Mitsubishi Heavy Industries Limited

Fumio Nishi

Nobuyoshi Komai

Fujimitsu Masuyama

Masaaki Fujita

Takumi Tokiyoshi

Masaki Honda

Fumitoshi Sakata

Nobuhiko Saito

Toshiaki Nishio

Yasuhiro Ukeguchi

Hiroyuki Ohyama

Kimihiko Tominaga

Koichi Teshima

Akinori Yamaguchi

Eiji Murakami

Masahiko Hokano

Toshiyuki Imazato

Takeshi Miyazawa

A repair welding method according to at least one embodiment is for a member in which a first end and a second end of a parent material are connected by welding and includes: a step of removing a portion including at least a part of a first heat-affected zone of an existing welded portion of the member; and a step of performing repair welding after removing the portion. In a cross-section including the parent material and the existing welded portion, all intersection portions between the first heat-affected zone of the existing welded portion and a second heat-affected zone due to the repair welding have an intersection angle between the first heat-affected zone and the second heat-affected zone of 70° to 110°.

Repair welding method

A welding method and a welded joint for high strength, temperature resistant steels produce the same strength as the base metal in the welded joint, thereby resolving strength problems in the heat affected area by making a simple change to the welding method. Additionally, this advantage is extended to high strength ferrite heat resistant steels by providing a multi-pass buildup welding method for such high strength ferrite heat resistant steels. A multi-layered capfusion area extends past the heat affected areathat lies outside grooveand the surface area of the foregoing extension that is required to impart the same level of creep strength as is inherent in the base metal is based on the relationship between the groove width and the base metal thickness shown as hatched area in FIG.(B).

Welded joints in high strength, heat resistant steels, and a welding method therefor

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Nagasaki, Japan

Fumio Nishi