| 摘要 |
PROBLEM TO BE SOLVED: To provide a short circuiting arc welding method using an alternating current consumable electrode, which can suppress an unstable state of the droplet transfer accompanying the switching of polarity to obtain good welding quality. SOLUTION: The short circuiting arc welding method using the alternating current consumable electrode includes the steps of: repeating a short circuit period Ts during which a short circuit current according to a short circuit current waveform parameter is applied and an arc period Ta during which an arc current according to a constant voltage characteristic is applied; alternatively switching the output polarity of a welding power source between an electrode positive polarity EP and an electrode negative polarity EN at a predetermined polarity switching timing during the short circuit period Ts; and performing welding by setting the short circuit current waveform parameter at a different value between an electrode positive polarity period Tep and an electrode negative polarity period Ten, wherein the output polarity of the short circuit current waveform parameter is switched during the short circuit period Ts, and after the short circuit is released and generates arc (t4), is switched to a value corresponding to each output polarity. COPYRIGHT: (C)2009,JPO&INPIT
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