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

1987-09-15

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

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

Patent

active

046941312

ABSTRACT:
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.

REFERENCES:
patent: 2184534 (1939-12-01), Smith et al.
patent: 2620433 (1952-12-01), Denneen et al.
patent: 3359398 (1967-12-01), Reinke et al.
patent: 4354883 (1982-10-01), Terasaki
patent: 4505763 (1985-03-01), Sugihara et al.

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