Kobe Steel, Ltd.

Baini Jo

Eiji Sato

Akira Ogawa

Takeshi Yano

Gas-shielded arc welding in which the tip-to-work distance changes is configured so that fluctuations in welding current are curbed while arc length control is maintained. This is achieved with a corrected current calculating unit that includes a first controlling expression where a first gain Gis multiplied by an instantaneous voltage error value that is the difference between an instantaneous output voltage setting value and an output voltage detection value, and/or a second controlling expression where a second gain Gis multiplied by an average voltage error value that is the difference between an output voltage setting value and an average output voltage detection value of a pre-set period of time, determines an arc property gain Gand/or Gbased on a torch position detection value determined by a torch position determinator, and calculates a corrected current based on the first and/or the second controlling expression.

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Fujisawa, Japan

Baini Jo