Electric heating – Metal heating – By arc
Patent
1995-07-05
1997-10-07
Shaw, Clifford C.
Electric heating
Metal heating
By arc
148524, 219 7612, 219127, 228165, B23K 904
Patent
active
056744196
ABSTRACT:
Disclosed is a highly reliable weld repairing method to repair a crack defect in structures and apparatus inside pressure vessels of nuclear reactors, while preventing generation of new crack defects in the structures and apparatus during the repairing. These structures and apparatus are made of any of stainless steel and Ni-base alloys, and are irradiated with high energy corpuscular ray during operating period of the reactor. The repairing method includes the steps of eliminating a region of the structure or the apparatus including a portion having the crack defect, and executing spot welding at a surface of the region continuously or interruptedly in a manner so as to form a first welded layer in a manner that each of the spot welded spots is half-overlapped with adjacent welded spots. Additionally, welding for forming at least a second layer, on the first welded layer, so that the at least a second layer is not deeper than a weld penetration thickness of the first welded layer can be performed.
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Koide Hiroo
Matsumoto Toshimi
Morisawa Junichiro
Tamai Yasumasa
Uraki Keiichi
Hitachi , Ltd.
Shaw Clifford C.
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