上させると共に、焼き入れ性を高めて溶接金属のMs点を低下させる効果があるが、高温割れを誘起しやすい元素でもある。具体的には、C含有量が0.1質量%を超えると、溶接金属に高温割れが発生しやすくなる。よって、C含有量は、ワイヤ全質量あたり、0.1質量%以下に規制する。
Pも、高温割れを誘起しやすい元素であり、P含有量が0.03質量%を超えると、溶接金属に高温割れが発生しやすくなる。よって、P含有量は、ワイヤ全質量あたり、0.03質量%以下に規制する。
Sも、前述したPと同様に高温割れを誘起しやすい元素であり、S含有量が0.03質量%を超えると、溶接金属に高温割れが発生しやすくなる。よって、S含有量も、ワイヤ全質量あたり、0.03質量%以下に規制する。
Crは、溶接金属のMs点を低下させ、溶接部の疲労強度を向上させる効果があるが、Crを含む鉄合金はより硬い溶接金属を形成するため、Crを多量に添加すると、溶接金属が過度に硬化して耐割れ性や靭性の低下を招く。同様に、Niも、溶接金属のMs点を低下させる効果があり、適量添加することにより、溶接部の疲労強度を更に向上させることができるが、多量に添加すると、溶接金属の耐割れ性及び靭性が低下する。
Alは、ビード表面に生成するスラグを均一化する効果があるが、溶接金属のMs点をわずかではあるが上昇させるため、本実施形態のフラックス入りワイヤでは、必要に応じて添加する。その際、Al含有量が0.1質量%未満であると、前述した添加効果が得られず、また、Al含有量が0.5質量%を超えると、溶接金属の靭性が劣化すると共に、Ms点上昇による溶接部の疲労強度低下を招く。よって、Alを添加する場合は、ワイヤ全質量あたり、0.1~0.5質量%とする。これにより、溶接ビードの表面全面に亘り均一なスラグを形成することができる。
本実施形態のフラックス入りワイヤの成分組成における残部は、Fe及び不可避的不純物である。本実施形態のフラックス入りワイヤにおける不可避的不純物としては、Nb及びVなどが挙げられる。また、前述した各元素が酸化物や窒化物として添加された場合は、本実施形態のフラックス入りワイヤの残部には、OやNも含まれる。更に、本実施形態のフラックス入りワイヤには、前述した各成分の他に、Mo、Ti、Zr、Mg、K、Ca,Na及びFなどが添加されていてもよい。
本実施形態のフラックス入りワイヤは、主溶接の溶接金属止端部への付加溶接に用いられる。その際、主溶接部の溶接金属組成は、特に限定されるものではないが、本実施形態のフラックス入りワイヤは、主溶接部の溶接金属が、Mn:0.5~2.0質量%、Ni:3.5質量%以下(0は含まない)を少なくとも含有する鋼である場合に、特に好適である。Mn含有量及びNi含有量がこの範囲にあれば、母材希釈による効果の低減を抑制し、耐割れ性及び疲労強度に優れた溶接継手を形成することができる。
作製された各継手について、付加溶接の溶接金属4表面のスラグの状態を、目視により観察した。その結果、付加溶接の溶接金属4表面の色が均一であったものを◎、まだらであったものを○とした。
図2は疲労試験の方法を示す側面図である。疲労強度は、図1に示す両側すみ肉溶接継手から、図2に示す試験片10を切り出し、部分片振り3点曲げ疲労試験を行って評価した。その際、株式会社テークスグループ製 200kN疲労試験機(PA24901)を使用し、試験条件は、環境温度:室温、支点11間の距離:150mm、正弦波で荷重制御を行い、周波数:15Hz、応力比:0.1(部分片振り)とした。なお、図2に示す矢印xは、荷重印加方向を示す。
溶接金属の耐割れ性は、JIS Z3155に基づいて、C型拘束割れ試験を行い、その結果により評価した。その際、溶接電流を280A、溶接速度を40,50,70cm/分とした。そして、溶接後に、X線透過試験を行い、40cm/分においても割れが生じていたものを×(不可)、40cm/分にのみ割れがなかったものを△(可)、50cm/分以下の速度で割れが生じていなかったものを○(良)、70cm/分においても割れが生じていなかったものを◎(優)として、評価した。
全溶着金属の靭性は、JIS Z3111に基づいて、0℃における全溶着金属の衝撃性能試験を行い、その結果により評価した。そして、0℃における衝撃性能が60J以上のものを◎(優)、47J以上60J未満を○(良)とした。また、通常、溶接継手部の機械性能は、主溶接部により担保されるため、付加溶接部には主溶接部ほどの性能は要求されない。そこで、本実施例では、0℃における衝撃性能が47J未満であっても、10J以上であれば実用上適用可能であるため、10J以上47J未満のものを△(可)とした。一方、0℃における衝撃性能が10J未満のものについては、溶接金属が過度に硬化し、プレス矯正時に割れが発生する可能性があるため×(不可)とした。
3 主溶接による溶接金属
4 付加溶接による溶接金属
10 試料片
11 支点
x 荷重印加方向
Claims (7)
- 鋼製外皮内にフラックスが充填されたフラックス入りワイヤであって、
ワイヤ全質量あたり、
Si:0.2~1.0質量%、
Mn:3~10質量%
を含有すると共に、
C:0.1質量%以下、
P:0.03質量%以下、
S:0.03質量%以下、
Cr及び/又はNi:合計で3.8質量%以下、
に規制され、
主溶接の溶接金属止端部への付加溶接に用いられる付加溶接用フラックス入りワイヤ。 - ワイヤ全質量あたり、
Ni:0.5~3.8質量%、
Mn:3~7質量%
である請求項1に記載の付加溶接用フラックス入りワイヤ。 - Cr含有量が、ワイヤ全質量あたり、1.0質量%以下である請求項1に記載の付加溶接用フラックス入りワイヤ。
- 更に、ワイヤ全質量あたり、Al:0.1~0.5質量%を含有する請求項1に記載の付加溶接用フラックス入りワイヤ。
- 請求項1~5のいずれか1項に記載の付加溶接用フラックス入りワイヤを使用し、
Mn:0.5~2.0質量%、Ni:3.5質量%以下(0は含まない)を少なくとも含有する鋼からなる主溶接の溶接金属止端部に、付加溶接を行う溶接方法。 - 前記付加溶接は、CO2 を10体積%以上含有するシールドガスを用いたガスシールドアーク溶接である請求項6に記載の溶接方法。
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| EP14834592.9A EP3031568A4 (en) | 2013-08-07 | 2014-06-09 | Flux-cored wire for additional welding, and welding method |
| KR1020167003205A KR101823798B1 (ko) | 2013-08-07 | 2014-06-09 | 부가 용접용 플럭스 코어드 와이어 및 용접 방법 |
| CN201480042456.2A CN105408053B (zh) | 2013-08-07 | 2014-06-09 | 附加焊接用药芯焊丝和焊接方法 |
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| JP2013164606A JP6061809B2 (ja) | 2013-08-07 | 2013-08-07 | 付加溶接用フラックス入りワイヤ及び溶接方法 |
| JP2013-164606 | 2013-08-07 |
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| JP6740805B2 (ja) * | 2016-08-23 | 2020-08-19 | 国立大学法人大阪大学 | 溶接方法、溶接継手の製造方法および溶接継手 |
| US11426824B2 (en) * | 2017-09-29 | 2022-08-30 | Lincoln Global, Inc. | Aluminum-containing welding electrode |
| US11529697B2 (en) | 2017-09-29 | 2022-12-20 | Lincoln Global, Inc. | Additive manufacturing using aluminum-containing wire |
| JP7606071B2 (ja) * | 2020-10-07 | 2024-12-25 | 日本製鉄株式会社 | 溶接継手の製造方法及び開先充填用のフラックス入りカットワイヤ |
| CN115106673B (zh) * | 2021-03-22 | 2023-11-14 | 宝山钢铁股份有限公司 | 高强管线钢单面焊双面成型焊接性评估方法 |
| CN115609175B (zh) * | 2021-07-13 | 2026-03-17 | 宝山钢铁股份有限公司 | 焊接接头疲劳行为评价方法 |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003251489A (ja) | 2002-02-27 | 2003-09-09 | Jfe Steel Kk | 低合金鉄鋼材料の溶接継手及びその溶接方法 |
| JP2003275890A (ja) | 2002-03-18 | 2003-09-30 | Nippon Steel Corp | 疲労寿命向上処理方法およびそれによる長寿命溶接継手 |
| JP2004042133A (ja) | 2002-05-15 | 2004-02-12 | Jfe Steel Kk | 耐応力腐食割れ性に優れた溶接継手およびその製造方法 |
| JP2012115877A (ja) * | 2010-12-01 | 2012-06-21 | Kobe Steel Ltd | フラックス入りワイヤ |
| JP2013018012A (ja) * | 2011-07-08 | 2013-01-31 | Nippon Steel & Sumitomo Metal Corp | 高張力鋼ガスシールドアーク溶接用フラックス入りワイヤ |
| JP2013091082A (ja) * | 2011-10-26 | 2013-05-16 | Nippon Steel & Sumikin Welding Co Ltd | 低温用鋼のサブマージアーク溶接方法 |
| JP2013173179A (ja) * | 2012-02-27 | 2013-09-05 | Kobe Steel Ltd | 耐水素脆化感受性に優れた溶接金属 |
| JP2013226577A (ja) * | 2012-04-25 | 2013-11-07 | Nippon Steel & Sumikin Welding Co Ltd | 原油油槽鋼のガスシールドアーク溶接用フラックス入りワイヤ |
| JP2014018852A (ja) * | 2012-07-23 | 2014-02-03 | Kobe Steel Ltd | サブマージアーク溶接用フラックス入りワイヤ |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233149A (en) * | 1991-08-02 | 1993-08-03 | Eaton Corporation | Reprocessing weld and method |
| US6336583B1 (en) * | 1999-03-23 | 2002-01-08 | Exxonmobil Upstream Research Company | Welding process and welded joints |
| JP5179073B2 (ja) * | 2007-03-08 | 2013-04-10 | 日鐵住金溶接工業株式会社 | ガスシールドアーク溶接用フラックス入りワイヤ |
| EP2289661B1 (en) * | 2009-08-27 | 2014-04-02 | Nippon Steel & Sumikin Welding Co., Ltd. | Flux cored wire for gas shielded arc welding of high strength steel |
| JP5459083B2 (ja) * | 2010-06-04 | 2014-04-02 | 新日鐵住金株式会社 | 高張力鋼用炭酸ガスシールドアーク溶接用フラックス入りワイヤ |
| JP5557790B2 (ja) * | 2011-04-13 | 2014-07-23 | 日鐵住金溶接工業株式会社 | 2電極水平すみ肉co2ガスシールドアーク溶接用フラックス入りワイヤ |
-
2013
- 2013-08-07 JP JP2013164606A patent/JP6061809B2/ja not_active Expired - Fee Related
-
2014
- 2014-06-09 WO PCT/JP2014/065251 patent/WO2015019698A1/ja not_active Ceased
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- 2014-06-09 EP EP14834592.9A patent/EP3031568A4/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003251489A (ja) | 2002-02-27 | 2003-09-09 | Jfe Steel Kk | 低合金鉄鋼材料の溶接継手及びその溶接方法 |
| JP2003275890A (ja) | 2002-03-18 | 2003-09-30 | Nippon Steel Corp | 疲労寿命向上処理方法およびそれによる長寿命溶接継手 |
| JP2004042133A (ja) | 2002-05-15 | 2004-02-12 | Jfe Steel Kk | 耐応力腐食割れ性に優れた溶接継手およびその製造方法 |
| JP2012115877A (ja) * | 2010-12-01 | 2012-06-21 | Kobe Steel Ltd | フラックス入りワイヤ |
| JP2013018012A (ja) * | 2011-07-08 | 2013-01-31 | Nippon Steel & Sumitomo Metal Corp | 高張力鋼ガスシールドアーク溶接用フラックス入りワイヤ |
| JP2013091082A (ja) * | 2011-10-26 | 2013-05-16 | Nippon Steel & Sumikin Welding Co Ltd | 低温用鋼のサブマージアーク溶接方法 |
| JP2013173179A (ja) * | 2012-02-27 | 2013-09-05 | Kobe Steel Ltd | 耐水素脆化感受性に優れた溶接金属 |
| JP2013226577A (ja) * | 2012-04-25 | 2013-11-07 | Nippon Steel & Sumikin Welding Co Ltd | 原油油槽鋼のガスシールドアーク溶接用フラックス入りワイヤ |
| JP2014018852A (ja) * | 2012-07-23 | 2014-02-03 | Kobe Steel Ltd | サブマージアーク溶接用フラックス入りワイヤ |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP3031568A4 * |
Also Published As
| Publication number | Publication date |
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| CN105408053B (zh) | 2018-08-10 |
| EP3031568A4 (en) | 2017-01-18 |
| KR20160028473A (ko) | 2016-03-11 |
| EP3031568A1 (en) | 2016-06-15 |
| JP2015033703A (ja) | 2015-02-19 |
| KR101823798B1 (ko) | 2018-01-30 |
| CN105408053A (zh) | 2016-03-16 |
| JP6061809B2 (ja) | 2017-01-18 |
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