Arc welding current supply
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United States of America Patent
Stats
-
May 3, 1983
Issued Date -
N/A
app pub date -
Sep 19, 1980
filing date -
May 12, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An a.c. operated arc welding current supply unit comprises a frequency converter of the series capacitor type and operating with a half period which is substantially less than the average duration of the current and voltage transients caused by short circuits through droplets of weld material during welding. The frequency converter is connected to welding electrodes through a transformer in series with a rectifier to provide direct current for the welding electrodes, and the frequency converter is associated with a control device for maintaining the operating frequency of the converter constant, thereby maintaining the arc power substantially unchanged irrespective of changes in load caused by the welding operation.
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