Patent ID: 8809736

Claim:
An arc welding method for welding using a welding wire as a consumable electrode by repeating a short-circuit state and an arc state, the arc welding method comprising: a determining step for determining an increasing gradient of a short-circuit current corresponding to a set current; a calculating step for calculating a difference between an output voltage and a set voltage; and a changing step for temporally changing the increasing gradient of the short-circuit current such that the output voltage is matched with the set voltage, based on the difference between the set voltage and the output voltage, wherein when the output voltage is smaller than the set voltage in the calculating step, the increasing gradient of the short-circuit current is changed so as to be steeper than the increasing gradient of the short-circuit current corresponding to the set current in the changing step, and the short-circuit state in the repeating of the short-circuit state and the arc state is shortened, and when the output voltage is larger than the set voltage in the calculating step, the increasing gradient of the short-circuit current is changed so as to be more gradual than the increasing gradient of the short-circuit current corresponding to the set current in the changing step, and the short-circuit state in the repeating of the short-circuit state and the arc state is lengthened.