Method for arc welding

摘要

A method for arc welding can control the increase slopes of the short-circuit current and the inflection point of the increase slopes in the welding start period to be smaller than in the steady-state welding period. Thus, the increase slopes of the short-circuit current and the inflection point are made different between the welding start period and the steady-state welding period, thereby reducing sputtering in the welding start period.

主权项

1. A method for arc welding in which welding is performed by alternating a short-circuit state and an arc state using a welding wire as a consumable electrode, the method comprising:
a first short-circuit welding for welding in a welding start period with a first short-circuit current; and a second short-circuit welding for welding in a welding steady period subsequent to the welding start period with a second short-circuit current, wherein: the first short-circuit current has a first increase slope, a second increase slope subsequent to the first increase slope and a first inflection point at which the first short-circuit current changes from the first increase slope to the second increase slope; the second short-circuit current has a third increase slope, a fourth increase slope subsequent to the third increase slope and a second inflection point at which the second short-circuit current changes from the third increase slope to the fourth increase slope; the third increase slope is steeper than the first increase slope; and the fourth increase slope is steeper than the second increase slope.