Patent ID: 8049140

Claim:
A pulse arc welding control method in which a peak current and a base current of a welding current are alternately supplied in a form of a pulse between a welding wire and a welding base material, the method comprising: storing a relationship between a lapse of time from a short circuit of the welding wire and the welding base material and a gradient of the welding current, the gradient being smaller than a gradient at a pulse rise of a current waveform of the pulse; detecting the short circuit between the welding wire and the welding base material; applying the welding current having the gradient smaller than the gradient at the pulse rise of the current waveform of the pulse on detecting the short circuit; and decreasing the welding current so as to fall vertically to a first current not smaller than a first predetermined lower limit, the first predetermined lower limit having a current value greater than that of the base current, on detecting a neck that appears just before recovery from the short circuit, wherein a length of time elapsed from occurrence of the short circuit is obtained, and the gradient of the current waveform in a short-circuit condition is controlled according to the length of time elapsed from occurrence of the short circuit based on the relationship stored, wherein the longer the time elapsed from occurrence of the short circuit, the greater the gradient of the current waveform applied in the short-circuit condition, and wherein the welding current is decreased to a second current not smaller than a second predetermined lower limit on detection of the short circuit between the welding wire and the welding base material, the welding current is maintained at the second current for a predetermined period by carrying out constant current control, and then the current having the gradient smaller than the gradient at the pulse rise of the current waveform of the pulse is applied.