WO1998018592A1 - Apparatus for holding and resistance butt welding portions of at least one part together - Google Patents

Apparatus for holding and resistance butt welding portions of at least one part together Download PDF

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Publication number
WO1998018592A1
WO1998018592A1 PCT/US1997/016882 US9716882W WO9818592A1 WO 1998018592 A1 WO1998018592 A1 WO 1998018592A1 US 9716882 W US9716882 W US 9716882W WO 9818592 A1 WO9818592 A1 WO 9818592A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductors
clamping
resilient conductors
core
resilient
Prior art date
Application number
PCT/US1997/016882
Other languages
French (fr)
Inventor
John F. Farrow
Original Assignee
Medar, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Medar, Inc. filed Critical Medar, Inc.
Publication of WO1998018592A1 publication Critical patent/WO1998018592A1/en

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Classifications

    • 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
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/241—Electric supplies
    • 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
    • B23K11/02—Pressure butt welding
    • 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
    • B23K11/36—Auxiliary equipment
    • B23K11/362—Contact means for supplying welding current to the electrodes
    • B23K11/364—Clamping contacts

Definitions

  • This invention relates to apparatus for welding and, more particularly, to apparatus for holding and resistance butt welding portions of at least one part together.
  • Welding processes typically require the application of heat or pressure, or both, to produce a bond between end portions of part(s) being joined. Welding usually involves application or development of localized heat near the intended joint.
  • Resistance welding is a method of fusing metal parts together by heating them with large currents and applying pressure to form a fused metal joint between them.
  • the power and energy density of the heat source must be sufficient to accomplish local melting.
  • a flat strip of steel is bent into a hoop, as illustrated at 10 in Figure 1, and the end portions of the bent steel strip 10 are held between pairs of electrodes/clamps 12.
  • the clamps 12 are generally capable of moving relative to one another to not only clamp the end portions of the bent steel strip 10 but also to urge the end portions of the steel strip 10 together as a large electrical current flows between the two end portions, thereby heating the two end portions.
  • the two end portions to be welded together fuse to form a weld joint upon the application of suitable pressure as is well known in the art.
  • the apparatus of Figure 1 typically includes a welding control 14 which receives input power along a three-phase power line labeled LI, L2 and L3.
  • the welding control 14, in turn, supplies inputs HI, H2 and H3 to a three-phase DC power supply 16 generally of the type disclosed in the U.S. patent to Farrow 4,513,363.
  • the power supply 16 typically includes a number of semiconductor diodes to supply DC power at outputs which are coupled to copper bus bars 18. Typically, these bus bars are approximately 12 inches wide and 2 inches thick. At the end of each of the bus bars 18, there is coupled a flexible conductor 20 on a free end of which there is secured one of the clamping electrodes 12.
  • the apparatus of Figure 1 has proven to be useful over the years in welding the end portions of steel to form steel wheels. However, as more and more manufacturers desire to make aluminum wheels, the apparatus of Figure 1 has proven to be less useful .
  • the current required is approximately 250,000 amperes.
  • the voltage required at the power supply 16 is about 12-15 volts. Consequently, it can be seen that the apparatus of Figure 1 requires the power supply 16 to handle a large amount of power . At these large power levels, semiconductor diodes in the power supply 10 are susceptible to damage due to thermal cycling.
  • the U.S. patent to Farrow 4,831,229 discloses a resistance spot welding structure comprising two transformer structures, each containing primary and secondary circuits and electrodes integrally connected to the secondary circuits.
  • An object of the present invention is to provide an apparatus for holding and resistance butt welding portions of at least one part together wherein the power required for such resistance butt welding is substantially reduced from the apparatus of the prior art .
  • Another object of the present invention is to provide an apparatus for holding and resistance butt welding portions of at least one part together wherein relatively expensive and complicated parts of the prior art apparatus can be eliminated such as bus bars and the three-phase power supply including the semiconductors therein.
  • Still another object of the present invention is to provide an apparatus for holding and resistance butt welding portions of at least one part together wherein welding can be accomplished at greatly reduced voltages and wherein the clamping electrodes and the part or parts themselves to be welded form part of secondary loops of the apparatus .
  • an apparatus is provided for holding and resistance butt welding a first end portion to a second end portion of at least one part together.
  • the apparatus includes first and second primary windings, first and second cores inductively coupled to the first and second primary windings, respectively, and a first plurality of resilient conductors inductively coupled to the first core.
  • the first plurality of resilient conductors have first and second clamping electrodes formed at free end portions thereof.
  • the apparatus also includes a second plurality of resilient conductors inductively coupled to the second core.
  • the second plurality of resilient conductors have first and second clamping electrodes formed at free end portions thereof.
  • a first voltage applied across the first primary winding induces a welding voltage at the first and second clamping electrodes of the first plurality of resilient conductors.
  • a second voltage applied across the second primary winding induces a welding voltage at the first and second clamping electrodes of the second plurality of resilient conductors.
  • the first end portion of the at least one part is resilient- ly clamped between the first clamping electrode of the first plurality of resilient conductors and the first clamping electrode of the second plurality of resilient conductors
  • the second end portion of the at least one part is resiliently clamped between the second clamping electrode of the first plurality of resilient conductors and the second clamping electrode of the second plurality of resilient conductors
  • a welding current is produced in the first and second end portions of the at least one part .
  • the first plurality of resilient conductors includes strips of metal conductors and the second plurality of resilient conductors also includes strips of metal conductors .
  • the first core is an iron core and the second core is an iron core.
  • the first core has first and second legs and wherein the first primary winding has a first number of turns about the first leg of the first core and wherein the first plurality of resilient conductors are formed about the second leg of the first core.
  • the second core includes first and second legs and wherein the second primary winding has a second number of turns about the first leg of the second core and wherein the second plurality of resilient conductors are formed about the second leg of the second core .
  • the first clamping electrode of the first plurality of resilient conductors defines a first continuous clamping surface adapted to engage a first surface of the first end portion of the at least one part; the second clamping electrode of the first plurality of resilient conductors defines a second continuous clamping surface adapted to engage a first surface of the second end portion of the at least one part; the first clamping electrode of the second plurality of resilient conductors defines a third continuous clamping surface adapted to engage a second surface of the first end portion of the at least one part; and the second clamping electrode of the second plurality of resilient conductors defines a fourth continuous clamp- ing surface adapted to engage a second surface of the second end portion of the at least one part .
  • FIGURE 1 is a schematic view of a prior art apparatus for holding and resistance butt welding end portions of a part together to form a wheel;
  • FIGURE 2 is a schematic end view illustrating the apparatus of the present invention
  • FIGURE 3 is a schematic side elevational view of the apparatus .
  • FIGURE 4 is a schematic top plan view of the apparatus .
  • FIG. 2-4 there is generally indicated an apparatus for holding and resistance butt welding a first end portion 22 to a second end portion 24 of a curved metal part such as the steel part 10 of Figure 1.
  • the apparatus for holding and resistance butt welding includes first and second primary windings 26 and 28, respectively, for receiving primary power.
  • the apparatus also includes first and second iron cores 30 and 32, respectively, which are inductively coupled to the first and second primary windings 26 and 28, respectively.
  • the iron cores 30 and 32 are in the form of closed loop links.
  • each of the cores 30 and 32 instead of being made of one integral member may be in the form of individual cores for each of first and second pluralities of resilient conductors, generally indicated at 34 and 36, respectively.
  • both the first and second plurali- ty of resilient conductors 34 and 36, respectively, are formed from strips of metal conductors in the same way that the flexible conductors 20 of Figure 1 are formed.
  • the first iron core 30 has first and second legs 29 and 31.
  • the first primary winding 26 has a first number of turns about the first leg 29 and the first plurality of resilient conductors 34 are formed about the second leg 31 of the first core 30.
  • the second iron core 32 has first and second legs 33 and 35, respectively, as shown in Figure 3.
  • the second primary winding 28 has a second number of turns about the first leg 33 and the second plurality of resilient conductors 36 are formed about the second leg 35 by passing through the iron core 32.
  • the first plurality of resilient conductors 34 are inductively coupled to the first core 30.
  • Each of the first plurality of resilient conductors 34 have first and second clamping electrodes 38 and 40 formed at free end portions thereof.
  • the clamping electrodes 38 and 40 may be welded at the free end portions of the resilient conductors 34.
  • the second plurality of resilient conductors 36 are inductively coupled to the second core 32.
  • the second plurality of resilient conductors 36 also have first and second clamping electrodes 42 and 44, respectively, formed at their free end portions.
  • a first voltage applied across the first primary winding 26 induces a welding voltage at the first and second clamping electrodes 38 and 40 of the first plurality of resilient conductors 34.
  • a second voltage applied across the second primary winding 28 induces a welding voltage at the first and second clamping electrodes 42 and 44 of the second plurality of resilient conductors 36.
  • a welding current is produced within the first and second end portions 22 and 24, respectively, of at least one part when the following occurs :
  • the first and second voltages are applied to the first and second primary windings 26 and
  • the first end portion 22 of the at least one part is resiliently clamped between the first clamping electrode 38 of the first plurality of resilient conductors 34 and the first clamping electrode 42 of the second plurality of resilient conductors 36;
  • the second end portion 24 of the at least one part is resiliently clamped between the second clamping electrode 40 of the first plurality of resilient conductors 34 and the second clamping electrode 44 of the second plurality of resilient conductors 36;
  • a force is applied to close the gap between the end portions 22 and 24 of the part.
  • first and second clamping electrodes 38 and 40, respectively, of the resilient conductors 34 define continuous clamping surfaces 46 and 48, respectively.
  • the clamping surface 46 engages a first surface 50 of the first end portion 22 whereas the second clamping surface 48 engages a first surface 52 of the second end portion 24.
  • first clamping electrode 42 of the second plurality of resilient conductors 36 defines a clamping surface 54 adapted to engage a second surface 56 of the free end portion 22.
  • the second clamping electrode 44 of the second plurality of resilient conductors 36 defines a clamping surface 58 adapted to engage a second surface 60 of the second end portion 24 of the part.
  • the conductors 34 and 36 are resilient, they are capable of moving their corresponding clamping electrodes 38, 40, 42, and 44 relatively toward each other for clamping and applying force to the area being welded. While the best mode for carrying out the invention has been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention as defined by the following claims .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Abstract

Apparatus for resistance butt welding end portions (22, 24) of a part includes first and second pluralities of resilient conductors (34, 36) forming secondary loops with the part. The first plurality of conductors (34) are inductively coupled to a first iron core (30) and have two clamping electrodes (38, 40) formed at free ends thereof. The second plurality of conductors (36) are inductively coupled to a second iron core (32) and also have two clamping electrodes (42, 44) at free ends thereof. When a first voltage is applied across a first primary winding (26) a welding voltage is induced at the clamping electrodes of the first plurality of conductors. When a second voltage is applied across a second primary winding (28) another welding voltage is induced at the clamping electrodes of the second plurality of conductors. A welding current is produced when the voltages are applied to the windings, the end portions are clamped, and force is applied to butt the end portions together.

Description

APPARATUS FOR HOLDING AND
RESISTANCE BUTT WELDING PORTIONS
OF AT LEAST ONE PART TOGETHER
Technical Field
This invention relates to apparatus for welding and, more particularly, to apparatus for holding and resistance butt welding portions of at least one part together.
Background Art
Welding processes typically require the application of heat or pressure, or both, to produce a bond between end portions of part(s) being joined. Welding usually involves application or development of localized heat near the intended joint.
Welding processes that use resistance welding are among the most widely used in industry. Resistance welding is a method of fusing metal parts together by heating them with large currents and applying pressure to form a fused metal joint between them. The power and energy density of the heat source must be sufficient to accomplish local melting.
To resistance butt weld steel wheel rims, a flat strip of steel is bent into a hoop, as illustrated at 10 in Figure 1, and the end portions of the bent steel strip 10 are held between pairs of electrodes/clamps 12. The clamps 12 are generally capable of moving relative to one another to not only clamp the end portions of the bent steel strip 10 but also to urge the end portions of the steel strip 10 together as a large electrical current flows between the two end portions, thereby heating the two end portions. When softened by heating, the two end portions to be welded together fuse to form a weld joint upon the application of suitable pressure as is well known in the art.
The apparatus of Figure 1 typically includes a welding control 14 which receives input power along a three-phase power line labeled LI, L2 and L3. The welding control 14, in turn, supplies inputs HI, H2 and H3 to a three-phase DC power supply 16 generally of the type disclosed in the U.S. patent to Farrow 4,513,363. The power supply 16 typically includes a number of semiconductor diodes to supply DC power at outputs which are coupled to copper bus bars 18. Typically, these bus bars are approximately 12 inches wide and 2 inches thick. At the end of each of the bus bars 18, there is coupled a flexible conductor 20 on a free end of which there is secured one of the clamping electrodes 12.
The apparatus of Figure 1 has proven to be useful over the years in welding the end portions of steel to form steel wheels. However, as more and more manufacturers desire to make aluminum wheels, the apparatus of Figure 1 has proven to be less useful . For example, for aluminum wheels, the current required is approximately 250,000 amperes. In order to get the proper welding current to flow at the clamping electrodes 12, the voltage required at the power supply 16 is about 12-15 volts. Consequently, it can be seen that the apparatus of Figure 1 requires the power supply 16 to handle a large amount of power . At these large power levels, semiconductor diodes in the power supply 10 are susceptible to damage due to thermal cycling.
The U.S. patent to Farrow 4,831,229 discloses a resistance spot welding structure comprising two transformer structures, each containing primary and secondary circuits and electrodes integrally connected to the secondary circuits.
Summary Of The Invention
An object of the present invention is to provide an apparatus for holding and resistance butt welding portions of at least one part together wherein the power required for such resistance butt welding is substantially reduced from the apparatus of the prior art .
Another object of the present invention is to provide an apparatus for holding and resistance butt welding portions of at least one part together wherein relatively expensive and complicated parts of the prior art apparatus can be eliminated such as bus bars and the three-phase power supply including the semiconductors therein.
Yet, still another object of the present invention is to provide an apparatus for holding and resistance butt welding portions of at least one part together wherein welding can be accomplished at greatly reduced voltages and wherein the clamping electrodes and the part or parts themselves to be welded form part of secondary loops of the apparatus . In carrying out the above objects and other objects of the present invention, an apparatus is provided for holding and resistance butt welding a first end portion to a second end portion of at least one part together. The apparatus includes first and second primary windings, first and second cores inductively coupled to the first and second primary windings, respectively, and a first plurality of resilient conductors inductively coupled to the first core. The first plurality of resilient conductors have first and second clamping electrodes formed at free end portions thereof. The apparatus also includes a second plurality of resilient conductors inductively coupled to the second core. The second plurality of resilient conductors have first and second clamping electrodes formed at free end portions thereof. A first voltage applied across the first primary winding induces a welding voltage at the first and second clamping electrodes of the first plurality of resilient conductors. A second voltage applied across the second primary winding induces a welding voltage at the first and second clamping electrodes of the second plurality of resilient conductors. When the first and second voltages are applied, the first end portion of the at least one part is resilient- ly clamped between the first clamping electrode of the first plurality of resilient conductors and the first clamping electrode of the second plurality of resilient conductors, and the second end portion of the at least one part is resiliently clamped between the second clamping electrode of the first plurality of resilient conductors and the second clamping electrode of the second plurality of resilient conductors, a welding current is produced in the first and second end portions of the at least one part . Preferably, the first plurality of resilient conductors includes strips of metal conductors and the second plurality of resilient conductors also includes strips of metal conductors .
Also, preferably, the first core is an iron core and the second core is an iron core.
Still, preferably, the first core has first and second legs and wherein the first primary winding has a first number of turns about the first leg of the first core and wherein the first plurality of resilient conductors are formed about the second leg of the first core. Furthermore, the second core includes first and second legs and wherein the second primary winding has a second number of turns about the first leg of the second core and wherein the second plurality of resilient conductors are formed about the second leg of the second core .
Yet, still preferably, the first clamping electrode of the first plurality of resilient conductors defines a first continuous clamping surface adapted to engage a first surface of the first end portion of the at least one part; the second clamping electrode of the first plurality of resilient conductors defines a second continuous clamping surface adapted to engage a first surface of the second end portion of the at least one part; the first clamping electrode of the second plurality of resilient conductors defines a third continuous clamping surface adapted to engage a second surface of the first end portion of the at least one part; and the second clamping electrode of the second plurality of resilient conductors defines a fourth continuous clamp- ing surface adapted to engage a second surface of the second end portion of the at least one part .
The above objects and other objects, features, and advantages of the present invention are readily apparent from the following detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
Brief Description Of The Drawings
FIGURE 1 is a schematic view of a prior art apparatus for holding and resistance butt welding end portions of a part together to form a wheel;
FIGURE 2 is a schematic end view illustrating the apparatus of the present invention;
FIGURE 3 is a schematic side elevational view of the apparatus ; and
FIGURE 4 is a schematic top plan view of the apparatus .
Best Mode For Carrying Out The Invention
Referring now to Figures 2-4, there is generally indicated an apparatus for holding and resistance butt welding a first end portion 22 to a second end portion 24 of a curved metal part such as the steel part 10 of Figure 1. However, it is to be understood that the end portions 22 and 24 may be end portions of two separate parts. The apparatus for holding and resistance butt welding includes first and second primary windings 26 and 28, respectively, for receiving primary power.
The apparatus also includes first and second iron cores 30 and 32, respectively, which are inductively coupled to the first and second primary windings 26 and 28, respectively. Preferably, the iron cores 30 and 32 are in the form of closed loop links. However, it is to be understood that each of the cores 30 and 32 instead of being made of one integral member may be in the form of individual cores for each of first and second pluralities of resilient conductors, generally indicated at 34 and 36, respectively.
Preferably, both the first and second plurali- ty of resilient conductors 34 and 36, respectively, are formed from strips of metal conductors in the same way that the flexible conductors 20 of Figure 1 are formed.
The first iron core 30 has first and second legs 29 and 31. The first primary winding 26 has a first number of turns about the first leg 29 and the first plurality of resilient conductors 34 are formed about the second leg 31 of the first core 30.
In like fashion, the second iron core 32 has first and second legs 33 and 35, respectively, as shown in Figure 3. The second primary winding 28 has a second number of turns about the first leg 33 and the second plurality of resilient conductors 36 are formed about the second leg 35 by passing through the iron core 32. The first plurality of resilient conductors 34 are inductively coupled to the first core 30. Each of the first plurality of resilient conductors 34 have first and second clamping electrodes 38 and 40 formed at free end portions thereof. For example, the clamping electrodes 38 and 40 may be welded at the free end portions of the resilient conductors 34.
The second plurality of resilient conductors 36 are inductively coupled to the second core 32. The second plurality of resilient conductors 36 also have first and second clamping electrodes 42 and 44, respectively, formed at their free end portions.
A first voltage applied across the first primary winding 26 induces a welding voltage at the first and second clamping electrodes 38 and 40 of the first plurality of resilient conductors 34. A second voltage applied across the second primary winding 28 induces a welding voltage at the first and second clamping electrodes 42 and 44 of the second plurality of resilient conductors 36.
A welding current is produced within the first and second end portions 22 and 24, respectively, of at least one part when the following occurs :
1. The first and second voltages are applied to the first and second primary windings 26 and
28, respectively;
2. The first end portion 22 of the at least one part is resiliently clamped between the first clamping electrode 38 of the first plurality of resilient conductors 34 and the first clamping electrode 42 of the second plurality of resilient conductors 36;
3. The second end portion 24 of the at least one part is resiliently clamped between the second clamping electrode 40 of the first plurality of resilient conductors 34 and the second clamping electrode 44 of the second plurality of resilient conductors 36; and
4. A force is applied to close the gap between the end portions 22 and 24 of the part.
Also, preferably, the first and second clamping electrodes 38 and 40, respectively, of the resilient conductors 34 define continuous clamping surfaces 46 and 48, respectively. The clamping surface 46 engages a first surface 50 of the first end portion 22 whereas the second clamping surface 48 engages a first surface 52 of the second end portion 24.
In similar fashion, the first clamping electrode 42 of the second plurality of resilient conductors 36 defines a clamping surface 54 adapted to engage a second surface 56 of the free end portion 22.
Similarly, the second clamping electrode 44 of the second plurality of resilient conductors 36 defines a clamping surface 58 adapted to engage a second surface 60 of the second end portion 24 of the part.
Because the conductors 34 and 36 are resilient, they are capable of moving their corresponding clamping electrodes 38, 40, 42, and 44 relatively toward each other for clamping and applying force to the area being welded. While the best mode for carrying out the invention has been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention as defined by the following claims .

Claims

What Is Claimed Is:
1. Apparatus for holding and resistance butt welding a first end portion to a second end portion of at least one part together, the apparatus comprising: first and second primary windings; first and second cores inductively coupled to the first and second primary windings, respectively; a first plurality of resilient conductors inductively coupled to the first core, the first plural- ity of resilient conductors having first and second clamping electrodes formed at free end portions thereof; and a second plurality of resilient conductors, inductively coupled to the second core, the second plurality of resilient conductors having first and second clamping electrodes formed at free end portions thereof; wherein a first voltage applied across the first primary winding induces a welding voltage at the first and second clamping electrodes of the first plurality of resilient conductors, wherein a second voltage applied across the second primary winding induces a welding voltage at the first and second clamping electrodes of the second plurality of resilient conductors; and wherein when the first and second voltages are applied and when the first end portion of the at least one part is resiliently clamped between the first clamping electrode of the first plurality of resilient conductors and the first clamping electrode of the second plurality of resilient conductors and when the second end portion of the at least one part is resiliently clamped between the second clamping electrode of the first plurality of resilient conductors and the second clamping electrode of the second plurality of resilient conductors, a welding current is produced in the first and second end portions of the at least one part .
2. The apparatus as claimed in claim 1 wherein the first plurality of resilient conductors includes strips of metal conductors.
3. The apparatus as claimed in claim 2 wherein the second plurality of resilient conductors includes strips of metal conductors.
4. The apparatus as claimed in claim 1 wherein the first core is an iron core.
5. The apparatus as claimed in claim 4 wherein the second core is an iron core.
6. The apparatus as claimed in claim 1 wherein the first core has first and second legs and wherein the first primary winding has a first number of turns about the first leg of the first core and wherein the first plurality of resilient conductors are formed about the second leg of the first core.
7. The apparatus as claimed in claim 6 wherein the second core includes first and second legs and wherein the second primary winding has a second number of turns about the first leg of the second core and wherein the second plurality of resilient conductors are formed about the second leg of the second core.
8. The apparatus as claimed in claim 1 wherein the first clamping electrode of the first plurality of resilient conductors defines a first continuous clamping surface adapted to engage a first surface of the first end portion of the at least one part .
9. The apparatus as claimed in claim 8 wherein the second clamping electrode of the first plurality of resilient conductors defines a second continuous clamping surface adapted to engage a first surface of the second end portion of the at least one part.
10. The apparatus as claimed in claim 9 wherein the first clamping electrode of the second plurality of resilient conductors defines a third continuous clamping surface adapted to engage a second surface of the first end portion of the at least one part.
11. The apparatus as claimed in claim 10 wherein the second clamping electrode of the second plurality of resilient conductors defines a fourth continuous clamping surface adapted to engage a second surface of the second end portion of the at least one part .
PCT/US1997/016882 1996-10-25 1997-09-23 Apparatus for holding and resistance butt welding portions of at least one part together WO1998018592A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73809796A 1996-10-25 1996-10-25
US08/738,097 1996-10-25

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Publication Number Publication Date
WO1998018592A1 true WO1998018592A1 (en) 1998-05-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1303964A (en) * 1919-05-20 Electric-welding transformer
US2392101A (en) * 1943-07-10 1946-01-01 Taylor Winfield Corp Control of welding current
US4021634A (en) * 1975-04-02 1977-05-03 Firma Evg Entwicklungs-U Verwertungsgesellschaft Mesh welding machine
US4831229A (en) * 1986-12-08 1989-05-16 Medar, Inc. High frequency resistance spot welding structure and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1303964A (en) * 1919-05-20 Electric-welding transformer
US2392101A (en) * 1943-07-10 1946-01-01 Taylor Winfield Corp Control of welding current
US4021634A (en) * 1975-04-02 1977-05-03 Firma Evg Entwicklungs-U Verwertungsgesellschaft Mesh welding machine
US4831229A (en) * 1986-12-08 1989-05-16 Medar, Inc. High frequency resistance spot welding structure and method

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