| 摘要 |
In order to provide a welding system capable of freely controlling dispersion and concentration of arc heat input at a groove face of base material, and ensure melting of the base material while restraining excessive weld heat input, in arc welding using a wire consumable electrode system, at a groove between members to be welded a position of a weld torch or feed speed of a wire is periodically varied, and welding is carried out by controlling a difference between the phase of the variation and a phase of an arc current waveform in accordance with a change in the arc current waveform.
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