| 摘要 |
PROBLEM TO BE SOLVED: To secure good welding quality by setting at least one among first/ second AC pulse current groups, a peak current energizing time and its current value, a base current energizing time and its current value, a straight polarity DC current to a different value and increasing an average arc length of a high arc time period than an average arc length of a low arc time period. SOLUTION: AAC pulse current is formed with a pulse to cause a droplet transfer at a reverse polarity and a straight polarity DC current not to cause a droplet transfer at a straight polarity. A first AC pulse current group repeats a high time period of a large arc length. A second AC pulse current group repeats a low time period of a small arc length. The first AC pulse group and the second AC pulse group are alternately repeated, welding is conducted. It is preferable to weld with reducing the change between a EN ratio at high arc length and a EN ratio at low arc length.
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