US 11,872,663 B2
Repair welding method
Masaki Honda, Tokyo (JP); Toshiaki Nishio, Tokyo (JP); Nobuyoshi Komai, Tokyo (JP); Takumi Tokiyoshi, Tokyo (JP); Masaaki Fujita, Yokohama (JP); Kimihiko Tominaga, Yokohama (JP); Hiroyuki Ohyama, Yokohama (JP); Fumitoshi Sakata, Yokohama (JP); Koichi Teshima, Yokohama (JP); Eiji Murakami, Yokohama (JP); Akinori Yamaguchi, Yokohama (JP); and Fumio Nishi, Yokohama (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/258,240
Filed by MITSUBISHI POWER, LTD., Yokohama (JP)
PCT Filed Jul. 19, 2019, PCT No. PCT/JP2019/028529
§ 371(c)(1), (2) Date Jan. 6, 2021,
PCT Pub. No. WO2020/017649, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. 2018-136325 (JP), filed on Jul. 20, 2018.
Prior Publication US 2021/0268612 A1, Sep. 2, 2021
Int. Cl. B23K 31/00 (2006.01); B23P 6/04 (2006.01); B23K 31/02 (2006.01); B23K 31/12 (2006.01); F16L 55/16 (2006.01); B23K 103/04 (2006.01); B23K 101/06 (2006.01)
CPC B23P 6/04 (2013.01) [B23K 31/027 (2013.01); B23K 31/12 (2013.01); F16L 55/1608 (2013.01); B23K 2101/06 (2018.08); B23K 2103/04 (2018.08)] 7 Claims
OG exemplary drawing
 
1. A repair welding method for a member in which a first end and a second end of a parent material are connected by welding, comprising:
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,
wherein, 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°,
wherein, in a cross-section including the parent material and the existing welded portion, the repair welding is performed from the parent material on a first end side to a weld metal of the existing welded portion, and
wherein an intermediate position between a position of the second heat-affected zone appearing on a surface of the parent material on the first end side and a position of the second heat-affected zone appearing on a surface of the weld metal of the existing welded portion is at the weld metal of the existing welded portion before removing the portion including at least a part of the first heat-affected zone.