Patent ID: 8653403

Claim:
A butt-welded joint, comprising: a pair of steel plates; a first weld metal that is formed at a butting portion of the pair of steel plates, from a side of a first surface of the butt-welded joint to a side of a second surface opposite the first surface by irradiation of a first high-energy density beam from the side of the first surface; and a second weld metal that is formed by irradiation of a second high-energy density beam to cover an end surface of the first weld metal at the side of the first surface, wherein a width W 1 of the first weld metal on the first surface and a width W 2 of the second weld metal on the first surface satisfy an equation 1.2≦W 2 /W 1 ≦3.5, and a depth of the second weld metal from the first surface is 2.0 mm to 10.0 mm, wherein a width W 3 of the first weld metal at a center of a plate thickness of the pair of steel plates is 15% or less of the plate thickness of the pair of steel plates, wherein the plate thickness of the pair of steel plates is 30 mm to 200 mm, and wherein the width W 1 of the first weld metal on the first surface is 2% to 30% of the plate thickness of the pair of steel plates.