Electric heating – Metal heating – For bonding with pressure
Patent
1985-11-19
1987-01-06
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219110, B23K 1124
Patent
active
046348301
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.
REFERENCES:
patent: 4465918 (1984-08-01), Kiriyama et al.
patent: 4493040 (1985-01-01), Vanderhelst
Dengensha Manufacturing Company Limited
Shaw Clifford C.
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