Ishikawajima-Harima Jukogyo Kabushiki Kaisha

Daiichi Koshuha Kogyo Kabushiki Kaisha

Satoru Tsushima

Kazuo Yoshida

Masanori Terasaki

Tsukasa Maenosono

Tetsusho Kuriwaki

Miharu Hirado

Tadao Koga

Mitsuru Sugimori

A heating method and apparatus for effecting the residual-stress-relief treatment of a welded joint in a pipe line. A welded joint between main pipes, between a main pipe and a branch pipe, between a main pipe and a pipe base or between a branch pipe and a pipe seat and a portion adjacent to the welded point are uniformly or substantially uniformly heated by an inductor which can be varied into configurations according to the performance of the welded joint. The problems encountered in the conventional residual-stress-relief treatment can be substantially overcome.

Induction heating method and apparatus for relieving residual stress in

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Yokohama, Japan

Satoru Tsushima