| 摘要 |
By the present invention, in order to suppress cold cracking, consumable electrode type arc welding is placed at the preceding side and laser welding is placed at the succeeding side with respect to the direction of weld progress, using a high-strength steel sheet having a tensile strength of at least 780 MPa as the welding subject, the distance between the position at which a welding wire for arc welding is aimed and the position of laser beam irradiation is set to a range of 3-5 mm, the electrode angle for arc welding is set to a sweepback angle in the range of 20-60° toward the direction of weld progress, and the incidence angle of the laser beam for laser welding is set to an angle in the range of 0-30° in the direction of weld progress from the vertical direction. |
