Method of controlling constant-current for resistance welding machines
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United States of America Patent
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-
Jan 6, 1987
Grant Date -
N/A
app pub date -
Nov 19, 1985
filing date -
Nov 19, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of controlling constant-current for resistance welding machines comprising the steps of: detecting the welding current flowing into the primary coil or the secondary coil of a welding transformer, applying a first half-wave current having a predetermined first phase control angle, detecting the current value and the current conduction angle at that time, calculating a power factor angle of the resistance welding machine from the detected conduction angle and the phase control angle, calculating a second phase control angle, by which a current value corresponding to a previously set value of the next half-wave of current is obtained, from the calculated power factor angle, the detected conduction angle and the detected of current value, applying the next half-wave current at the second phase control angle through a thyristor circuit to a work to be welded, and repeating the above control operation during an entire welding cycle.
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