POWER SUPPLY DEVICE FOR ARC WELDING

摘要

PURPOSE:To realize a uniform weld bead by providing circuits which output time count values with the arc generation stage and the short circuit stage respectively as a start point and controlling a welding current value by the peak current set signal of each circuit. CONSTITUTION:A short circuit detecting circuit 15 outputs the signal to the 1st and 2nd timer circuits 16, 17 and a peak current setting circuit 14 when the wire short circuit transfers to arc generation. The circuit 14 outputs the peak current set value to an output control circuit 13 at the input value of the 1st timer circuit 16 from the arc generation stage and the peak current set value to the control circuit 13 at the input value of the 2nd timer circuit 17 from the point of the timer when the arc generation transfers to the wire short circuit. The output control circuit 13 compares the signal from the circuit 14 and the signal from a welding current detecting circuit 12 and outputs a command signal to a welding output control element 4 so as to stop the welding output when the welding current is larger and to supply the welding output when the welding current value is smaller.