A method of butt welding steel plates includes: butting two steel plates (1) together, to form a Y groove having an opening portion (2) in an upper part and a root face portion (3) in a lower part; joining the two steel plates at the opening portion (2) of the Y groove by submerged arc welding, to form submerged arc weld metal (4) whose Ti content is 0.030 mass% to 0.100 mass%, B content is 0.0030 mass% to 0.0080 mass%, and [%Al]/[%O] is in a range of 0.5 to 1.2 where [%Al] is Al content in mass% and [%O] is O content in mass%; and joining the two steel plates at the root face portion (3) of the Y groove by laser welding, to form laser weld metal (5) so that the laser weld metal (5) enters into the submerged arc weld metal (4).
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