KR102361298B1 - Electricity resistance welding apparatus - Google Patents

Abstract

The present invention relates to an electric resistance welding apparatus capable of welding both a round bar member and a plate-shaped member. The electric resistance welding apparatus for welding a first object having a plate-like shape and a through-hole formed therein, and a second object having a round bar shape and a welding protrusion on a circumferential surface thereof, comprises: a loading table; a lower electrode device installed on the loading table, wherein a lower portion of the second object is inserted through the through-hole therein and the first object is disposed thereon; an upper electrode device disposed over the lower electrode device with space therebetween; an elevation device for raising or lowering the upper electrode device installed therein, the elevation device having an upper portion of the second object inserted into the upper electrode device when the upper electrode device is raised, thereby making the upper electrode device, the welding protrusion, the first object, and the lower electrode device in contact with each other sequentially and pressing the same; and a control device supplying a constant welding current to the upper electrode device and the lower electrode device when the elevation device presses.

Description

Electric resistance welding equipment {ELECTRICITY RESISTANCE WELDING APPARATUS}

The present invention relates to an electric resistance welding apparatus.

In general, special welding methods such as argon welding or tig welding are used to weld the round bar member and the plate-like member to be welded.

However, conventional argon welding or TIG welding requires not only the use of consumable auxiliary materials such as welding rods, but also requires a lot of highly skilled workers for good welding without welding defects. There is a problem in that productivity is significantly reduced.

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Japanese Patent Application Laid-Open No. Hei 07-148578 (June 13, 1995)

It is an object of the present invention to provide an electric resistance welding apparatus capable of welding a round bar member and a plate member.

In order to achieve the above object, the present invention is an electrical resistance welding apparatus for welding a first to-be-welded object having a plate-like shape and a through hole formed therein, and a second welding object having a round bar shape and a welding protrusion formed on an outer circumferential surface thereof, comprising: a loading table; a lower electrode device installed on the loading table, the lower portion of the second object to be welded passing through the through hole is inserted therein, and the first object to be welded is disposed thereon; an upper electrode device spaced apart from the lower electrode device and disposed above the lower electrode device; An upper electrode device is installed to raise or lower the upper electrode device. When the upper electrode device is lowered, the upper electrode device, the welding protrusion, and the first object to be welded are sequentially inserted by inserting the upper part of the second object to be welded into the upper electrode apparatus. , a lifting device that presses the lower electrode device in contact with it; and a control device for supplying a constant welding current to the upper electrode device and the lower electrode device when the lifting device is pressed, the lower electrode device comprising: a lower support member fixed to the loading table; and a lower electrode member installed on the lower supporting member, the lower electrode member being fixed to the lower supporting member, and a lower electrode holder having a lower portion of the second object to be welded inserted therein; a lower electrode housing into which the lower electrode holder is inserted; and a lower electrode cap coupled to the upper end of the lower electrode holder, through which the lower portion of the second object to be welded passes, and the second object to be welded is disposed on the upper surface.

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In the present invention, the upper electrode device includes an upper support member fixed to the lifting device; and an upper electrode member disposed in a straight line with the lower electrode member and installed on the upper supporting member.

In the present invention, the upper electrode member is fixed to the upper support member, the upper electrode holder is inserted therein the upper portion of the second object to be welded; an upper electrode housing into which the upper electrode holder is inserted; and an upper electrode cap coupled to the lower end of the upper electrode holder, through which the upper part of the second object to be welded passes, and the lower surface of the upper electrode cap is in contact with the welding protrusion.

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In the present invention, the lower electrode member includes: an elastic member disposed inside the lower electrode holder along the longitudinal direction of the lower electrode holder; and a guide bush having a lower end mounted on the upper end of the elastic member, the upper end penetrating the lower electrode cap and exposed to the outside, passing through the through hole and in contact with the welding protrusion, and being pressed by the lifting device.

In the present invention, a cooling water circulation passage may be formed in the upper electrode device and the lower electrode device.

In the present invention, an air passage communicating with the lower supporting member and the lower electrode holder is formed so that air can be introduced into the lower electrode holder.

In the electrical resistance welding apparatus according to the present invention, the upper electrode member and the lower electrode member are pressed into contact with each other in a state where the round bar member and the first and second objects to be welded, which are plate-shaped members, are interposed between the upper electrode device and the lower electrode device, and then there is a constant distance between the electrodes. By passing a welding current, the first and second objects to be welded can be welded to each other by using the resistance heat generated by the contact resistance and the specific resistance of the object to be welded.

In addition, it is possible to reduce the time and cost required for welding work without requiring skill in welding.

In addition, by circulating cooling water through the upper electrode device and the lower electrode device, it is possible to cool the upper electrode member and the lower electrode member in a high temperature state after welding.

In addition, the object to be welded can be easily separated from the lower electrode tab after welding through the elastic member and the guide bush.

In addition, by forcibly injecting air into the lower electrode holder, it is possible to separate the object to be welded from the lower electrode tab and cool the object to be welded at the same time.

1 and 2 are sequentially a block diagram and a front view of an electrical resistance welding apparatus according to an embodiment of the present invention.
3 is a perspective view of a first object to be welded.
4A and 4B are perspective views of a second object to be welded.
FIG. 5 is a side view showing a state in which first and second objects to be welded are disposed on the lower electrode device shown in FIG. 2 .
6A to 6C are a plan view, a cross-sectional view, and a side view of the lower supporting member sequentially shown in FIG. 2 .
FIG. 7 is a cross-sectional view of the lower electrode member shown in FIG. 2 .
8A and 8B are a front view and a side view of the lower electrode housing shown in FIG. 7 sequentially.
9A to 9E are a front view, a bottom view, a plan view, a cross-sectional view, and a side view of the lower electrode holder shown in FIG. 7 sequentially.
10A to 10C are a side view, a plan view, and a cross-sectional view of the lower electrode cap shown in FIG. 7 sequentially.
11A to 11C are a plan view, a cross-sectional view, and a side view of the upper support member sequentially shown in FIG. 2 .
12 is a cross-sectional view of the upper electrode member shown in FIG.
13A to 13E are a front view, a bottom view, a plan view, a cross-sectional view, and a side view of the upper electrode holder shown in FIG. 12 sequentially.
14A and 14B are cross-sectional views illustrating the operating state of the electric resistance welding apparatus shown in FIG. 2, sequentially showing before and after welding.
15 and 16 are a front view and a side view of the lifting device shown in FIG. 2 sequentially.

In order to explain in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the technical idea of the present invention, the most preferred embodiment of the present invention will be described with reference to the accompanying drawings.

First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as possible even if they are indicated on different drawings.

In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In the direction expressed in the content to be described below prior to the detailed description of the present invention, the upper part of "upper" is the direction toward the upper electrode device 160 with reference to the lower electrode device 120 shown in FIG. , “lower” is defined as a direction toward the lower electrode device 120 with respect to the upper electrode device 160 .

Hereinafter, an electric resistance welding apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 16 .

1 and 2 are sequentially a block diagram and a front view of an electrical resistance welding apparatus according to an embodiment of the present invention, FIG. 3 is a perspective view of a first object to be welded, and FIGS. 4A and B are perspective views of a second object to be welded, FIG. 5 is a side view showing a state in which first and second objects to be welded are disposed on the lower electrode device shown in FIG. 2 .

1 to 5, the electrical resistance welding apparatus 100 (hereinafter, referred to as 'welding apparatus') has a plate-like shape and a first to-be-welded object 10 in which a through hole 11 is formed, a round bar shape, and an outer circumferential surface It is an apparatus for welding the second to-be-welded 20 in which the welding protrusion 21 is formed.

The first object to be welded 10 may be a plate-shaped member or various three-dimensional objects having one side of the plate-shaped member.

The second object to be welded 20 is a round bar member, the annular welding protrusion 21 is formed on the outer circumferential surface along the circumference, and the end of the second object to be welded 20 passes through the through hole 11 In this state, the welding protrusion 21 may be in contact with the side surface of the first object 10 to be welded, and welding may be performed.

The welding apparatus 100 is installed on the loading table 110 and the loading table 110, and the lower portion of the second object to be welded 20 that has passed through the through hole 11 is inserted therein, and the It may include a lower electrode device 120 on which the first object to be welded 10 is disposed, and an upper electrode device 160 spaced apart from the lower electrode device 120 and disposed on the lower electrode device 120 . .

In the welding apparatus 100, the upper electrode apparatus 160 is installed to raise or lower the upper electrode apparatus 160, and when the upper electrode apparatus 160 is lowered, the upper electrode apparatus 160 Insert the upper part of the second object to be welded 20 into the inside of the , and press the upper electrode device 160, the welding protrusion 21, the first object to be welded 10, and the lower electrode device 120 in contact with each other in sequence. It may include a lifting device 170 that does.

In addition, the welding device 100 may include a control device 180 for supplying a constant welding current to the upper electrode device 160 and the lower electrode device 120 when the lifting device 170 is pressurized. .

That is, the upper electrode device 160 and the lower electrode device 120 are pressed with the first and second objects to be welded 10 and 20 interposed between the upper electrode device 160 and the lower electrode device 120 . By passing a constant welding current between both electrodes after making contact, the first and second objects to be welded 10 and 20 can be welded to each other using resistance heat generated by the contact resistance and the specific resistance of the object to be welded. The use of consumable subsidiary materials can be excluded.

The loading table 110 is a workbench for fixing the lower electrode device 120 to the upper surface thereof, and as shown in FIG. 5 , a plurality of plate-shaped members may be bolted to each other.

6A to 6C are sequentially plan, cross-sectional and side views of the lower supporting member shown in FIG. 2 , FIG. 7 is a cross-sectional view of the lower electrode member shown in FIG. 2 , and FIGS. 8A and 6B are sequentially shown in FIG. 7 It is a front view and a side view of the lower electrode housing.

9A to 9E are sequentially a front view, a bottom view, a plan view, a cross-sectional view, and a side view of the lower electrode holder shown in FIG. 7 , and FIGS. 10A to 10C are sequential views of the lower electrode cap shown in FIG. 7 . , a plan view, and a cross-sectional view.

6A to 10C , a cooling water circulation path 140 is formed in the upper electrode device 160 and the lower electrode device 120 , and cooling water is supplied to the upper electrode device 160 and the lower electrode device 120 . circulate to cool the upper electrode device 160 and the lower electrode device 120 that are in a high temperature state after welding.

The upper electrode device 160 and the lower electrode device 120 may be manufactured using a metal material having high conductivity, and the lower electrode device 120 has a lower support member fixed to the upper surface of the loading table 110 ( 121), and a lower electrode member 122 installed on the lower supporting member 121 may be included.

The lower support member 121 is a hexahedron, and bolts are fastened to the coupling holes B formed in the corners to be fixed to the loading table 110 .

A cooling water supply passage 131 and a cooling water recovery passage 132 communicating with the side surface and the upper surface of the lower support member 121 are formed inside the lower support member 121, and the side surface of the lower support member 121 Cooling water flowing into the cooling water supply passage 131 through After being cooled again by a cooler), it may be introduced into the cooling water supply passage 131 and repeatedly circulated.

The lower electrode member 122 is fixed to the lower supporting member 121, the lower electrode holder 123 into which the lower portion of the second object to be welded 20 is inserted, and the lower electrode holder 123 therein. may include a lower electrode housing 124 into which is inserted.

In addition, the lower electrode member 122 is coupled to the upper end of the lower electrode holder 123 , and the lower portion of the second object to be welded 20 passes through the lower portion in which the second object to be welded 20 is disposed on the upper surface of the lower electrode member 122 . An electrode cap 125 may be included.

The lower electrode holder 123 has a cylindrical shape with an open upper surface and an empty inside, and the cooling water circulation path 140 is located on both sides of the lower electrode holder 123 with respect to the radial direction of the lower electrode holder 123 . can be formed.

More specifically, the cooling water circulation passage 140 includes an inlet passage 141 communicating the lower surface and the outer circumferential surface of the lower electrode holder 123 , and the lower electrode holder 123 along the longitudinal direction of the lower electrode holder 123 . ) is formed by chamfering on the outer circumferential surface, and the lower end thereof may be formed of a first intermediate passage 142 connected to the first inlet passage 141 .

In addition, the cooling water circulation passage 140 is recessed in the outer circumferential surface of the lower electrode holder 123 along the circumference of the lower electrode holder 123 and is connected to the upper end of the first intermediate flow passage 142 ( 143) can be achieved.

And, the cooling water circulation passage 140 is formed by chamfering the outer peripheral surface of the lower electrode holder 123 along the longitudinal direction of the lower electrode holder 123 so as to face the first intermediate passage 142, and the upper end is A second intermediate passage 144 connected to the connection passage 143, and a terminal passage 145 connected to the lower end of the second intermediate passage 144 by communicating with the lower surface and outer peripheral surface of the lower electrode holder 123 can be done

That is, the cooling water flows into the inlet passage 141 through the cooling water supply passage 131 and sequentially the first intermediate passage 142, the connecting passage 143, the second intermediate passage 144, and the end passage. After cooling the lower electrode member 122 while flowing along 145 , it may flow out through the cooling water recovery passage 132 to the outside.

A plurality of coupling holes (B) corresponding to each other are formed on the lower surface of the lower electrode holder (123) and the upper surface of the lower support member (121), and bolts are fastened to the coupling holes (B), so that the lower electrode holder ( 123 ) may be fixed to the lower support member 121 .

The lower electrode housing 124 has a cylindrical shape with both sides open and an empty inside, and the lower electrode housing 124 is located at both ends of the lower electrode housing 124 with reference to the first intermediate passage 142 and the second intermediate passage 144 . A sealing groove 126 is formed on the inner circumferential surface of the lower electrode housing 124 along the circumference of the electrode housing 124 , and a sealing member 127 such as an O-ring may be inserted into the sealing groove 126 .

That is, when the lower electrode holder 123 is inserted into the lower electrode housing 124 , the first and second intermediate flow paths 142 and 144 between the inner peripheral surface of the lower electrode housing 124 and the outer peripheral surface of the lower electrode holder 123 . ) and a connection passage 143 may be formed.

In addition, the sealing member 127 may be in close contact with the outer circumferential surface of the lower electrode holder 123 to maintain airtightness.

A locking protrusion 128 is formed on the inner peripheral surface of the lower electrode housing 124 along the circumference of the lower electrode housing 124 at the upper end of the lower electrode housing 124 , and at the upper end of the lower electrode holder 123 , A stopper 129 may protrude from the outer peripheral surface of the lower electrode holder 123 along the circumference of the lower electrode holder 123 .

That is, when the lower electrode holder 123 is inserted into the lower electrode housing 124 , the stopper 129 comes into contact with the locking protrusion 128 and is caught, so that the lower electrode holder 123 is the lower electrode. It can be prevented from being separated from the housing 124 .

Corresponding coupling holes B are formed at the lower ends of the lower electrode housing 124 and the lower electrode holder 123 , and bolts are fastened to the coupling holes B to secure the lower electrode housing 124 and the lower electrode. The holders 123 may be fixed to each other.

The lower electrode member 122 has an elastic member 133 disposed inside the lower electrode holder 123 along the longitudinal direction of the lower electrode holder 123 , and the lower end is mounted on the upper end of the elastic member 133 . The upper end of the guide bush 134 penetrates the lower electrode cap 125 and is exposed to the outside, passes through the through hole 11 and comes into contact with the welding protrusion 21 and is pressed by the lifting device 170 . ) may be further included.

The elastic member 133 may be, for example, a compression spring, and the guide bush 134 has a cylindrical shape with both sides open. A seating protrusion 135 is formed so that the seating protrusion 135 may be mounted on the upper end of the elastic member 133 .

Threads are formed on the lower outer peripheral surface of the lower electrode cap 125 and the upper inner peripheral surface of the lower electrode holder 123 so that the lower electrode cap 125 is coupled to the lower electrode holder 123, and the lower electrode cap ( The seating protrusion 135 may be disposed between the lower end of the 125 and the upper end of the elastic member 133 .

A hook 136 is formed on the bottom surface of the lower electrode holder 123 , and the lower end of the elastic member 133 is fixed to the hook 136 , so that the elastic member 133 is attached to the lower electrode holder 123 . It can be stably fixed inside.

The diameter of the through hole 11 and the inner diameter of the lower electrode cap 125 correspond to the outer diameter of the guide bush 134 , and the upper end of the guide bush 134 passes through the through hole 11 . The first object to be welded 10 may be disposed on the upper surface of the lower electrode cap 125 .

And, when the guide bush 134 is pressed downward by the upper electrode device 160, the elastic member 133 is compressed and deformed, and when the external force applied to the guide bush 134 after welding is released, the elastic member 133 is restored to its original state so that the guide bush 134 pushes the welding protrusion 21 upward to facilitate the first and second welding objects 10 and 20 from the upper surface of the lower electrode cap 125 . can separate it.

In the welding apparatus 100 , an air flow path 150 communicating with the lower supporting member 121 and the lower electrode holder 123 is formed so that air can be introduced into the lower electrode holder 123 .

As the air passage 150 , an air supply passage 151 communicating with a side surface and an upper surface of the lower support member 121 is formed inside the lower support member 121 , and the air supply passage 151 and An air injection passage 152 that is connected and communicates with the lower surface of the lower electrode holder 123 and the inside may be formed.

That is, air flows along the air supply passage 151 and the air injection passage 152 and is injected into the lower electrode holder 123, thereby removing the welded first and second objects 10 and 20 to be welded. By pushing upward, the first and second objects to be welded 10 and 20 can be easily separated from the upper surface of the lower electrode cap 125 , and the first and second objects to be welded 10 and 20 can be cooled. .

11A to 11C are a plan view, a cross-sectional view, and a side view of the upper supporting member sequentially shown in FIG. 2 , FIG. 12 is a cross-sectional view of the upper electrode member shown in FIG. 2 , and FIGS. 13A to 13E are sequentially shown in FIG. 12 . It is a front view, a bottom view, a plan view, a cross-sectional view, and a side view of the upper electrode holder shown.

11A to 13E , the upper electrode device 160 is disposed in a straight line with the upper support member 161 fixed to the lifting device 170 and the lower electrode member 122 and the upper support member It may include an upper electrode member 162 installed on the 161 .

The upper electrode member 162 is fixed to the upper support member 161, the upper electrode holder 163 into which the upper portion of the second object to be welded 20 is inserted, and the upper electrode holder 163 therein. may include an upper electrode housing 164 into which is inserted.

In addition, the upper electrode member 162 is coupled to the lower end of the upper electrode holder 163 , and the upper electrode cap 165 through which the upper portion of the second object to be welded 20 passes through and the lower surface is in contact with the welding protrusion 21 . ) may be included.

The upper electrode device 160 has the same structure as the lower electrode device 120 except for the air passage 150 , the guide bush 134 , and the elastic member 133 , and thus a detailed description thereof will be omitted.

14A and 14B are cross-sectional views showing the operating state of the electric resistance welding apparatus shown in FIG. 2, sequentially showing before and after welding.

The operation of the welding apparatus is as follows with reference to FIGS. 14A and 14B .

First, the upper end of the guide bush 134 passes through the through hole 11 so that the first object to be welded 10 is disposed on the upper surface of the lower electrode cap 125 , and the second object to be welded 20 is disposed on the upper surface of the lower electrode cap 125 . is disposed inside the lower electrode holder 123 through the guide bush 134 , and the welding protrusion 21 is in contact with the upper end of the guide bush 134 .

Thereafter, the control device 180 drives the lifting device 170 to lower the upper electrode device 160 so that the upper portion of the second object to be welded 20 passes through the upper electrode cap 165 . It is disposed inside the upper electrode holder 163 .

Furthermore, as the upper electrode cap 165 comes into contact with the welding protrusion 21 and the guide bush 134 is pressed, the elastic member 133 is compressively deformed.

Thereafter, the control device 180 may apply a constant welding current between the upper electrode device 160 and the lower electrode device 120 to weld the first and second objects to be welded 10 and 20 to each other.

Thereafter, when the control device 180 drives the lifting device 170 to lift the upper electrode device 160 to release the external force applied to the guide bush 134 , the elastic member 133 returns to its original state. The first and second objects 10 and 20 to be welded may be separated from the lower electrode cap 125 by injecting air into the lower electrode holder 123 through the air passage 150 .

15 and 16 are a front view and a side view of the lifting device shown in FIG. 2 sequentially.

15 and 16, the lifting device 170 includes a fixing plate 171 on which the upper support member 161 is installed, a bracket 172 on one side of which an end of the fixing plate 171 is installed, A pair of rails 173 disposed on both sides of the bracket 172 along the elevation direction of the upper electrode device 160 may be included.

In addition, the lifting device 170 includes a pair of motors 174 installed at both ends of the bracket 172 , and teeth 173a fixed to the rotation shaft of the motor 174 and formed on both sides of the rail 173 . ) may include a pair of gears 175 meshing with each other.

The upper support member 161 may be bolted to the lower surface of the fixing plate 171 to be fixed, and the teeth 173a are on the inner surface of the rail 173 along the longitudinal direction of the rail 173 . can be formed.

The motor 174 includes a first motor 174a disposed on one side of the bracket 172 and a second motor 174b disposed on the other side of the bracket 172 , and the gear 175 is the It may include a first gear 175a fixed to the rotation shaft of the first motor 174a and a second gear 175b fixed to the rotation shaft of the second motor 174b.

That is, the first gear 175a and the second gear 175b rotate in the forward direction so that the upper electrode device 160 descends, and the first gear 175a and the second gear 175b rotate in the reverse direction. Accordingly, the upper electrode device 160 may rise.

As described above, in the electrical resistance welding apparatus according to an embodiment of the present invention, the upper electrode member and the lower electrode member are interposed between the upper electrode device and the lower electrode device, with the round bar member and the first and second objects to be welded being plate-shaped members being interposed therebetween. The first and second objects to be welded can be welded to each other by using the resistance heat generated by the contact resistance and the specific resistance of the object itself by passing a constant welding current between the electrodes after making pressurized contact, so it is possible to reduce the consumption of auxiliary materials such as welding rods. use can be excluded.

In addition, it is possible to reduce the time and cost required for welding work without requiring skill in welding.

In addition, by circulating cooling water through the upper electrode device and the lower electrode device, it is possible to cool the upper electrode member and the lower electrode member in a high temperature state after welding.

In addition, the object to be welded can be easily separated from the lower electrode tab after welding through the elastic member and the guide bush.

In addition, by forcibly injecting air into the lower electrode holder, it is possible to separate the object to be welded from the lower electrode tab and cool the object to be welded at the same time.

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are only used for the purpose of describing the present invention and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

100: electric resistance welding device 110: loading table
120: lower electrode device 160: upper electrode device
170: elevating device 180: control device

Claims (8)

In the electric resistance welding apparatus for welding a first to-be-welded object in the form of a plate and having a through hole formed therein, and a second object to be welded in the form of a round bar and having a welding protrusion formed on an outer circumferential surface thereof,
loading table;
a lower electrode device installed on the loading table, the lower portion of the second object to be welded passing through the through hole being inserted thereinto, and the first object to be welded being disposed thereon;
an upper electrode device spaced apart from the lower electrode device and disposed above the lower electrode device;
The upper electrode device is installed to raise or lower the upper electrode device, and when the upper electrode device is lowered, the upper electrode device is sequentially welded by inserting the upper part of the second object to be welded into the upper electrode device. a lifting device for pressing the protrusion, the first object to be welded, and the lower electrode device in contact with the lower electrode device; and
a control device for supplying a constant welding current to the upper electrode device and the lower electrode device when the lifting device is pressurized;
including,
The lower electrode device,
a lower support member fixed to the loading table; and
a lower electrode member installed on the lower supporting member;
including,
The lower electrode member,
a lower electrode holder fixed to the lower supporting member and having a lower portion of the second object to be welded inserted therein;
a lower electrode housing into which the lower electrode holder is inserted; and
a lower electrode cap coupled to the upper end of the lower electrode holder and having the second object to be welded disposed on the upper surface through which the lower portion of the second object to be welded passes;
Electrical resistance welding device comprising a.
delete The method of claim 1,
The upper electrode device,
an upper support member fixed to the elevating device; and
an upper electrode member disposed in a straight line with the lower electrode member and installed on the upper supporting member;
Electrical resistance welding device comprising a.
delete 4. The method of claim 3,
The upper electrode member,
an upper electrode holder fixed to the upper support member and having an upper portion of the second object to be welded inserted therein;
an upper electrode housing into which the upper electrode holder is inserted; and
an upper electrode cap coupled to a lower end of the upper electrode holder, through which an upper portion of the second object to be welded passes, and a lower surface of the upper electrode cap is in contact with the welding protrusion;
Electrical resistance welding device comprising a.
The method of claim 1,
The lower electrode member,
an elastic member disposed inside the lower electrode holder along the longitudinal direction of the lower electrode holder; and
a guide bush having a lower end mounted on the upper end of the elastic member, an upper end exposed to the outside through the lower electrode cap, passing through the through hole, and being pressed by the lifting device in contact with the welding protrusion;
Electrical resistance welding device further comprising a.
The method of claim 1,
The upper electrode device and the lower electrode device,
An electric resistance welding device in which a cooling water circulation path is formed.
The method of claim 1,
An electric resistance welding apparatus in which an air passage communicating with the lower supporting member and the lower electrode holder is formed to introduce air into the lower electrode holder.

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