Power control manner null of power source for consumable electrode type arc welding

摘要

PURPOSE:To control the welding current and voltage based on optimum reference waveforms by correcting the reference waveforms by an arithmetic means so that a variance state of the waveforms of the welding current and voltage controlled after an arc is started is regulated in the prescribed range. CONSTITUTION:After the arc is started, the welding current and the welding voltage are controlled according to the reference waveforms generated by a waveform generation part 16 by a feedback control system of a voltage detection part 11, a current detection part 12 and the waveform generation part 16 and the variance state is calculated by a CPU of a microcomputer 15 from subsequent variance of the detected waveforms of the welding current and welding voltage based on the outputs of the current detection part 12 and the voltage detection part 11 and it is detected by the CPU whether or not the variance is within the prescribed range. If the calculated variance state exceeds the prescribed range, the short-circuit time and the arc time, for instance among various parameters to correct the reference waveforms are controlled to correct both reference waveforms of the waveform generation part 16 to the optimum waveforms and the variance state of the waveforms of the welding current and voltage is suppressed within the prescribed range and the stable arc is maintained.