CA1073535A - Electrode for resistance welding of workpiece provided with electro-insulating coatings - Google Patents
Electrode for resistance welding of workpiece provided with electro-insulating coatingsInfo
- Publication number
- CA1073535A CA1073535A CA282,339A CA282339A CA1073535A CA 1073535 A CA1073535 A CA 1073535A CA 282339 A CA282339 A CA 282339A CA 1073535 A CA1073535 A CA 1073535A
- Authority
- CA
- Canada
- Prior art keywords
- electrode
- shank
- tip
- electro
- parts
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
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
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/163—Welding of coated materials
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The electrode according to the invention is applicable to resistance spot welding of workpieces having electro-insulating coatings, especially of metal sheets and strips coated with organic plastics. The working element of the electrode is formed as an exchangeable tip made of layers of materials having various resistivities. The tip remains in exclusively frontal electric contact with a shank built of two parts separated longitu-dinally by an insulating plate. The tip is fitted to the shank by means of an insulating clamping ring. Cooling of the electrode is realized by means of independent cooling ducts having inlets and outlets arranged on the side surfaces of the shank.
The electrode according to the invention is applicable to resistance spot welding of workpieces having electro-insulating coatings, especially of metal sheets and strips coated with organic plastics. The working element of the electrode is formed as an exchangeable tip made of layers of materials having various resistivities. The tip remains in exclusively frontal electric contact with a shank built of two parts separated longitu-dinally by an insulating plate. The tip is fitted to the shank by means of an insulating clamping ring. Cooling of the electrode is realized by means of independent cooling ducts having inlets and outlets arranged on the side surfaces of the shank.
Description
This invention relates to an electrode for resistance welding of workpieces provided with electro-insulating coatings, especially with organic coatings.
There are known electrodes heated directly with the electric cur-rent passing therethrough, provided wi~h suitably formed uniform tips made of materia1S resistant to work at elevated temperatures, and showing an approp-riate resistivity. The heat emitted from the electrodes and the pressure force thereof remove locally the insulating coatings and secure the electric contact determining the possibility of the resistance welding.
From Japanese Patent Specifications NosO 45-15856 and 49-3380 there are known methods of resistance welding of workpieces provided with insulating coatings, wherein the electrode performs a dual work. In the ~irst phase of its working cycle the electrode prepares the surfaces of the workpieces to be welded, causing the necessary electric contact to be created in a thermo~mechanical process of removing the insulating coating from the area of the ~oint, and in the second phase it performs the purpose of a weld-ing electrode.
According to the broadest aspect of the invention there is provid-ed an electrode for resistance welding of workpieces provided with electro-insulating coatings, said electrode being equipped with a shank built of two parts insulated from each other, characterized by a working element comprising an exchangeable laminar tip made of materials having various resistivities, said tip remaining in exclusively frontal electric contact with the shank, ~hl`ch shank is adapted to be cooled.
In the tip the layer remaining in contact with the shank is made o~ a matesial having a low resistivity. The middle layer constituting the heating element is made of a material having high resistivity. The layer contacting directly with the workpiece to be welded has its resistivity determined by the grade of the material to be welded.
Both parts of the shank are preferably provided with independent - 1 - ~
~073535 cooling ducts, the inlets and outlets thereof being arranged on side surfaces of the shank parts.
The invention will be now described by means of an exemplary embodiment with reference to the accompanying drawing showing a longitudinal sectional view of the electrode according to the invention.
As shown in the drawing, the electrode shank is composed of a left-hand part 1 and a right-hand part 2, these being separated by the insulating plate 3. The members are secured against shifting in relation to each other, and connected together by means of external rings 4 and 5 and/
or screws 6 and 7. In both cases the connections are performed in a way securing the insulating of both shank parts 1 and 3 from each other.
The working part of the electrode according to the invention is formed by the exchangeable tip 8 connected with the shank by means of the insulating clamping ring 9 fitted on the shank in a way securing complete insulation of the grip portion of the tip 8 from the electrode shank. The tip 8 is of a laminar structure, Its upper layer a contacting with the electrode shank is made of a material having low resistivity. The middle layer b constituting the heating element is made of a material having high resistivity. The lower layer c being actually the working tip of the entire electrode, is made of a material the resistivity of which is determined by the type and grade of material to be welded.
Cooling of the parts 1 and 2 of the electrode shank is mutually independent and is realized through cooling ducts 10 and 11 arranged in the lower part of the shank. The ducts are closed from the bottom by means of a split plate 12, and the inlets and outlets thereof are situated on the side surfaces of the shank. Moreover, on the side surface of one of the parts 1 or 2 of the shank the clamp 13 is fitted, making it possible to connect a wire coupling together, if need be, two co-operating electrodes.
`~ The working contact of the specified tip 8 with the electrode shank is realized by the force pressing the electrode to the workpieces being welded. The exchange of the tip 8 follows on removing one of the parts of the split clamping ring 9. The tip 8 is secured from probable turning around the electrode axis by means of a set key 14 mounted in an elongated recess made in the grip part of the tip 8.
There are known electrodes heated directly with the electric cur-rent passing therethrough, provided wi~h suitably formed uniform tips made of materia1S resistant to work at elevated temperatures, and showing an approp-riate resistivity. The heat emitted from the electrodes and the pressure force thereof remove locally the insulating coatings and secure the electric contact determining the possibility of the resistance welding.
From Japanese Patent Specifications NosO 45-15856 and 49-3380 there are known methods of resistance welding of workpieces provided with insulating coatings, wherein the electrode performs a dual work. In the ~irst phase of its working cycle the electrode prepares the surfaces of the workpieces to be welded, causing the necessary electric contact to be created in a thermo~mechanical process of removing the insulating coating from the area of the ~oint, and in the second phase it performs the purpose of a weld-ing electrode.
According to the broadest aspect of the invention there is provid-ed an electrode for resistance welding of workpieces provided with electro-insulating coatings, said electrode being equipped with a shank built of two parts insulated from each other, characterized by a working element comprising an exchangeable laminar tip made of materials having various resistivities, said tip remaining in exclusively frontal electric contact with the shank, ~hl`ch shank is adapted to be cooled.
In the tip the layer remaining in contact with the shank is made o~ a matesial having a low resistivity. The middle layer constituting the heating element is made of a material having high resistivity. The layer contacting directly with the workpiece to be welded has its resistivity determined by the grade of the material to be welded.
Both parts of the shank are preferably provided with independent - 1 - ~
~073535 cooling ducts, the inlets and outlets thereof being arranged on side surfaces of the shank parts.
The invention will be now described by means of an exemplary embodiment with reference to the accompanying drawing showing a longitudinal sectional view of the electrode according to the invention.
As shown in the drawing, the electrode shank is composed of a left-hand part 1 and a right-hand part 2, these being separated by the insulating plate 3. The members are secured against shifting in relation to each other, and connected together by means of external rings 4 and 5 and/
or screws 6 and 7. In both cases the connections are performed in a way securing the insulating of both shank parts 1 and 3 from each other.
The working part of the electrode according to the invention is formed by the exchangeable tip 8 connected with the shank by means of the insulating clamping ring 9 fitted on the shank in a way securing complete insulation of the grip portion of the tip 8 from the electrode shank. The tip 8 is of a laminar structure, Its upper layer a contacting with the electrode shank is made of a material having low resistivity. The middle layer b constituting the heating element is made of a material having high resistivity. The lower layer c being actually the working tip of the entire electrode, is made of a material the resistivity of which is determined by the type and grade of material to be welded.
Cooling of the parts 1 and 2 of the electrode shank is mutually independent and is realized through cooling ducts 10 and 11 arranged in the lower part of the shank. The ducts are closed from the bottom by means of a split plate 12, and the inlets and outlets thereof are situated on the side surfaces of the shank. Moreover, on the side surface of one of the parts 1 or 2 of the shank the clamp 13 is fitted, making it possible to connect a wire coupling together, if need be, two co-operating electrodes.
`~ The working contact of the specified tip 8 with the electrode shank is realized by the force pressing the electrode to the workpieces being welded. The exchange of the tip 8 follows on removing one of the parts of the split clamping ring 9. The tip 8 is secured from probable turning around the electrode axis by means of a set key 14 mounted in an elongated recess made in the grip part of the tip 8.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Electrode for resistance welding of workpieces provided with electro-insulating coatings, said electrode being equipped with a shank built of two parts insulated from each other, characterized by a working element comprising an exchangeable laminar tip made of materials having various resistivities, said tip remaining in exclusively frontal electric contact with the shank, which shank is adapted to be cooled.
2. Electrode as defined in Claim 1, characterized in that a first layer of the tip contacting the electrode shank is made of a material having low resistivity, a middle layer constituting a heating element is made of a material having high resistivity, and a third layer contacting directly with the workpiece being welded has a resistivity determined by the type and grade of material to be welded.
3. Electrode as defined in Claim 1 or 2, characterized in that both parts of the shank are provided with independent cooling ducts having inlets and outlets arranged on side surfaces of the shank parts.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL1976191448A PL105637B1 (en) | 1976-07-27 | 1976-07-27 | ELECTRODE FOR RESISTANCE WELDING OF ELEMENTS WITH ELECTROINSULATING COATINGS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073535A true CA1073535A (en) | 1980-03-11 |
Family
ID=19977968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA282,339A Expired CA1073535A (en) | 1976-07-27 | 1977-07-08 | Electrode for resistance welding of workpiece provided with electro-insulating coatings |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5315239A (en) |
| BE (1) | BE857163A (en) |
| CA (1) | CA1073535A (en) |
| DD (1) | DD130722A5 (en) |
| DE (1) | DE2733256A1 (en) |
| FR (1) | FR2359677A1 (en) |
| GB (1) | GB1548802A (en) |
| IT (1) | IT1082230B (en) |
| PL (1) | PL105637B1 (en) |
| SE (1) | SE7708568L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3018399A1 (en) * | 1980-05-14 | 1981-11-19 | Rossell Electronique S.A., Lausanne | ELECTRO WELDING ELECTRODE, USE OF THE ELECTRODE AND METHOD FOR THEIR OPERATION |
| JPS6068180A (en) * | 1983-09-26 | 1985-04-18 | Mitsui Petrochem Ind Ltd | Welding method of metallic material having insulating layer |
| ES2130903B1 (en) * | 1996-01-26 | 2000-03-01 | Gilboa S L | LONG-LASTING COMPACT ELECTRODE TIP FOR THERMOFUSION WELDING. |
| DE102015100496A1 (en) | 2015-01-14 | 2016-07-14 | Thyssenkrupp Ag | Welding electrode, method and apparatus for welding sandwich panels |
| DE102017203948A1 (en) | 2017-03-09 | 2018-09-13 | Thyssenkrupp Ag | Welding electrode, method for resistance spot welding a sandwich sheet and apparatus therefor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5213776B2 (en) * | 1973-08-03 | 1977-04-16 |
-
1976
- 1976-07-27 PL PL1976191448A patent/PL105637B1/en unknown
-
1977
- 1977-07-01 GB GB27542/77A patent/GB1548802A/en not_active Expired
- 1977-07-08 CA CA282,339A patent/CA1073535A/en not_active Expired
- 1977-07-22 DE DE19772733256 patent/DE2733256A1/en not_active Withdrawn
- 1977-07-25 DD DD7700200265A patent/DD130722A5/en unknown
- 1977-07-26 IT IT26132/77A patent/IT1082230B/en active
- 1977-07-26 SE SE7708568A patent/SE7708568L/en unknown
- 1977-07-26 FR FR7722929A patent/FR2359677A1/en active Granted
- 1977-07-26 JP JP8969977A patent/JPS5315239A/en active Pending
- 1977-07-26 BE BE179645A patent/BE857163A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2359677A1 (en) | 1978-02-24 |
| IT1082230B (en) | 1985-05-21 |
| DE2733256A1 (en) | 1978-02-02 |
| FR2359677B3 (en) | 1980-07-11 |
| PL105637B1 (en) | 1979-10-31 |
| DD130722A5 (en) | 1978-04-26 |
| JPS5315239A (en) | 1978-02-10 |
| PL191448A1 (en) | 1978-01-30 |
| SE7708568L (en) | 1978-01-28 |
| BE857163A (en) | 1977-11-14 |
| GB1548802A (en) | 1979-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |