METHOD FOR CONTROLLING CURRENT WAVEFORM IN CONSUMABLE ELECTRODE GAS SHIELDED ARC WELDING AND ITS WELDING EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To control unstable welding state caused by disturbances such as fluctuation in the feeding speed of a welding wire and the irregular vibration of a molten pool. ;SOLUTION: In this welding current waveform control method, a short- circuited period and an arcing period are discriminated, and when it is the short-circuited period coming, a first short-circuited current 11 is made to flow during the preset energizing time Ts of the first short-circuited current, a second short-circuited current 12 is made to flow during the short-circuited period thereafter, and when it is the arcing period, a preset arc length detecting current 14 is made to flow during the preset arc length detecting time Ta, and simultaneously, while the arc voltage Va is integrated, the welding current 1a is controlled during the arcing period thereafter in a accordance with the size of the arc voltage integral value, thereby controlling an unstable welding state caused by disturbances.;COPYRIGHT: (C)2000,JPO