| 摘要 |
PROBLEM TO BE SOLVED: To provide an arc start control method for two-electrode arc welding, a method that makes quick transfer possible to a regular welding condition and that also makes formation of superior weld bead possible. SOLUTION: The method includes: a step in which a wire W is made to approach a welding base material P at a slowed-down feeding speed Fw1, with a GMA arc welding voltage Vwa applied; a step in which the length of a GMA arc 6a is gradually made longer, after the wire W is brought into contact with the welding base material P, while the wire W is fed at a feeding speed Fw2 of an arc growing period, by gradually increasing the GMA arc welding voltage Vwa following the generation of the GMA arc 6a; and a step in which, after a plasma arc 6b is generated by a non-consumable electrode arc welding voltage Vwb, the feeding speed Fw is made a regular feeding speed Fw3 and in which regular welding is started by making the GMA arc welding voltage Vwa to be a voltage in the regular welding condition. COPYRIGHT: (C)2009,JPO&INPIT
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