JPH0481282A - Resistance welding method using amorphous foil - Google Patents

Abstract

PURPOSE:To reduce the quantity of electric power used and to simplify pressuring equipment by holding amorphous foil between members to be welded, energizing these members to be welded and the amorphous foil and welding the members to be welded together. CONSTITUTION:A foil-shaped body of an amorphous metallic alloy (Fi-Si-Balloy) consisting of iron and other metallic elements (silicon and boron), namely, the amorphous foil 8 is first held between two iron plates (steel plates) 1 and 2 to be welded. When electrodes (electrode tips) 9 and 10 are put from the arrow (a) and (g) directions from both surfaces of a weld zone A with the amorphous foil 8 between the two iron plates (steel plates) 1 and 2 and energizing is executed thereon, since the amorphous foil 8 has the lower melting point than members 1 and 2 to be welded which are base metals, the amorphous foil 8 is molten and other elements (silicon and boron) except iron to constitute this amorphous foil 8 are diffused and iron is mixed with iron of both members 1 and 2 to be welded and after energizing is stopped, these are solidified and both members 1 and 2 can be joined only by slight pressurization.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a resistance welding method in which welding is performed by passing an electric current through the contact portions of members to be welded and heating them by the resistance heat generated here, and in particular relates to This paper relates to a resistance welding method using crystalline amorphous foil.

[Prior Art] Conventionally, in the production of vehicles such as automobiles, in order to join two metal members, the two metal members are polymerized, and electrodes are applied to both sides of the joined part to apply electric current. , and the so-called lap resistance welding method, in which both members are welded together under pressure, is often employed.

First, an example of spot welding, which is one of the lap resistance welding methods, will be described. As shown in Fig. 7, members 1 and 2 to be welded, for example, two iron plates (steel plates), are overlapped and the welded part is Electrodes are applied in the direction perpendicular to both sides of A in the direction of arrows a and b, and a current is applied to heat the metal member at welded part A to the melting temperature using resistance heat, and further pressure is applied to fuse and bond the molten part B. . This is mainly used, for example, when welding the body of a vehicle or other two sheet metal members.

Regarding an example of projection welding, such projection welding is performed by inserting a plug 5 into the end opening of a sleeve yoke 4 attached to the end of the main shaft 3 on the engine side, for example, as shown in FIG. When welding, etc., as shown in Figure 9 (enlarged cross-sectional view of part By energizing the electrodes 6 and 7, the protrusions are melted and pressure is applied in the direction of arrow C to weld the two parts 4.5 together, and is used for welding sheet metal members and parts, and between parts.

In addition, to provide a supplementary explanation of the sleeve yoke 4, the sleeve yoke 4 attached to the main shaft 3 on the engine side is connected to a member on the propeller shaft side via a journal (not shown).

Configure a universal joint.

Further, the plug 5 is a stopper provided to prevent oil leakage from the main shaft 3 side.

[Problems to be Solved by the Invention] However, in spot welding of such conventional lap resistance welding, a high pressing force (300 to 400 kg) is required.
In addition, since a molten part is created in the metal part, dents and burns caused by the electrode tip remain on the surface of the welded part after welding. Therefore, there is a problem in that the appearance of the welded part is poor, making it unsuitable as a welding method for the surface of a vehicle, that is, a visible part.

In addition, projection welding requires high pressure to crush multiple points or linear protrusions, requires rigidity of the pressurized part, and requires a large current to flow, making it expensive. This welding method is
There is a problem in that production costs are high.

The present invention was developed in view of these problems. By sandwiching an amorphous foil between the parts to be welded and applying electricity to this part, welding can be performed at low cost with a small current and pressure. It is an object of the present invention to provide a resistance welding method using an amorphous foil that can be welded without leaving any deformation on the surface of the member.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the resistance welding method using amorphous foil of the present invention according to claim 1 includes sandwiching an amorphous foil between members to be welded, and then welding them. The method is characterized in that the members to be welded are welded together by contacting electrodes to the members to be welded and applying electricity to the members to be welded and the amorphous foil.

In addition, when the member to be welded is a steel material, it is preferable to use an amorphous foil made of an alloy of iron, silicon, and boron (Claim 2).

[Function] In the resistance welding method using the amorphous foil according to the invention described in claim 1 above, since the amorphous material has a lower melting point than the welding member and has a higher electrical resistance, it can be welded with a smaller current than before. , the amorphous foil is melted and diffused to effect solidification bonding. Therefore, the two members are bonded together by the diffusion of atoms due to the melting of the amorphous material without melting the two members, and as a result, the two members are naturally welded with a lower pressure than in the past.

Further, in the second aspect of the present invention, the amorphous foil is made of an alloy of iron, silicon, and boron, and when the amorphous foil is melted by electricity, the silicon and boron are diffused and iron remains, and the iron is the welding member. The steel material melts and mixes with the iron, and the two members are welded together.

[Examples] Examples of the present invention will be described below with reference to the drawings.
1 to 3 show a welding method between sheet metal members according to a first embodiment of the present invention. FIG. 1 is a partial sectional view of each member before welding by this method, and FIG. 2(b) is an enlarged sectional view of the main part of FIG. 2(a), and FIG. 3(a) is a partial sectional view of each member after energizing by this method. 3(b) is an enlarged sectional view of the main part of FIG. 3(a), and FIGS. 4 to 6 show a welding method between parts according to a second embodiment of the present invention. 4 is a sectional view of the sleeve yoke, FIG. 5 is an enlarged sectional view of the main part before energization by this method, and FIG. 6 is an enlarged sectional view of the main part after energization by this method. The same reference numerals as in FIGS. 7 to 9 indicate substantially similar parts.

First, a first embodiment shown in FIGS. 1 to 3 will be described.

Now, when carrying out the method according to the first embodiment, as shown in FIG. 1, iron and other metal elements [silicon (
A foil-like body of an amorphous metal alloy (Fe-8i-B alloy), that is, an amorphous foil 8, is sandwiched. Then, as shown in FIG. 2(a), an electrode (electrode tip) 9°10
When applied from the directions of arrows a and b and energized, Fig. 3 (a)
As shown in the figure, since the amorphous foil 8 has a lower melting point (approximately 1200'C) than the base materials 1 and 2 to be welded, the amorphous foil 8 melts and the iron constituting the amorphous foil 8 melts. The other elements (silicon, boron) diffuse, the iron mixes with the iron of the surface welding members 1 and 2, and after the current is turned off, it solidifies and there is a slight stress between the two members 1 and 2. Bonding is possible only with pressure (for example, about 0.5 to 1 kgf/am'').

That is, before energization, when the amorphous foil 8 is sandwiched between the members 1 and 2, as shown in FIG. 2(b), the structures of the members 1 and 2 are different; Figure 2 (
When electricity is applied through both members 1 and 2 as shown in a), the amorphous foil 8 melts and diffuses as shown in FIG. A uniform structure is generated in part A, and both members are welded together.

In this way, the amorphous foil 8 is sandwiched between the members 1 and 2 to be welded, and a slight pressure is applied while applying electricity to these welding members 1 and 2 and the amorphous foil 8, so that the welding members are welded together. Amorphous foil 8 with electric current
melts and diffuses and mixes with the welding parts, and it is possible to weld between the welding parts 1 and 2 with a small pressure.This reduces the amount of electricity used and simplifies the pressurizing equipment, making it possible to weld. In addition to making it possible to reduce these costs and production costs, this method does not leave dents or other marks on the welded surface after welding, unlike conventional spot welding. Therefore, it can be said that it is extremely suitable for use as a means for welding the outer surface of a vehicle.

Furthermore, when the welding members 1 and 2 are made of steel, by using an amorphous foil 8 made of an alloy of iron, silicon, and boron, the silicon and boron will not diffuse and remain, and only the iron will remain in the steel material. Since it mixes well with iron, it also has the effect of better welding.

Next, the second embodiment shown in FIGS. 4 to 6 will be described. In this second embodiment, first, for example, in the sleeve yoke 4 made of iron as shown in FIG. An iron plug 5 is abutted to close the opening on the end face.

Then, between the end face of the sleeve 4b and the plug 5, iron and other metal elements [silicon] are present.

An annular amorphous foil 8' made of an amorphous alloy made of boron is interposed, and an electric current is applied between the electrode 6 and other electrodes (see FIG. 8). Then, the amorphous foil 8' is melted, and its iron is mixed with the iron of the sleeve yoke 4 and the plug 5, as described above, and the joint C is welded as shown in FIG.

As mentioned above, in this second embodiment as well, by applying electricity through the amorphous foil 8' to the welding part C to be welded, the amorphous alloy has a high electrical resistance, and the base metal, which is the member to be welded, can be welded. Lower melting point than 4,5 (1
(approximately 200°C), the amorphous foil is melted, diffused, and solidified with a smaller current than in conventional welding methods, so the amount of electricity used can be reduced.

In addition, the pressure (1 kg/cm"
(below) can be suppressed to a low level, thereby making it possible to simplify the configuration of the pressurizing section and make it inexpensive.

Therefore, while attempting to reduce the amount of electric power required for welding work, it is also possible to reduce production costs by not requiring almost any pressing force.

Moreover, unlike conventional spot welding, no dents or burns remain after welding, and there are also advantages in that protrusions required in conventional projection welding can be omitted.

Furthermore, when the members to be welded are steel materials as in this example, by using an amorphous foil made of an alloy of iron, silicon, and boron, the amorphous foil has a low melting point and a small size as described above. The current melts well, and the silicon and boron diffuse and are not left behind, so the molten iron mixes with the base metal of the steel to be welded, and almost no pressure is required. This allows the desired welding to be performed.

[Effects of the Invention] As detailed above, according to the resistance welding method using amorphous foil of the present invention recited in claim 1, an amorphous foil is sandwiched between welding members of the members to be welded, and these welding members are welded. Since the welding parts are welded together by applying electricity to the amorphous foil, the amorphous foil melts and diffuses with a small electric current, mixes with the welding parts, and welds the welding parts together with a small pressure. can. Therefore, by reducing the amount of power used and simplifying the pressurizing equipment, it is possible to reduce the cost of welding and reduce the production cost. In addition, conventional spot welding does not leave any dents or other marks on the welded surface after welding, making it suitable as a means of welding the exterior surface of a vehicle, and the projection welding required for welding parts in conventional projection welding. can also be omitted, which is useful for improving work efficiency.

Furthermore, in the resistance welding method using an amorphous foil of the present invention according to claim 2, when the welding member is a steel material, by using an amorphous foil made of an alloy of iron, silicon, and boron, silicon According to the above-mentioned claim 1, the boron is diffused and only the iron is mixed well with the iron of the steel material.
The advantage is that the described welding method can be carried out even better.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment in which the resistance welding method using amorphous foil of the present invention is applied to a welding method between sheet metal members, and Figure 1 shows parts of each member before welding by this method. 2(a) is a partial sectional view of each member before energization by this method, FIG. 2(b) is an enlarged sectional view of the main part of FIG. 2(a), and FIG. 3(b) is an enlarged sectional view of the main part of FIG. 3(a), and FIGS. 4 to 6 show resistors using the amorphous foil of the present invention. This shows a second embodiment in which the welding method is applied to the welding method between parts, and FIG. 4 is a cross-sectional view of the sleeve yoke;
Fig. 5 is an enlarged sectional view of the main part before energization by this method, Fig. 6 is an enlarged sectional view of the main part after energization by this method, and Fig. 7 is a welding of two sheet metal members in the case of conventional spot welding. FIG. 8 is a cross-sectional view of a sleeve yoke and a plug shown as an example of a welding member in conventional projection welding, and FIG. 9 is an enlarged cross-sectional view of the part ■ in FIG. 8. 1.2...Welding member, 3--main shaft, 4--
- Sleeve yoke (welding member), 4a - Yoke part, 4b - Sleeve part, 5 - Plug (welding member)
, 6゜7.9.10...-electrode, 8...-amorphous foil, 8'--annular amorphous foil, A...-welded part, B-melted part, C-joint part.

Claims (2)

[Claims] (1) After sandwiching the amorphous foil between the parts to be welded,
A resistance welding method using amorphous foil, characterized in that the above-mentioned members to be welded are welded together by contacting electrodes to each of these members to be welded and applying electricity to the above-mentioned members to be welded and the amorphous foil. . (2) The resistance welding method using an amorphous foil according to claim 1, wherein when the member to be welded is a steel material, the amorphous foil is an amorphous foil made of an alloy of iron, silicon, and boron.