| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that a ball of a wire end at the completion of an welding is not formed in a proper shape, which causes an arc start error that requires a production line stop or extra-aftertreatment, and which leads to a productivity decline. SOLUTION: The control method includes: a step for reducing a current from a steady welding current to a first current that is lower than the steady welding current before the stop of welding output power; a step for maintaining the first current for a first prescribed time; a step for reducing a voltage from a steady welding voltage to a first voltage that is lower than the steady welding voltage before the stop of welding output power; a step for stopping the welding output power by stopping an application of the first voltage after a lapse of the first prescribed time; a step for applying a second voltage for a third prescribed time after a lapse of a second prescribed time from the stop of welding output power; a step for determining that the wire and a base material are open after an occurrence of short circuit between them when a detection voltage in the third prescribed time falls less than a first threshold, and after that, the detection voltage increases more than the fallen voltage. COPYRIGHT: (C)2011,JPO&INPIT |
