| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrogas arc welding method enabling the toughness of a heat-affected zone to be improved while suppressing incomplete fusion.SOLUTION: The electrogas arc welding method has a first movement step of moving a plurality of welding torches in a first direction and a second movement step of moving the plurality of welding torches in a second direction. The first movement step causes the top first torch 1 of the plurality of welding torches moving in the first direction to generate an arc 31 and causes a second torch 2 disposed rear of the first torch 1 in the first direction to move to pass through a molten pool 30 formed by the first torch 1 without generating the arc 31. The second movement step causes the second torch 2 to generate the arc 31, causes the top in the second direction to move, and causes the first torch 1 to move to pass through a molten pool 30 formed by the second torch 2 without generating the arc 31.SELECTED DRAWING: Figure 2 |
