JP2016068096A - Electric welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric welding device capable of making small or eliminating a gap formed between a plurality of plate materials when the plural plate materials are welded so as to overlap with each other.SOLUTION: An electric welding device is configured to weld a first member containing a first material, a second member containing a second material weldable to the first material, and a third member containing a third material different from the first material and the second material and sandwiched therebetween. The third member has a through hole and a gap in the through hole, or when a fourth member containing a fourth material weldable to the first material or the second material is arranged, the electric welding device comprises a first joining electrode capable of abutting on the first member and supplying electricity to between the first member and the second member, and a first outer peripheral electrode arranged at a periphery of the first joining electrode. The first outer peripheral electrode abuts on the first member together with the first joining electrode and supplies the electricity to between the first joining electrode and the first outer peripheral electrode before the first member, the second member, and the third member are joined together.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electric welding apparatus.

  Conventionally, for example, as an invention related to a spot welding method of a high-strength steel plate excellent in joint strength that can prevent the occurrence of scattering while preventing the occurrence of indentation, the tensile strength of the steel plates to be joined and A sheet thickness, a pressure applied in spot welding, a current value, an energization time, etc. are known to be set to specific values (claim 1, paragraph [0017], [0018], [0026] of Patent Document 1; [0027] See FIG. 1 and FIG.

Patent No. 5418726

  When joining different kinds of metal plates, when a plurality of plate materials are stacked, a gap due to a difference in dimensions such as thickness and unevenness of each plate material often occurs. If there is a gap between the plate materials, scattering or the like may occur during spot welding, and this scattering may cause poor welding.

  Therefore, the problem to be solved by the present invention is to provide an electric welding apparatus capable of reducing or eliminating gaps formed between plate members when a plurality of plate members are overlapped and welded.

  As means for solving the above problems, an electric welding apparatus according to the present invention includes a first member containing a first material, a second member containing a second material weldable to the first material, and a first member. An electric welding apparatus that includes a third material different from the material and the second material and joins the third member sandwiched between the first member and the second member, the third member having a through hole, The inside of the through hole is an air gap, or can contact the first member when the fourth member containing the fourth material that can be welded to the first material and the second material is disposed. A first joining electrode that can be energized between the member and the second member; and a first outer peripheral electrode disposed around the first joining electrode; and joining the first member, the second member, and the third member. Before, a 1st outer periphery electrode contact | abuts with a 1st junction electrode with respect to a 1st member, and it supplies with electricity between a 1st junction electrode and a 1st outer periphery electrode. .

  In the electric welding apparatus according to the present invention, a second joint electrode capable of contacting the second member and energized between the first joint electrode and a second outer peripheral electrode disposed around the second joint electrode And before joining the first member, the second member, and the third member, the second outer peripheral electrode contacts the second member together with the second joint electrode, and the second joint electrode, the second outer peripheral electrode, It is preferable to energize during the period.

  Moreover, the electric welding apparatus according to the present invention preferably includes an insulated pressing member that supports the first member and the second member before joining the first member, the second member, and the third member.

  According to the present invention, before the first member, the second member, and the third member are joined, the energized portion of the first member is heated by energizing the first joined electrode and the first outer peripheral electrode. Soften. When the periphery of the first joining electrode is softened, when the pressure applied by the electrode is applied to the first member during spot welding, a portion where a gap is easily formed between the plate members is softened and easily deformed. An electric welding apparatus that is reduced or eliminated can be provided.

FIG. 1 is a schematic view showing a part of a vehicle in which an electric welding apparatus according to the present invention is used. FIG. 2 is a schematic cross-sectional view showing a part of a vehicle in which the electric welding apparatus according to the present invention is used. FIG. 3 is a flowchart showing a vehicle manufacturing process in which the electric welding apparatus according to the present invention is used. 4 (A) and 4 (B) are schematic cross-sectional views showing an embodiment of an electric welding apparatus according to the present invention. 5 is a schematic cross-sectional view showing how to use the embodiment shown in FIG. 4, FIG. 5 (A) is a schematic cross-sectional view showing the embodiment shown in FIG. 4 (A) during energization, and FIG. 5B is a schematic cross-sectional view showing the spot welding in the embodiment shown in FIG. 5A, and FIG. 5C is a schematic cross-sectional view after the spot welding in the embodiment shown in FIG. FIG. 5D is a schematic cross-sectional view showing the embodiment shown in FIG. 4B after spot welding. 6 (A) and 6 (B) are schematic plan views showing an arrangement example of the second joining electrode or the second outer peripheral electrode of the electric welding apparatus according to the present invention.

  An embodiment of an electric welding apparatus according to the present invention will be described with reference to the drawings.

(1) Application part of the present invention in a vehicle The electric welding apparatus according to the present invention can be applied to a part that requires welding between different types of metals when manufacturing, for example, a vehicle body part and a roof part. it can. As an example of a part to which an embodiment of the electric welding apparatus according to the present invention can be applied, FIGS. 1 and 2 show a structure which is a side part of a vehicle body.

  As shown in FIG. 1, the side sill 101 of the skin member extending in the front-rear direction, the hinge pillar 102 extending upward from the front end portion of the side sill 101, and the center pillar 103 extending upward from the center portion of the side sill 101, Are integrally formed. Further, as shown in FIG. 2 which is a cross-sectional perspective view of a portion A in FIG. 1, a side sill reinforcement 105 which is an intermediate member and a hinge pillar reinforcement are provided inside the side sill 101, the hinge pillar 102, and the center pillar 103. (Not shown in FIG. 2), a center pillar reinforcement (not shown in FIG. 2), and the like are provided.

  As shown in FIG. 2, the side sill 101 includes a side sill inner 101 a that is a skin member on the inside of the vehicle and a side sill outer 101 b that is a skin member on the outside of the vehicle. Inside the side sill inner 101a and the side sill outer 101b, an inner reinforcement 105a and an outer reinforcement 105b, which are reinforcing members for the side sill 101, are disposed.

  The side sill inner 101a and the side sill outer 101b and the inner reinforcement 105a and the outer reinforcement 105b are joined by welding, but they are often formed of different metals, and high welding is attempted even if direct welding is attempted. It was difficult to ensure strength.

Therefore, as shown in FIG. 2, a through hole is formed in at least one of the inner reinforcement 105a and the outer reinforcement 105b located on the inner side of the joined body, and the side sill inner 101a and the side sill outer 101b located on the outer side. It is possible to adopt a form in which a disk-shaped member formed of a weldable material is inserted and arranged, and the disk-shaped member and the side sill inner 101a and the side sill outer 101b are welded.
Thereby, high welding strength is securable.

  The electric welding apparatus according to the present embodiment has, for example, slight backlash or inner reinforcement when the side sill inner 101a, the side sill outer 101b, the inner reinforcement 105a and the outer reinforcement 105b are overlapped for welding. When there is a difference in thickness between the ment 105a and the outer reinforcement 105b and the disk-shaped member, it can be used at the stage before welding. When spot welding is performed with rattling or the like occurring, scattering may occur during the welding operation, which may make it difficult to ensure good welding strength.

(2) Time of application of the present invention at the time of vehicle manufacture The electric welding apparatus according to the present invention is a process from press-molding parts, such as a body part and a roof part of a vehicle, to welding the press-molded parts. Can be applied to. FIG. 3 is a flowchart showing the vehicle manufacturing process.

  As shown in FIG. 3, examples of the vehicle manufacturing process include a component press molding process S1, a vehicle body welding process S2, a vehicle body painting process S3, and an assembly process S4. The part press molding step S1 is a step of press molding the parts to be the body part and the roof part into respective shapes. The vehicle body welding step S2 is a step of collecting and welding a plurality of parts press-formed in the part press-forming step S1. The vehicle body painting step S3 is a step of painting outer surfaces such as a body part and a roof part, which have been welded to complete the outer shape to some extent. Assembly process S4 is a process of attaching an engine, tires, auxiliary equipment, interior materials, and the like to the painted body.

The electric welding apparatus according to this embodiment can be applied before the welding operation in the vehicle body welding step S2, preferably immediately before the welding operation.
Note that the disk-shaped member shown in FIG. 2, that is, a fourth member to be described later, can be performed before the press forming in the component press forming step S1 and before the welding in the vehicle body welding step S2. When the part where the fourth member is inserted and arranged is a part that does not deform even after the part press molding process S1, a through hole can be provided from the front of the part press molding process S1, and the fourth member can be inserted and arranged. . On the contrary, when the part where the fourth member is inserted and arranged is a part that is deformed by the part press molding process S1, a through hole is provided between the part press molding process S1 and the vehicle body welding process S2, and the fourth member Is inserted and arranged.

(3) Member to be joined When the electric welding apparatus according to the present embodiment is joined by spot welding, for example, after overlapping the first member, the second member, the third member, and the fourth member. Furthermore, it is used when welding is performed with a gap between the members.

The first member is a plate-like member containing the first material, for example.
The second member is, for example, a plate-like member containing a second material that can be welded to the first material.
The third member is a plate-like member containing a third material different from the first material and the second material, for example. Further, the third member is disposed so as to be sandwiched between the first member and the second member when being joined. A through-hole is formed in one part of the third member located between the first member and the second member during joining. When joining, the inside of a through-hole is divided into the case where it is a space | gap, and the case where a 4th member is arrange | positioned. The fourth member is, for example, a plate-like member that includes a fourth material that can be welded to the first material and the second material, and is formed to have substantially the same shape and the same diameter as the through hole.

As a combination of the first material and the third material, it is difficult to obtain a welding strength that can withstand use as a vehicle component, for example, by combining a material that is difficult to weld, or by generating an intermetallic compound or the like even after welding. Combination of various materials. Specifically, as a combination of the first material and the third material, for example, the first material is iron or iron-based material, and the third material is aluminum, aluminum-based material, magnesium, magnesium-based material, fiber reinforced plastic, or the like. A certain combination or the like can be adopted.
In addition, the first material, the second material, and the fourth material may be a combination of materials that do not generate or hardly generate an intermetallic compound even if they are welded to each other by ordinary spot welding or the like. As the second material and the fourth material, it is preferable to use the same material or a similar material as the first material after the combination of the first material and the third material described above is determined.

  Note that the above-mentioned welding is difficult, and that welding is possible is, for example, welding with energization, specifically, when using spot welding that is often used in the manufacture of vehicle parts, This means whether or not welding is possible. That is, the first material, the second material, the fourth material, and the third material are difficult to weld with energization, and the first material, the second material, and the fourth material can be welded with energization. .

(4) Outline of Electric Welding Apparatus Here, FIG. 4 shows an electric welding apparatus 1 according to an embodiment of the present invention.
FIG. 4A and FIG. 4B are schematic cross-sectional views showing the electric welding apparatus 1. Note that the embodiment shown in FIG. 4A and the embodiment shown in FIG. 4B have the same configuration of the electric welding apparatus 1, and the thickness of the fourth member 5 is different.

  The electric welding device 1 is a device that joins the first member 2, the second member 3, the third member 4, and the fourth member 5, and includes a first joining electrode 7, a first outer peripheral electrode 8, and a second member. And a bonding electrode 9.

The first bonding electrode 7 is a conductive rod-shaped member that can move forward and backward toward the first member 2 and can contact the first member 2.
The second bonding electrode 9 is a conductive rod-shaped member that can move forward and backward toward the second member 3 and can contact the second member 3.
The first bonding electrode 7 and the second bonding electrode 9 can be energized between the first member 2 and the second member 3 while being in contact with the first member 2 and the second member 3, respectively.

The first outer peripheral electrode 8 is a conductive rod-shaped member that can move forward and backward toward the first member 2, can contact the first member 2, and is disposed around the first bonding electrode 7. Specifically, the first outer peripheral electrode 8 may be an electrode that can be energized by positively providing a potential difference with the first bonding electrode 7. There may not be, for example, it may be a grounded earth.
The first joining electrode 7 and the first outer peripheral electrode 8 are in contact with the first member 2 before joining the first member 2, the second member 3, the third member 4, and the fourth member 5. It can be energized.
In addition, you may attach the 1st outer periphery electrode 8 to an electric welding apparatus provided with the 1st joining electrode 7 and the 2nd joining electrode 9 as a detachable attachment.

In the embodiment shown in FIG. 4A, the thickness of the fourth member 5 is set smaller than the thickness of the third member 4. In this case, as shown in FIG. 4A, the fourth member 5 is placed in the through hole 6 in a state where the first member 2, the second member 3, the third member 4 and the fourth member 5 are overlapped before joining. Even if the fourth member 5 is disposed, the through-hole 6 is not filled in the fourth member 5, so that a gap is formed by the first member 2, the through-hole 6 of the third member 4, and the fourth member 5.
In the embodiment shown in FIG. 4B, the thickness of the fourth member 5 is set larger than the thickness of the third member 4. In this case, as shown in FIG. 4A, the fourth member 5 is placed in the through hole 6 in a state where the first member 2, the second member 3, the third member 4 and the fourth member 5 are overlapped before joining. When the first member 2 and the third member are arranged, the first member 2 is lifted from the third member 4 by the fourth member 5, for example. A gap is formed between the two.

Conventionally, when the plate-like members are overlapped and joined by spot welding, basically, when the third member 4 itself is not provided, and even if the third member 4 is provided, the through hole 6 and the first member The four members 5 and the like were either provided. Even in such a conventional case, when the plate-like members are overlapped, a gap is generated in the welded part, and this gap often becomes a cause of scattering.
In the third member 4 sandwiched between the outer first member 2 and the second member 3 as in the present embodiment, when the through hole 6 is formed and the fourth member 5 is further disposed, the component is more than conventional. Since the number of points is increasing, a gap is more likely to occur in the welded part.

When the first member 2, the second member 3, the third member 4 and the fourth member 5 to be joined are formed as, for example, a vehicle component, basically, the dimensional accuracy and the surface unevenness accuracy are strictly limited. In many cases, accurate accuracy is not required.
Therefore, when joining the vehicle components using spot welding, the first member 2, the second member 3, the third member 4, and the fourth member 5 are overlapped, particularly the third member 4 and the fourth member 5. In particular, a gap is easily generated in and near the through hole 6 due to the difference in thickness between the first member 2 and the third member 4 and the unevenness of the unevenness formed through press molding of the first member 2, the second member 3, and the third member 4. .
The electric welding apparatus 1 according to the present embodiment can reduce or eliminate the gap during welding even if it is a plate-like member that causes a gap when it is overlapped.

(5) Usage Method of Electric Welding Device, Its Operation, and Action Here, the usage method of the electric welding device 1 will be described with reference to FIG.
5 is a schematic cross-sectional view showing how to use the embodiment shown in FIG. 4, FIG. 5 (A) is a schematic cross-sectional view showing the embodiment shown in FIG. 4 (A) during energization, and FIG. 5B is a schematic cross-sectional view showing the spot welding in the embodiment shown in FIG. 5A, and FIG. 5C is a schematic cross-sectional view after the spot welding in the embodiment shown in FIG. FIG. 5D is a schematic cross-sectional view showing the embodiment shown in FIG. 4B after spot welding.

When the thickness of the fourth member 5 is set smaller than the thickness of the third member 4 as shown in FIG. 4 (A), first, the respective distal end portions of the first bonding electrode 7 and the first outer peripheral electrode 8 are The first member 2 is pressed against and brought into contact with the surface. The contact of the electrode at this time does not need to be pressure contact as in spot welding. The contact pressure of the first bonding electrode 7 can be adjusted by a driving member (not shown) such as a motor that can be appropriately advanced and retracted and fixed with respect to the first member 2 for spot welding. The first outer peripheral electrode 8 is preferably pressed against the first member 2 by being biased toward the first member 2 by a biasing member such as a coil spring. If pressed by the urging member, even if vibration or impact acts on the first member 2 and the first outer peripheral electrode 8 during energization, the contact state and energization state can be maintained.
At this time, the second bonding electrode 9 is not in contact with the second member 3, and the second bonding electrode 9 is insulated from the second member 3.

  The first bonding electrode 7 and the second bonding electrode 9 are preferably positioned in advance with respect to the first member 2 and the second member 3. Specifically, the first and second bonding electrodes 7 and 9 and the fourth member 5 are arranged so that the axes of the fourth member 5 and the fourth member 5 are aligned or substantially coincided with each other, so that each electrode is connected to the first member 2 and When the second member 3 is moved and brought into contact with the second member 3 and further welded, a welding portion is formed at a substantially central portion of the fourth member 5. Thereby, favorable welding strength can be obtained. Therefore, the first bonding electrode 7 and the second bonding electrode 9 are appropriate devices for determining the internal structure of the superimposed body in which the first member 2, the second member 3, the third member 4, and the fourth member 5 are overlapped. It is preferable to specify the part where the fourth member 5 is arranged and to perform alignment before the operation shown in FIG.

  As shown in FIG. 5A, the first bonding electrode 7 and the first outer peripheral electrode 8 are energized while being in contact with the first member 2. Energization between the first bonding electrode 7 and the first outer peripheral electrode 8 is achieved by a current flowing through the first member 2 in contact with each electrode. In FIG. 5A, the outline of the energization path in the first member 2 is indicated by a bold line.

At this time, when the third member 4 contains a conductive material as the third material, no current is passed if there is a gap between the first member 2 and the third member 4. In addition, even if there is a gap between the first member 2 and the third member 4, the first member 2 is softened and easily deformed by energization between the first bonding electrode 7 and the first outer peripheral electrode 8. Therefore, after spot welding, the gap is deformed so as to be reduced or eliminated.
In addition, when the third member 4 contains a non-conductive material as the third material, a gap is formed between the first member 2 and the fourth member 5 without energizing the third member 4. Therefore, the fourth member 5 is not energized. Therefore, basically only energization between the first bonding electrode 7 and the first outer peripheral electrode 8 occurs.

  The voltage and current required for energization between the first bonding electrode 7 and the first outer peripheral electrode 8 do not need to be a large voltage and a large current required for spot welding. In the energization shown in FIG. 5 (A), the energization path and the surrounding area may not be melted, and the first member 2 may be heated and softened to such an extent that it is easily deformed during spot welding.

  When the energization path between the first bonding electrode 7 and the first outer peripheral electrode 8 and the peripheral portion thereof are softened, it is preferable to perform spot welding before the temperature of the softened portion is lowered and the softened state is released. Specifically, as shown in FIG. 5B, the first bonding electrode 7 is further pressed toward the first member 2, the first outer peripheral electrode 8 is separated from the first member 2, and the second The bonding electrode 9 is pressed against the second member 3 and further energized between the first bonding electrode 7 and the second bonding electrode 9. Since the part surrounded by the broken line in the first member 2, that is, the part where the first bonding electrode 7 is in contact and its peripheral part are softened, the first bonding electrode pressed against the first bonding electrode 7 while being energized 7 can be easily deformed toward the fourth member 5.

  When the spot welding is completed, as a result, as shown in FIG. 5C, the softened first member 2 is pressed by the first bonding electrode 7, whereby the first member 2 and the fourth member 5 The first member 2 is deformed so as to fill the gap with respect to the gap formed therebetween.

Normally, a gap is formed in the welded part during spot welding, and if the pressure applied by the electrode is further increased, scattering is likely to occur.
However, in spot welding using the electric welding apparatus 1, the welded portion of the spot welding is softened in advance by energization between the first joining electrode 7 and the first outer peripheral electrode 8. As a result, even if a gap is formed at the welding site and the pressure applied by the electrode is further high, the softened member to be welded can be deformed so as to fill the gap, so that it is difficult to generate or generate scattering. do not do. In addition, even if the gap formed in the welded part and its vicinity is not completely filled, the occurrence of scattering can be reduced by reducing the gap itself.

  Even when the thickness of the fourth member 5 is set to be larger than the thickness of the third member 4 as shown in FIG. 4 (B), the welding can be suitably performed by using the electric welding apparatus 1. Specifically, spot welding is performed after the portion where the first bonding electrode 7 of the first member 2 contacts and its peripheral portion are softened. As a result, as shown in FIG. The first member 2 is deformed so that the gap generated in the vicinity of 5 is filled, and scattering is hardly or does not occur.

In the embodiment shown in FIG. 5, the fourth member 5 is disposed in the through hole 6 in the third member 4. In the present embodiment, any member is not disposed in the through hole 6, and spot welding can be suitably performed even in the case of a gap.
When the inside of the through hole 6 is a gap, the first member 2 is softened due to energization between the first bonding electrode 7 and the first outer peripheral electrode 8, so that the first bonding electrode 7 causes the first bonding electrode 7 during spot welding. The softened part of the one member 2 is pushed into the through hole 6 in the gap. Thereby, since the clearance gap becomes small when the softened 1st member 2 is pushed in, the through-hole 6 does not occur easily at the time of spot welding.

(6) Arrangement of First Junction Electrode and First Peripheral Electrode Here, the arrangement of the first junction electrode and the first outer circumference electrode will be described with reference to FIG.
6A and 6B are schematic plan views illustrating an arrangement example of the first joining electrode 7 and the first outer peripheral electrode 8 of the electric welding apparatus 1.

The first outer peripheral electrode 8 only needs to be arranged around the first bonding electrode 7. For example, as shown in FIG. 6A, three first outer peripheral electrodes 8 are arranged at equal intervals around the first bonding electrode 7. Can do. The number of the first outer peripheral electrodes 8 is not particularly limited. For example, when there are many gaps formed in the vicinity of the fourth member 5, the contact portion of the first bonding electrode 7 in the second member 3 and its peripheral portion are sufficient. It is preferable to set the number of the first outer peripheral electrodes 8 to be more than three because it is preferable to make the gap as small as possible during welding.
Further, as shown in FIG. 6B, a first outer peripheral electrode 81 having a circular cross-sectional shape that completely surrounds the first bonding electrode 7 may be provided. The first outer peripheral electrode 81 preferably has a shape and material that conforms to various shapes of the first member 2, and is carried by a flexible member such as a net, strip, chain, or cloth. An earth or the like can be employed.

(7) Modified Example of Electric Welding Device Here, a modified example of the electric welding device 1 according to the present embodiment will be described below.

In the present embodiment, like the first member 2, the second member 3 may be softened in advance before spot welding.
Specifically, the second outer peripheral electrode is arranged around the second bonding electrode 9, and the first outer peripheral electrode 8 is bonded before the first member 2, the second member 3, the third member 4, and the fourth member 5 are bonded. And after making the 2nd outer periphery electrode contact | abut to the 2nd member 3, it can supply with electricity between the 2nd joining electrode 9 and the 2nd outer periphery electrode. As a result, the contact portion of the first bonding electrode 7 in the first member 2 and its peripheral portion are softened, and the contact portion of the second bonding electrode 9 in the second member 3 and its peripheral portion are softened. .
Therefore, since the softened site | part is formed in the both sides of the 1st member 2 and the 2nd member 3 at the time of spot welding, the clearance gap near a welding site | part tends to become still smaller or it will disappear easily.

In the present embodiment, when the first member 2 is softened using the first outer peripheral electrode 8 before the first member 2, the second member 3, the third member 4, and the fourth member 5 are joined, When softening the 2nd member 3 using 2 outer peripheral electrodes, it is preferable to support the 1st member 2 and the 2nd member 3 with the insulated pressing member.
It is preferable to provide an insulated pressing member because the positions of the first member 2 and the first bonding electrode 7 and the like do not shift while the first member 2 and the like are energized and softened.

The second bonding electrode 9 can also be used as a pressing member. Specifically, during the softening operation of the first member 2 shown in FIG. 5A, the first member 2 and the second member 2 are brought into contact with each other by bringing the insulated second bonding electrode 9 into contact with the second member 3 side. The member 3 can be supported.
In order to place the second bonding electrode 9 in an insulated state, for example, a separate insulator is interposed between the second bonding electrode 9 and the second member 3 or the first bonding electrode 7 and the second bonding. A configuration in which the electrode 9 is kept at the same potential can be employed. Since the form in which the insulator is interposed can be used without replacing the electrode of the electric welding apparatus 1, it is not necessary to drastically change the apparatus configuration. Moreover, since the form which adjusts the electric potential of the 2nd junction electrode 9 does not need to incorporate a special insulation mechanism, spot welding can be performed immediately after a softening operation is completed.

  As mentioned above, although embodiment which applied the invention made | formed by this inventor was described, this invention is not limited by the description and drawing which make a part of indication of this invention by this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

1: electric welding device, 2: first member, 3: second member, 4: third member, 5: fourth member, 6: through hole, 7: first joining electrode, 8 and 81: first outer peripheral electrode , 9: second junction electrode, 101: side sill, 101a: side sill inner, 101b: side sill outer, 102: hinge pillar, 103: center pillar, 105: side sill reinforcement, 105a: inner reinforcement, 105b: outer reinforcement S1, parts press molding process, S2: car body welding process, S3: car body painting process, S4: assembly process

Claims (3)

A first member containing a first material;
A second member containing a second material weldable to the first material;
An electric welding apparatus that joins a third member that contains a third material different from the first material and the second material and is sandwiched between the first member and the second member,
The third member has a through hole,
The inside of the through hole is a void, or when a fourth member containing a fourth material that can be welded to the first material and the second material is disposed,
A first joining electrode capable of contacting the first member and energized between the first member and the second member;
A first outer peripheral electrode disposed around the first bonding electrode,
Before joining the first member, the second member, and the third member, the first outer peripheral electrode contacts the first member together with the first joint electrode, and energizes between the first joint electrode and the first outer peripheral electrode. ,
Electric welding equipment. A second joining electrode capable of contacting the second member and energized between the first joining electrode;
A second outer peripheral electrode disposed around the second bonding electrode,
Before joining the first member, the second member, and the third member, the second outer peripheral electrode contacts the second member together with the second joint electrode, and energizes between the second joint electrode and the second outer peripheral electrode. ,
The electric welding apparatus according to claim 1. An insulated pressing member that supports the first member and the second member before joining the first member, the second member, and the third member;
The electric welding apparatus according to claim 1 or 2.

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