Controlled pressure butt welding process and apparatus for carrying it out
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United States of America Patent
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Sep 25, 1990
Issued Date -
N/A
app pub date -
Feb 23, 1989
filing date -
Feb 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a pressure butt welding process, in particular for welding chain link bent from round wire, the influence of disturbing factors on the quality of the welding result is compensated by measuring the welding forces F.sub.K exerted on the workpiece by the upsetting dies and setting and welding voltage applied to the workpiece according to the level of the measured forces F.sub.K. A control means adjusts the welding voltage via a thyristor control circuit and thereby the effective welding power in such a way that the welding forces F.sub.K remain constant.
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