US3778583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance welding of sheet metal coated with layers
Assignee: Individual
•
Filing: 1970-12-30
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Granted: 1973-12-11
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Expires: 1990-12-30
Abstract
Abstract The invention relates to a method for the resistance welding of sheet metal coated with layers, wherein firstly electrical contact is established between the sheets to be interwelded and between the welding electrodes and said sheets, and subsequently welding is effected across the coating layers. The invention relates also to machines for carrying out this method.
Inventors
- 👤 O Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:14
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/16; B23K11/163
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
178 words
A method for resistance welding of insulation-coated sheet metal to at least one other coated sheet metal, said method comprising arranging on the superposed sheet metals a pair of juxtapositioned main electrodes and, side by side thereto at least one pair of juxtapositioned auxiliary electrodes, each of said auxiliary electrodes being electrically insulated from each main electrode arranged at the same side of the sheet metals to be welded, and being connected to the main electrode arranged at the other side of the sheet metals by shunt lines, passing current from the main electrode on one side of the sheet metals to be welded through the metal sheet in contact with said main electrode to the auxiliary electrodes on the same side of the sheet metals, so as to heat said metal sheet and to melt the coating layers on subsequent welding, establishing contact through the shunts from said auxiliary electrodes to the main electrode on the opposed side of the metal sheets, and subsequently welding the sheet metals simultaneously through the juxtapositioned main electrodes and auxiliary electrodes.
Claim 2
Independent Claim
178 words
A method for resistance welding of insulation-coated sheet metal to at least one other coated sheet metal, said method comprising arranging on the superposed sheet metals a pair of juxtapositioned main electrodes and, side by side thereto at least one pair of juxtapositioned auxiliary electrodes, each of said auxiliary electrodes being electrically insulated from each main electrode arranged at the same side of the sheet metals to be welded, and being connected to the main electrode arranged at the other side of the sheet metals by shunt lines, passing current from the main electrode on one side of the sheet metals to be welded through the metal sheet in contact with said main electrode to the auxiliary electrodes on the same side of the sheet metals, so as to heat said metal sheet and to melt the coating layers on subsequent welding, establishing contact through the shunts from said auxiliary electrodes to the main electrode on the opposed side of the metal sheets, and subsequently welding the sheet metals simultaneously through the juxtapositioned main electrodes and auxiliary electrodes.
Claim 3
Dependent Claim
54 words
The method of claim 1, in which the pairs of juxtapositioned auxiliary electrodes are constructed as welding tongs and in which shunts are provided leading from the upper main electrode to the lower auxiliary electrodes of the welding tongs and from the lower main electrode to the upper auxiliary electrodes of the welding tongs.
Claim 4
Independent Claim
211 words
A method for resistance welding of insulation-coated sheet metal to at least one other sheet metal comprising arranging on top of the sheet metals to be welded a first welding appliance with a spatially parallel positioned first main electrode and a first auxiliary electrode electrically insulated from said main electrode and beneath the sheet metals to be welded a second welding appliance with a spatially parallel positioned second main electrode and a second auxiliary electrode insulated from said second main electrode, the main electrodes and the auxiliary electrodes being in juxtaposition to each other, providing the outermost sheet metals on its coating layers with stripped zones on the spots to be welded, connecting the first auxiliary electrode of the first welding appliance by a shunt with the second auxiliary electrode of the second welding appliance, passing current from the first main electrode through the upper sheet metal to the spatially parallel positioned first auxiliary electrode and from there through the shunt to the second auxiliary electrode of the second welding appliance through the lower sheet metal to the spatially parallel positioned second main electrode to cause heating of the metal sheets and melting of the coating layers, and subsequently welding the sheet metals simultaneously through the juxtapositioned main and auxiliary electrodes.
Claim 5
Independent Claim
211 words
A method for resistance welding of insulation-coated sheet metal to at least one other sheet metal comprising arranging on top of the sheet metals to be welded a first welding appliance with a spatially parallel positioned first main electrode and a first auxiliary electrode electrically insulated from said main electrode and beneath the sheet metals to be welded a second welding appliance with a spatially parallel positioned second main electrode and a second auxiliary electrode insulated from said second main electrode, the main electrodes and the auxiliary electrodes being in juxtaposition to each other, providing the outermost sheet metals on its coating layers with stripped zones on the spots to be welded, connecting the first auxiliary electrode of the first welding appliance by a shunt with the second auxiliary electrode of the second welding appliance, passing current from the first main electrode through the upper sheet metal to the spatially parallel positioned first auxiliary electrode and from there through the shunt to the second auxiliary electrode of the second welding appliance through the lower sheet metal to the spatially parallel positioned second main electrode to cause heating of the metal sheets and melting of the coating layers, and subsequently welding the sheet metals simultaneously through the juxtapositioned main and auxiliary electrodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |