Method of electrically welding a part such as a screw or a bolt onto a bore in a composite metal sheet
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United States of America Patent
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-
Sep 25, 2001
Issued Date -
N/A
app pub date -
Jul 19, 2000
filing date -
Jul 20, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of electrically welding a part such as a bolt around a bore of a composite sheet comprising an intermediate layer of a substantially insulating material disposed between two metal layers. Said sheet is pre-heated in the vicinity of said bore in order to remove said substantially insulating material therefrom, after which said part is welded onto said sheet by a conventional resistance spot welding method. Preferably, said pre-heating operation is conducted by passing an electric current between a counter-electrode applied to the sheet from the same side as said part to be welded, in the vicinity of said bore, and an electrode applied on said part to be welded.
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