Spike welding system having improved power supply

Details Spike welding system having improved power supply Spike welding system having improved power supply

1984-11-19

1985-12-24

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219111, 219114, B23K 1124

Patent

active

045608520

ABSTRACT:
A power supply for a pulse type electrical resistance welder includes an A.C. source of electrical power, a firing circuit for delivering spikes of current to a pair of welding electrodes and a precharging circuit for precharging the firing circuit with a quantity of electrical energy sufficient to produce satisfactory welds in the first cycle or first few cycles of power. The precharging circuit is controlled by control circuit which includes a thumb wheel switch for presetting the voltage to which the firing circuit is to be precharged. A relay circuit automatically disconnects the precharging circuit from the firing circuit before the latter discharges its energy to the welding electrodes. A safety circuit is provided for automatically discharging the firing circuit in the event of a power failure.

REFERENCES:
patent: 2306230 (1942-12-01), Somerville
patent: 2459153 (1949-01-01), England
patent: 3074009 (1963-01-01), Dunnabeck et al.
patent: 3143698 (1964-08-01), Rockafellow
patent: 3436514 (1969-04-01), Broomhall et al.

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