| 摘要 |
PURPOSE:To reduce a welding cost by setting a welding heat input to a specified value or above, and executing a continuous multi-layer welding by a carbonic acid gas cored wire. CONSTITUTION:When a CO2 cored wire 1 is used, and continuous welding is executed to a base metal 6 without cutting an arc 3, a welding heat input being a welding condition is set to a value of >=20kJ/cm, and welding is executed without executing slag peeling in plural passes. Also, an oscillating speed is made constant, the number of times of oscillation per unit time is lowered, and multi-layer welding is executed by remelting a solidified slag 5 even against an increase of a groove width. Since the welding heat input has been set to >=20kJ/cm, the solidified slag 5 is remelted, and continuous multi-layer welding can be executed without discontinuing the arc 3. Accordingly, the welding efficiency is improved, and the welding cost is reduced.
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