B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/70
B23K 9/10 (2006.01) B23K 9/067 (2006.01) B23K 9/073 (2006.01) B23K 11/24 (2006.01)
Patent
CA 1150781
12,092 CONSTANT CURRENT WELDING POWER SUPPLY WITH AN UPSLOPE STARTING CURRENT ABSTRACT A constant current welding power supply having a single transformer with a primary winding connected to a three phase input source of line voltage and two secondary windings each having a bridge rectifier for providing an open circuit starting voltage separate from the arc working voltage. Each bridge rectifier is fired by separate firing means controlled by a logic control means. One bridge rectifier is energized with an advancing firing angle proportional to a ramp output signal enabled through the control means in response to a predetermined drop in output voltage. The other bridge rectifier is energized in synchronism with the line voltage for a predetermined period of time following the predetermined drop in output voltage.
355696
Fernicola Robert C.
Hardwick Steven F.
Hopley William G.
Union Carbide Corporation
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