| 摘要 |
PROBLEM TO BE SOLVED: To provide a butt weld method for a thick steel plate that enables a weld metal having an excellent tenacity to be obtained by simple means when a thick steel plate (10-40 mm thick) is butt-welded by combining laser welding with submerge arc welding, a butt weld joint for a thick steel plate by the butt weld method, and a weld structure having the butt weld joint.SOLUTION: In a butt weld method for a thick steel plate 1, a laser weld machine is disposed ahead in a direction of weld progress, and a submerge arc weld machine is disposed behind to individually form a molten pool by preceding laser welding and a molten pool by succeeding submerge arc welding, and the distance L(mm) between a laser irradiation point of laser welding and an arc point of submerge arc welding satisfies L≤1.2×10×v×t/(Q×C), and heat input Q(J/mm) of submerge arc welding satisfies Q≥0.5×10×Q×t/C.SELECTED DRAWING: Figure 1 |
