B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/67
B23K 9/06 (2006.01) B23K 9/10 (2006.01)
Patent
CA 1049104
ABSTRACT OF THE DISCLOSURE A D.C. arc welding power circuit with solid state components which is provided with a converting bridge for converting A.C to D.C. and with controlled diodes serially connected in the D.C. line between the converting bridge and a transformer providing electric isolation between the D.C. line and the terminals of a welding head. A further controlled diode is also connected to the D.C. line down- stream of the control diodes and in parallel with the transformer and in series with a capacitor. Between the transformer and the welding head a rectifying assembly is arranged. The serially connected controlled diodes are simultaneously triggered by a pulse amplifier and transformer. A further pulse amplifier and a further pulse transformer subsequently trigger the further controlled diode, whereby the serially connected controlled diodes are turned off. The pulse amplifiers and transformers are alternately driven by a square wave generating assembly whose period depends on a magnitude proportional to the voltage and current levels at the terminals of the welding head.
238316
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