| 摘要 |
A MIG torch (500) comprises a contact tube (501) and an auxiliary electrode (570) made from carbon, which is electrically connected to the contact tube (501). In a start phase, a primary welding arc (531) is started between an MIG wire (510) and a workpiece (1), with stationary wire. The primary arc melts a small portion of the MIG wire, but then reaches the auxiliary electrode (570), and keeps on burning there stationary, wherein the workpiece (1) does melt but not the MIG wire (510). When a welding pool (2) is sufficiently large, the wire feed is started. |
