Spot welding control method and apparatus using a servo welding gun
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
Aug 22, 1994
filing date -
Aug 25, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A spot welding method and apparatus having electrode tips one of which is driven by a servo motor. In the method and apparatus, it is determined whether or not an abnormal condition occurs. The abnormal condition includes (a) squeezing some obstacle between the electrode tip and a workpiece, (b) a temperature adhesion of the electrode tips with the workpiece, (c) uneven pressurizing of the workpiece by the electrode tips, (d) a weld nugget dispersion, and (e) a too large electric resistance between the electrode tips and the workpiece. When such abnormal condition is detected, some counter measure is taken to prevent or decrease the abnormal condition.
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