| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarity switching short circuiting arc welding method in which a welding wire is fed at a constant rate and a short circuit state Ts and an arc state Ta are repeated, and welding is performed by switching electrode positive polarity welding and electrode negative polarity welding by switching the output polarity of a welding power supply during the welding according to the predetermined polarity switching signal Sa, and the method by which the occurrence of arc interruption and generation of the surge voltage in switching the polarity are suppressed. SOLUTION: When the polarity switching signal Sa is changed (at the time t1), and when the first short circuit occurs (at the time t2) from the changing time, the welding current i is dropped to a lower value Ii during the predetermined short circuit initial period Ti. The output polarity of the welding power supply i is switched at the time elapsing the short circuit initial period Ti (at the time t3), and then, the welding current i is increased to release the short circuit state. COPYRIGHT: (C)2006,JPO&NCIPI
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