Control circuit and method for stud welding gun lifting solenoid

Details Control circuit and method for stud welding gun lifting solenoid Control circuit and method for stud welding gun lifting solenoid

1984-09-17

1986-10-14

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 99, 361194, B23K 920

Patent

active

046174451

ABSTRACT:
A solenoid power control circuit provides full power during lifting and reduced power during maintaining a lift condition in a lifting solenoid of an electric arc stud welding gun. During the stud lifting portion of a stud welding process, relatively high power is provided to the lifting solenoid to effect work necessary to accomplish the lift; but after a lifted condition has been achieved, the invention phases back power to reduce the energy dissipated while the stud and the lifting solenoid are maintained in lifted condition. A relaxation oscillator having two different charging time constants that can be selected to provide long or short phase delay is employed for the phase modulation control of lifting solenoid energization.

REFERENCES:
patent: 2257361 (1941-09-01), Yorkey
patent: 3414700 (1968-12-01), Glorioso
patent: 3737736 (1973-06-01), Stampfli

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