| 摘要 |
The purpose of the present invention is to reduce the amount of spatter production without detecting constrictions in a welding method in which forward feed and backward feed of welding wire is repeated cyclically. The feed speed (Fw) of the welding wire is switched cyclically between forward feed and backward feed to produce a short-circuit period and an arc period, and the welding current (Iw) is reduced during backward feed in the short-circuit period to shift to the arc period. The reduction in the welding current (Iw) is begun at the time point (t31) at which the backward feed state (Bd) has reached a predetermined standard state. The backward feed duration, the backward feed speed, the backward feed phase, or the backward feed quantity is used as this backward feed state (Bd). Due to this configuration, without detecting constrictions, the welding current (Iw) can be reduced by just an appropriate amount of time before the time point (t33) at which an arc is produced again, and this makes it possible to reduce the amount of spatter production. |
