PULSE ARC WELDING METHOD AND PULSE ARC WELDING EQUIPMENT USING THIS METHOD

摘要

PURPOSE:To obviate time lag of control in a control system and an unstable element of the control system by controlling a base current application period so that the welding average voltage is coincident with a welding average voltage reference value while controlling a peak current application period to a preset specified value. CONSTITUTION:When a peak current application signal is outputted from a peak period control means 2 according to a base current application completion signal outputted from a base period control means 1, a welding voltage error integration circuit 10 compares the detected welding voltage with a reference value set by a welding voltage setting part 3 and starts integration of a differential signal. when one peak current application signal from the peak period control means 2 is stopped and a base current application signal is outputted, the integration circuit 10 compares the detected welding voltage with the welding average voltage reference value set by the welding voltage setting part 3 and the differential signal is integrated. A zero-cross detection circuit (voltage integration level discrimination part) 11 monitors an output level of the integration circuit 10 and outputs the base current application completion signal to the peak period control means 2 when the differential signal extending from the peak current application starting time to the base current application time attains a zero level.