Electric heating – Metal heating – For bonding with pressure
Patent
1993-09-17
1995-02-14
Evans, Geoffrey S.
Electric heating
Metal heating
For bonding with pressure
29 8106, 29 8107, 29 8109, 134 5, 134 37, 2191171, 21912163, 228 201, 228205, B23K 1134, B23K 1108, B23K 2600
Patent
active
053897617
ABSTRACT:
An apparatus comprises a current source, first and second wheels through which a current from the current source selectively flows, and a source of gas, wherein the first and second wheels receive first and second pieces of metal having overlapping portions, force the first and second pieces of metal together at said overlapping portions. The current from the current source flows through the first and second wheels in the overlapping portions of the first and second pieces of metal, generating heat in said first and second pieces of metal sufficient to melt a coating on the first and second sheets of metal where the first and second sheets of metal contact and overlap. The source of gas comprises removes said melted coatings away from the overlapping portions of metal to clean the metal surfaces in preparation for movement to a weld station where the pieces of metal are resistive seam welded or laser lap seam welded. Preferably the source of gas supplies an inert gas to prevent reoxidation of the pieces between the apparatus and the weld station.
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Evans Geoffrey S.
General Motors Corporation
Simon Anthony L.
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