| 摘要 |
PROBLEM TO BE SOLVED: To enhance the arc start performance of the consumable electrode AC arc welding. SOLUTION: A welding wire is fed at the initial feed rate Fi at the arc start, the DC arc welding with the DC welding current Idc conducted with only the electrode positive polarity is performed during the initial period Tdc of several hundreds ms, and thereafter, the welding is changed to the AC arc welding with the AC welding current conducted. The welding is performed while changing the feed rate Wf from the initial feed rate Fi to the regular feed rate Fc at the predetermined slope Sf. The initial feed rate Fi is set to be substantially equal to the average AC welding current value Iav, the initial period Tdc is set so that the bead shape by the DC arc welding is substantially identical to the bead shape by the AC arc welding, and the slope Sf is set to be substantially proportional to the rate of change of the wire melting rate when the DC welding current Idc is changed to the AC welding current. COPYRIGHT: (C)2006,JPO&NCIPI
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