Heat-treating method of weld portion of piping system and heatin

Details Heat-treating method of weld portion of piping system and heatin Heat-treating method of weld portion of piping system and heatin

1982-06-23

1985-03-19

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

266129, 219 1043, 219 1079, C21D 130

Patent

active

045057630

ABSTRACT:
Herein disclosed are a method of heat-treating a weld zone of a piping system, in which the outer wall of a pipe is heated by means of a heating coil, while a coolant is present in said pipe, to establish a temperature difference between the inner and outer walls of said pipe thereby to prevent the weld zone of said pipe from corroding and cracking due to stress, and a heating coil therefor. The aforementioned heating coil is wound on the parent tube and the pipe welding desk generally concentrically thereof thereby to heat substantially uniformly all over the region of said weld zone.

REFERENCES:
patent: 2249909 (1941-07-01), Pasarev
patent: 2303408 (1942-12-01), Soderholm
Boerger et al., "Load Coil for RF Coupling", IBM Technical Disclosure Bulletin, vol. II, No. 7, Dec. 1968.
Ishikawjnia-Harenia, Eng. Rev., vol. 18, No. 1, Jan. 1978.

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