METHOD FOR CONTROLLING ARCH LENGTH IN PULSE ARC WELDING

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling arc length in which the arc length is constantly retained to an appropriate value by exactly detecting the arc length even if unusual voltage occurs.;SOLUTION: Welding voltage Vw is detected. The detection value of the welding voltage is limited within a predetermined variation range Vc±ΔVc using a reference voltage waveform previously determined as input as a center voltage value Vc to calculate a welding voltage limiting value Vft. The average value of the welding voltage is calculated by using the welding voltage limiting value Vft as input. The arc length is controlled by the average value of the welding voltage obtained from the welding voltage limiting value Vft.;COPYRIGHT: (C)2004,JPO