| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding method capable of reliably tempering a heat-affected zone generated in a welding base material when forming an initial layer bead when executing the lap welding of remaining layer beads, and ensuring the excellent soundness of the welding base material.SOLUTION: In the welding method, a remaining layer bead 15 is lap-welded on an initial layer bead 13 formed on a welding base material 11, and a heat-affected zone 14 generated in the welding base material 11 when forming the initial layer bead 13 is tempered by the welding heat of the remaining layer bead 15. In this condition, when forming a first pass and a last pass of the remaining layer bead 15, a difference is formed in the application of the welding heat to the welding base material 11 on one side and on the other side in the width direction of the remaining layer bead 15 by scanning a welding torch 12 while inclining it inwardly in the width direction of the remaining layer bead 15. The side with the larger application of the welding heat is lapped on an area of an outer edge part in the width direction of the initial layer bead 13, the welding is executed while applying the welding heat to the heat-affected zone 14, and the heat-affected zone 14 is tempered. |
