Ishikawajima-harima Jukogyo Kabushiki Kaisha

Daiichi Koshuha Kogyo Kabushiki Kaisha

Toshio Ino

Kazuo Yoshida

Masanori Terasaki

Tetsusho Kuriwaki

Miharu Hirado

Tsukasa Maenosono

Tadao Koga

A heating method and heating apparatus for uniformly or substantially uniformly heating a predetermined portion of main and branch pipes including a welded joint therebetween of a main-and-branch-pipe assembly, thereby relieving the residual stress in the welded joint between the main and branch pipes. The defects and problems encountered in the conventional residual-stress-relief treatment processes can be substantially overcome such as complication in winding fabrication at the branch pipe which results in bad control of temperature; a mock-up test being needed for fabrication of an inductor; and existence of a non-heated zone resulting in unbalance of the stresses so that the effects of the residual stress-relief treatment are reduced.

Induction heating method and apparatus for relieving residual stress in

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Yokohama, Japan

Toshio Ino