| 摘要 |
In a method and an apparatus for controlling AC pulse arc welding executed by supplying a welding current (Iw) flowing between a welding wire (1) and an object (2) to be welded with feeding the welding wire (1) at a feeding speed corresponding to a predetermined feeding speed setting signal (Ws), a one-period process for supplying the welding current (Iw) is repeatedly executed. The one-period process includes a first process during a peak time interval (Tp), a second process during a negative electrode time interval (Ten), and a third process during a base time interval (Tb). The one-period process further includes a fourth process during a switching current interval (Tc), inserted between the peak time interval (Tp) and the negative electrode time interval (Ten), for supplying a welding current (Iw) having a switching current (Ic) for stopping growth of droplet (1a) which is smaller than a threshold current with a positive electrode polarity. <IMAGE> |
