Electric heating – Metal heating – By arc
Patent
1995-06-20
1997-12-09
Shaw, Clifford C.
Electric heating
Metal heating
By arc
228232, B23K 900
Patent
active
056956665
ABSTRACT:
In a case of welding a highly neutron-irradiated austenitic stainless steel, the portion to be welded is heated under a condition of temperature and time in a predetermined range before welding. In this moment, chromium carbide (Cr.sub.23 C.sub.6) precipitates in the grain boundaries of the stainless steel. Welding is performed the state described above is obtained. Since, chromium carbide has been precipitated in the grain boundary by the heat treatment before welding, any helium atoms generated through nucleus conversion of Ni, are apt to be trapped with the chromium carbide, thereby reducing the number of gas bubbles formed by gathering the helium atoms in the grain boundaries. As a result, since decrease in the strength of the grain boundaries due to helium gas bubbles is moderated, it is possible to prevent occurrence of cracks during welding.
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Aono Yasuhisa
Kaneda Jun'ya
Kato Takahiko
Nagata Tetsuya
Hitachi , Ltd.
Shaw Clifford C.
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