Patent ID: 6919534

Claim:
A welded joint, comprising: an I-shaped joint groove in a base metal of high strength, heat resistant steel filled with multi-pass buildup welding, said I-shaped joint groove having a toe, a width X and a root, a weld face and a heat affected area formed by said welding; and a multi-layered weld cap atop the weld face that fuses at least a part of said heat affected area; wherein said high strength, heat-resistant steel is ferrite type heat resistant steel; wherein a toe of said I-shaped joint groove is formed into a tapered portion broadening upward with a slow grade; and wherein a fusion area on the heat affected area is formed by shifting a welding line from a toe of said joint groove and extending the welding line over an extended area having a width T′ that is slightly wider than a width T of the heat affected area on the surface of the base metal in order to form said multi-layered weld cap to cover said extended area, and said multi-layer weld cap extending over a width X+2T′ which is wider than the groove width X; and wherein the width X is constant along a majority of the distance of said I-shaped joint groove between a top surface and a bottom surface of said base metal.