DC resistance welding apparatus

Details DC resistance welding apparatus DC resistance welding apparatus

1992-03-12

1993-03-23

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

051966689

ABSTRACT:
A DC resistance welding apparatus includes a pair of welding electrodes for sandwiching workpieces to be welded therebetween and a circuit connected to the welding electrodes for supplying a welding current to said welding electrodes. The circuit includes a plurality of parallel-connected rectifying circuits each having a welding transformer and rectifying circuit. The circuit monitors the power signal produced by inverters in the power supply to determine the proper energization time by producing a pulse signal corresponding to the waveform of the power signal. The rise and fall of the pulse signal is then detected and differentiated. The differential signal is used as a basis to control the energization time of the welding gun.

REFERENCES:
patent: 3571552 (1971-03-01), Opal
patent: 3840720 (1974-10-01), Wolf
patent: 4388515 (1983-06-01), Mathews
patent: 4503316 (1985-03-01), Murase et al.
patent: 4564742 (1986-01-01), Karlsson
patent: 4792656 (1988-12-01), Namiki et al.
patent: 4910375 (1990-03-01), Izume

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