| 摘要 |
PROBLEM TO BE SOLVED: To precisely perform arc welding to a lap joint including a sheet metal at low cost. SOLUTION: When performing the arc welding of the fillet part C of the lap joint, after bringing the tip of a welding wire 9 into contact with the sheet metal P1 on the one side, the welding wire 9 is moved to a position exceeding the fillet part C, and the welding wire 9 is made not to come into contact with both sheet metals P1, P2. After that, the welding wire 9 is moved to the fillet part C side, the welding wire 9 is brought into contact with the end face of the sheet metal P1 on the one side, and the welding is started. When bringing the welding wire 9 into contact with the sheet metal P1, after making the tip of the welding wire 9 approach the surface of the sheet metal P1, by projecting the tip of the welding wire 9 by using its elasticity, when the tip of the welding wire 9 comes into contact with the sheet metal P1, the welding wire 9 is locked.
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