| 摘要 |
A method for butt welding steel plates, said method comprising: butting two steel plates (1) and forming a Y-shaped groove provided with an opening (2) in the upper part and a root face (3) in the lower part; welding the opening (2) of the Y-shaped groove by submerged arc welding to form a submerged arc welded metal (4) which contains 0.030-0.100 mass% of Ti and 0.0030-0.0080 mass% of B and in which the ratio [%Al]/[%O] [wherein [%Al] stands for the content (mass%) of Al and [%O] stands for the content (mass%) of O] is in the range of 0.5-1.2; and then welding the root face (3) of the Y-shaped groove by laser welding to form a laser welded metal (5) so that said laser welded metal (5) intrudes into said submerged arc welded metal (4). |
