Electric heating – Metal heating – For bonding with pressure
Patent
1994-10-12
1996-06-04
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
055235417
ABSTRACT:
A control apparatus controls a welding current of a resistance welding machine by controlling a thyristor firing angle. A memory stores data of a predetermined relationship between thyristor firing angle and welding current for a parameter of power factor. A microprocessor reads the measurements of a welding current and power factor angle of a previous welding operation having a welding condition similar to that of a present welding operation. The microprocessor determines the initial thyristor firing angle from the measurements of the previous welding operation and a set welding current of a present welding operation. The initial thyristor firing angle is used to control a welding current of a first cycle of the present welding operation. The arrangement provides an ideal constant-current control, yielding a satisfactory weldment.
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patent: 4634830 (1987-01-01), Furudate
patent: 4885451 (1989-12-01), Farrow et al.
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Miyachi Technos Corporation
Shaw Clifford C.
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