KR101923667B1 - Electric resistance spot welding machine with double composite electrode tips - Google Patents
Electric resistance spot welding machine with double composite electrode tips Download PDFInfo
- Publication number
- KR101923667B1 KR101923667B1 KR1020170077301A KR20170077301A KR101923667B1 KR 101923667 B1 KR101923667 B1 KR 101923667B1 KR 1020170077301 A KR1020170077301 A KR 1020170077301A KR 20170077301 A KR20170077301 A KR 20170077301A KR 101923667 B1 KR101923667 B1 KR 101923667B1
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- South Korea
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- electrode tip
- spot
- spot welding
- electrode
- metal plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/20—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of different metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/3009—Pressure electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/3054—Cooled electrodes
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
Abstract
The present invention relates to an electric resistance spot welder having a double composite electrode tip, wherein an electric resistance spot welder having a double composite electrode tip according to the present invention includes a first metal plate and a second metal plate superimposed thereon, The spot welding rod includes a first spot welding support bar in the form of a rod, which is supplied with power from a first power supply unit, and a second spot welding rod A second spot welded support rod in the form of a rod receiving power from a second power supply and receiving the first spot welded support bar so as to be spaced apart from the first spot welded support bar, a first electrode tip coupled to an end of the first spot welded support bar, And a second electrode tip coupled to an end of the welding support rod and receiving the first electrode therein .
Description
The present invention relates to an electric resistance spot welder having a double composite electrode tip, and more particularly, to an electric resistance spot welder having a double composite electrode which welds two metal plates by melting a contact surface at a predetermined position between metal plates in a state in which metal plates of different materials are overlapped, To an electric resistance spot welder having an electrode tip.
Electrical resistance spot welding is a technique of melting and welding the contact surfaces of two metal plates by heat generated by contact resistance at the contact surfaces between the metal plates by energizing a large amount of current by using electrodes on a part of two overlapping metal plates. This is a relatively tricky technique in which the welding characteristics such as the size, time, and pressing conditions of the current to be welded must be controlled according to the state of the contact surface.
The use of non-ferrous metals is increasing due to the weight reduction of automobiles, and therefore spot welding between dissimilar metal plates between a conventional steel plate and a lightweight non-ferrous metal plate is required. However, in the case of spot welding by electrical resistance heat in the existing contact surface, it is difficult to spot weld the dissimilar metal plate due to the difference in melting temperature of the dissimilar metal plate to be welded, as compared with the heat generated by the contact resistance.
SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an electrode for heating a welding portion by resistance heating of an electrode, A spot electrode having a double composite electrode tip including a tip is used to control the shape of the electrode tip, the amount of current supplied to the electrode tip, or the shape of the electrode tip according to the type and thickness of the dissimilar metal plate to enable spot welding of the dissimilar metal plate And an electric resistance spot welder having a double composite electrode tip.
The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.
According to the present invention, there is provided an electric resistance spot detecting method comprising the steps of: placing a first metal plate material and a second metal plate material overlapping each other in a space therebetween and having a spot electrode having an electrode formed at one end thereof in contact with the metal plate material; In the welding machine, the spot electrode includes a first spot welding support bar in the form of a bar supplied with power from the first power supply unit; A second spot welding support bar in the form of a rod receiving power from a second power supply and receiving the first spot welding support bar so as to be spaced apart from the first spot welding support bar; A first electrode tip coupled to an end of the first spot weld support bar; And a second electrode tip coupled to an end of the second spot weld support bar and receiving the first electrode therein.
Here, the first spot welding support bar and the second spot welding support bar may each be formed of a cylindrical bar, and the first spot welding support bar may be disposed concentrically within the second spot welding support bar.
The first electrode tip may be formed with an indentation groove at an end thereof so that the groove of the indentation may be extrapolated to an end of the first spot welding support rod so that the first electrode tip may be coupled to the first spot welding support rod .
Here, a first inclined surface is formed on the outer surface of the end portion of the first spot welding support rod, and a second inclined surface corresponding to the first inclined surface is formed on the inner surface of the recessed groove of the first electrode tip, .
Here, the end of the second electrode tip may be inserted into the inner surface of the end portion of the second spot welding support rod, and the second electrode tip may be coupled to the second spot welding support rod.
A fourth inclined surface corresponding to the third inclined surface may be formed on an end surface of the end portion of the second electrode tip so as to be inserted and coupled to the inner surface of the end portion of the second spot welding support rod.
A circular rod having a circular protruding section is formed in the lower part of the first electrode tip, and one end face of the circular rod of the first electrode tip is exposed under the second electrode tip, A hole through which the rod is inserted can be formed.
Here, when the first spot welding electrode and the second spot welding electrode, which are disposed opposite to both sides of the overlapped metal plate, contact both surfaces of the metal plate, the first spot welding of the first power supply unit, A first electrode tip of the first spot-welding electrode, a first spot-welding support bar of the second spot-welding electrode, and a first waste-welding support rod of the first spot- A second electrode tip of the first spot welding electrode, a second electrode tip of the second spot welding electrode, a second spot welding electrode of the first spot welding electrode, And a second waste electrical circuit connected to the second power supply unit in order.
Here, the first spot welding support rod may further include a cooling water inlet tube into which a sealed cooling water space for injecting cooling water is inserted, and a coolant injection pipe inserted into the cooling water space to inject cooling water.
Here, one end surface of the first electrode tip and one end surface of the second electrode tip can simultaneously contact the metal plate.
Here, the second electrode tip is formed of a material having a high resistance value, and when the current flows through the second power supply unit, resistance heat is generated to heat the metal plate.
Here, the strength of the power supplied from the first power supply unit and the second power supply unit, the material of the first electrode tip and the second electrode tip, or the material of the first electrode tip and the second electrode tip, It is possible to perform spot welding with respect to different types of metal plate by changing at least one of the contact area and the contact area.
According to the present invention, the above object can also be achieved by a plasma processing apparatus comprising a spot electrode having a first metal plate and a second metal plate superimposed thereon and having an electrode formed at one end thereof in contact with the metal plate, In the resistance spot welding machine, the spot electrode includes a rod-shaped spot welding support rod supplied with power from a power supply unit; A first electrode tip coupled to an end of the spot weld support bar; And a second electrode tip coupled to an end of the spot weld support bar and receiving the first electrode tip therein.
Here, the spot welding support bar may have an annular groove formed at an end of the spot welding support rod, and the first electrode tip and the second electrode tip may be coupled to the annular groove.
The first electrode tip is formed with an engraved groove at an end thereof and the groove of the engraved first electrode tip is extrapolated to an inner side face of the annular groove so that the first electrode tip is coupled to the spot welding support rod .
Here, the end of the second electrode tip may be inserted into the outer side surface of the annular groove, and the second electrode tip may be coupled to the spot welding support rod.
According to the present invention, the above object can also be achieved by a plasma processing apparatus comprising a spot electrode having a first metal plate and a second metal plate superimposed thereon and having an electrode formed at one end thereof in contact with the metal plate, In the resistance spot welding machine, the spot electrode includes a rod-shaped spot welding support rod supplied with power from a power supply unit; A connection portion coupled to the spot welding support bar; A first electrode tip coupled to an end of the spot weld support bar; And a second electrode tip coupled to an end of the connection and receiving the first electrode tip therein.
The connection portion is formed with a hollow and is coupled to an outer circumferential surface of the spot welding support rod and extends to surround and surround the end portion of the end portion of the spot welding support rod to form an annular groove at an end of the spot welding support rod and the connection portion, And the first electrode tip and the second electrode tip may be coupled to the annular groove.
In this case, a side slope is formed on the outer circumferential surface of the spot welding support bar, and an inner slope corresponding to the side slope is formed in the hollow inner side of the connection portion where the hollow is inserted to be inserted into the spot welding support rod, Can be inserted and bonded.
The first electrode tip is formed with an engraved groove at an end thereof and the groove of the engraved first electrode tip is extrapolated to an inner side face of the annular groove so that the first electrode tip is coupled to the spot welding support rod .
Here, the end of the second electrode tip may be inserted into the outer side surface of the annular groove, and the second electrode tip may be coupled to the connection portion.
A circular rod having a circular protruding section is formed in the lower part of the first electrode tip, and one end face of the circular rod of the first electrode tip is exposed under the second electrode tip, A hole through which the rod is inserted can be formed.
Here, a first inclined surface is formed on the inner side surface of the annular groove, and a second inclined surface corresponding to the first inclined surface is formed on the inner side surface of the depressed portion of the first electrode tip.
Here, a third inclined surface is formed on the outer side surface in the annular groove, and a fourth inclined surface corresponding to the third inclined surface is formed on the outer surface of the end of the second electrode tip.
In this case, the spot welding support rod may further include a cooling water inlet tube into which a sealed cooling water space for injecting cooling water is inserted, and a cooling water injection pipe inserted into the cooling water space to inject cooling water.
Here, one end surface of the first electrode tip and one end surface of the second electrode tip can simultaneously contact the metal plate.
Here, the second electrode tip is formed of a material having a high resistance value, and when the current flows through the second power supply unit, resistance heat is generated to heat the metal plate.
According to the electric resistance spot welder having the double composite electrode tip of the present invention as described above, it is possible to perform spot welding with respect to the dissimilar metal plate material.
Further, the amount of current supplied to each electrode tip constituting the double composite electrode tip is controlled to be different from each other, and the spot weldability of the dissimilar metal plate material is controlled in accordance with the difference in amount of current supplied to each electrode tip, There is an advantage that the spot welding can be easily performed.
Further, since the double composite electrode tip can be easily replaced, the spot weldability of the dissimilar metal plate can be controlled by changing the material constituting the double composite electrode tip or adjusting the contact area with the metal plate according to the shape of the electrode, There is an advantage that spot welding can be easily performed with respect to the welding wire.
1 is a cross-sectional view showing a spot electrode of an electric resistance spot welder having a double composite electrode tip according to an embodiment of the present invention, disposed on both sides of a metal plate.
Fig. 2 is a partially cutaway perspective view of the double spot welding support bar of Fig. 1;
3 is a partially cutaway perspective view of the first electrode tip of FIG.
4 is a partially cutaway perspective view of the second electrode tip of FIG.
5 is a partially cutaway perspective view showing a state where the first electrode tip and the second electrode tip are coupled to the double spot welding support rod.
Fig. 6 is a front view of Fig. 5 showing the contact surface of the double composite electrode tip with the metal plate. Fig.
FIG. 7 is a view showing a flow of a double current when spot welding is performed using an electric resistance spot welder having a double composite electrode tip according to an embodiment of the present invention.
8 is a view illustrating a process of performing welding using an electric resistance spot welder having a double composite electrode tip according to an embodiment of the present invention.
9 is a cross-sectional view of a spot welding rod of an electric resistance spot welder having a double composite electrode tip according to another embodiment of the present invention.
Fig. 10 is a sectional view showing a modification of Fig. 9. Fig.
The details of the embodiments are included in the detailed description and the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
Hereinafter, the present invention will be described with reference to the drawings for explaining an electric resistance spot welder having a double composite electrode tip according to embodiments of the present invention.
FIG. 1 is a cross-sectional view showing a spot electrode of an electric resistance spot welder having a double composite electrode tip according to an embodiment of the present invention disposed on both sides of a metal plate, FIG. 2 is a cross- 1 is a partial cutaway perspective view of the first electrode tip of FIG. 1, FIG. 4 is a partially cutaway perspective view of the second electrode tip of FIG. 1, FIG. 5 is a partial cutaway perspective view of the first electrode tip of FIG. FIG. 6 is a front view of FIG. 5 showing a contact surface of a double composite electrode tip with a metal plate, FIG. 7 is a cross-sectional view of a double- Fig. 5 is a diagram showing the flow of a double current when spot welding is performed using an electric resistance spot welder having a composite electrode tip. Fig.
The spot welding rod 100 of the electric resistance spot welder having the double composite electrode tip according to an embodiment of the present invention includes a first spot
The first spot
The first spot
The second spot
1 and 2, the second spot
The
At this time, as shown in the drawing, the outer surface of the lower end portion of the first spot
A
The
A
As shown in the drawing, the upper end of the
At this time, the inner surface of the lower end of the second spot
Since the
7, by using the overlapped
Therefore, since different power sources can be supplied from the first power supply unit and the second power supply unit to the inner first spot
At this time, the material of the
Hereinafter, the operation of performing the spot welding using the electric resistance spot welder having the above-described double composite electrode tip will be described.
8 is a view illustrating a process of performing welding using an electric resistance spot welder having a double composite electrode tip according to an embodiment of the present invention.
The
The first
Next, a large amount of power is supplied from the second power supply unit to the second spot
Accordingly, when current flows through the
Next, a large amount of power is supplied from the first power supply unit to the first spot
At this time, the contact resistance heat generated by the
As described above, in the present invention, the magnitude of the current flowing from the
The
In addition, the size of the cross-sectional area of the
Hereinafter, an electric resistance spot welder having a double composite electrode tip according to another embodiment of the present invention will be described.
FIG. 9 is a cross-sectional view of a spot electrode of an electric resistance spot welder having a double composite electrode tip according to another embodiment of the present invention, and FIG. 10 is a cross-sectional view showing a modification of FIG.
Similar to the above embodiment, in this embodiment, spot welding is performed by two
Hereinafter, the description of the present embodiment will be focused on differences from the above-described embodiments with reference to Figs. 1 to 7.
In the above embodiment, the
The
The shape of the
The
When a large amount of power is supplied from the power supply unit connected to the spot
In this way, the heat generated by the
Fig. 10 shows a modification of Fig. 9. As in the above-described embodiment, in this embodiment as well, two spots, which are in contact with each other between the overlapped
The
The inner side surface of the connecting
Therefore, in this embodiment, the electric resistance spot welder of the double electrode according to the present invention can be easily formed by attaching the connecting
The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
100: Spot electrode 100a: First spot electrode
100b: second spot welding rod 110: first spot welding support rod
111: slope 112: cooling water space
114: cooling water injection tube 120: second spot welding support rod
121: sloped surface 130: first electrode tip
131: sloped surface 132: groove
134: round rod 135: first electrode tip contact surface
140: second electrode tip 141: inclined surface
142: groove 144: hole
145: second electrode tip contact surface 150: spot welding support rod
152: groove 153: inner side surface in the groove, inclined surface
154: outer side surface in the groove, inclined surface 160: spot welding support rod
162: groove 163: inclined surface
164: connecting portion 165: inclined surface
200:
200b: second metal plate material
Claims (27)
The spot electrode
A first spot welding support bar in the form of a bar that receives power from the first power supply;
A second spot welding support bar in the form of a rod receiving power from a second power supply and receiving the first spot welding support bar so as to be spaced apart from the first spot welding support bar;
A first electrode tip coupled to an end of the first spot weld support bar; And
And a second electrode tip coupled to an end of the second spot weld support bar for receiving the first electrode tip therein,
And a double composite electrode tip capable of individually controlling a current supplied to the first electrode tip from the first power supply unit and a current supplied to the second electrode tip from the second power supply unit.
Wherein the first spot welding support bar and the second spot welding support bar are each formed of a cylindrical bar and the first spot welding support rods are disposed concentrically within the second spot welding support bar, .
Wherein the first electrode tip is formed with a recessed groove at an end of the first electrode tip to extrude the recess of the first spot welded support rod at an end of the first spot welded support rod and the first electrode tip is coupled to the first spot welded support rod, Wherein the electric resistance spot welder has an electric resistance.
A first inclined surface is formed on the outer surface of the end portion of the first spot welding support rod and a second inclined surface corresponding to the first inclined surface is formed on the inner side surface of the depressed portion of the first electrode tip, Wherein the electric resistance spot welder has an electric resistance.
And an end of the second electrode tip is inserted into an inner surface of the end portion of the second spot welding support rod, and the second electrode tip is coupled to the second spot welding support rod.
A second electrode tip having a third inclined surface formed on the inner surface of the end portion of the second spot welding support rod and a fourth inclined surface corresponding to the third inclined surface formed on the outer surface of the end portion of the second electrode tip, Electric resistance spot welder.
A circular rod having a circular cross-section is formed on the bottom of the first electrode tip,
And a hole for inserting the circular rod is formed in the lower portion of the second electrode tip so that the one end face of the circular rod of the first electrode tip is exposed to contact the metal plate.
When the first spot electrode and the second spot electrode, which are disposed opposite to both sides of the overlapped metal plate, contact both surfaces of the metal plate,
A first electrode tip of the first spot electrode; a first electrode tip of the first spot electrode; a second electrode tip of the second spot electrode; a first spot weld of the second spot electrode; And a first power supply circuit connected in series to the first power supply unit,
A second electrode tip of the first spot welding electrode; a second electrode tip of the second spot welding electrode; a second spot welding of the second spot welding electrode; An electrical resistance spot welder having a double composite electrode tip constituting a second closed electrical circuit connected in series with the support bar and the second power supply.
The electric resistance spot welder according to any one of claims 1 to 5, further comprising: a cooling water inlet tube for injecting cooling water into the cooling water space.
Wherein the one end surface of the first electrode tip and the one end surface of the second electrode tip simultaneously contact the metal plate.
And the second electrode tip has a double-composite electrode tip for heating the metal plate by generating resistance heat when a current is supplied from the second power supply unit.
Wherein the strength of the power supplied from the first power supply unit and the second power supply unit, the material of the first electrode tip and the second electrode tip, or the material of the first electrode tip and the second electrode tip are in contact with the metal plate And a width of the contact area, and performing spot welding with respect to different types of metal plate members.
The spot electrode
A rod-shaped spot welding support rod supplied with power from a power supply unit;
A first electrode tip coupled to an end of the spot weld support bar; And
And a second electrode tip coupled to an end of the spot welding support bar for receiving the first electrode tip therein,
Wherein the spot welding support bar has an annular groove formed at an end of the spot welding support rod and a double composite electrode tip in which the first electrode tip and the second electrode tip are coupled to the annular groove.
Wherein the first electrode tip is formed with a recessed groove at an end thereof and the grooved groove of the first electrode tip is extrapolated at an inner side surface of the annular groove and the first electrode tip is coupled to the spot welding support rod An electrical resistance spot welder having a composite electrode tip.
Wherein an end of the second electrode tip is inserted into the annular groove outer side surface and the second electrode tip is coupled to the spot welding support rod.
The spot electrode
A rod-shaped spot welding support rod supplied with power from a power supply unit;
A connection portion coupled to the spot welding support bar;
A first electrode tip coupled to an end of the spot weld support bar; And
And a second electrode tip coupled to an end of the connection portion and receiving the first electrode tip therein,
Wherein the connection portion is formed with a hollow and is coupled to an outer circumferential surface of the spot welding support rod and extends to surround and surround the end portion of the end portion of the spot welding support rod to form an annular groove at an end of the spot welding support rod and the connection portion, Wherein the first electrode tip and the second electrode tip are coupled to a groove of the second electrode tip.
The inner surface of the hollow portion of the connection portion where the hollow is inserted to be inserted into the spot welding support bar is formed with an inner inclined surface corresponding to the side inclined surface, ≪ / RTI > having a double composite electrode tip.
Wherein the first electrode tip is formed with a recessed groove at an end thereof and the grooved groove of the first electrode tip is extrapolated at an inner side surface of the annular groove and the first electrode tip is coupled to the spot welding support rod An electrical resistance spot welder having a composite electrode tip.
Wherein an end of the second electrode tip is inserted into an outer side surface of the annular groove and the second electrode tip is coupled to the connection portion.
A circular rod having a circular cross-section is formed on the bottom of the first electrode tip,
And a hole for inserting the circular rod is formed in the lower portion of the second electrode tip so that the one end face of the circular rod of the first electrode tip is exposed to contact the metal plate.
And a second inclined surface corresponding to the first inclined surface is formed on the inner side surface of the depressed portion of the first electrode tip so as to be inserted and coupled to the inner surface of the annular groove, Resistance spot welder.
A third inclined surface is formed on the outer side surface in the annular groove, and a fourth inclined surface corresponding to the third inclined surface is formed on the outer surface of the end of the second electrode tip, Spot welder.
And a cooling water injection tube for injecting cooling water inserted into the cooling water space, wherein the cooling water space is formed in the inside of the spot welding support rod for injecting cooling water.
Wherein the one end surface of the first electrode tip and the one end surface of the second electrode tip simultaneously contact the metal plate.
Wherein the second electrode tip has a double composite electrode tip for heating the metal plate by generating resistance heat when a current flows through the power supply unit.
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KR1020170077301A KR101923667B1 (en) | 2017-06-19 | 2017-06-19 | Electric resistance spot welding machine with double composite electrode tips |
PCT/KR2017/011528 WO2018235998A1 (en) | 2017-06-19 | 2017-10-18 | Electric resistance spot welder having double composite electrode tip |
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KR1020170077301A KR101923667B1 (en) | 2017-06-19 | 2017-06-19 | Electric resistance spot welding machine with double composite electrode tips |
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Citations (2)
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KR100902767B1 (en) * | 2008-01-02 | 2009-06-15 | 한종공업 주식회사 | Spot welding machine with preventing overheating of cooling water for nut |
JP2010082665A (en) * | 2008-09-30 | 2010-04-15 | Neturen Co Ltd | Welding apparatus for metallic material |
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JPH06179082A (en) * | 1992-12-14 | 1994-06-28 | Furukawa Alum Co Ltd | Double action type resistance spot welding electrodes |
KR101404288B1 (en) * | 2012-09-03 | 2014-06-05 | 진인태 | Spot Welding Machine with Auxiliary Heating Electrode and Spot Welding Method using the Electrodes |
KR101545856B1 (en) * | 2014-01-21 | 2015-08-20 | 주식회사 성우하이텍 | Device and method of vibro-spot welding |
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KR100902767B1 (en) * | 2008-01-02 | 2009-06-15 | 한종공업 주식회사 | Spot welding machine with preventing overheating of cooling water for nut |
JP2010082665A (en) * | 2008-09-30 | 2010-04-15 | Neturen Co Ltd | Welding apparatus for metallic material |
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