Induction heating method and apparatus for relieving residual st

Details Induction heating method and apparatus for relieving residual st Induction heating method and apparatus for relieving residual st

1985-05-29

1987-08-18

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 85, 219 1057, 219 1071, 219 1079, 148127, 266129, H05B 640

Patent

active

046878947

ABSTRACT:
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.

REFERENCES:
patent: 1813591 (1931-07-01), Ulrey
patent: 2933584 (1960-04-01), Thielsch
patent: 4258241 (1981-03-01), Soworowski
patent: 4354883 (1982-10-01), Terasaki
patent: 4505763 (1985-03-01), Sugihara et al.

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