Current unit for arc welding
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
Mar 27, 1984
Grant Date -
N/A
app pub date -
Sep 19, 1980
filing date -
May 12, 1976
priority date (Note) -
In Force
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 controlling the operating frequency of the converter in a manner such that it is substantially inversely proportional to the square of the input voltage of the current supply unit, thereby maintaining the power output of said unit substantially unchanged irrespective of changes in load caused by the welding operation and irrespective of variations in said input voltage.
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