Method of improving residual stress in circumferential weld zone

Details Method of improving residual stress in circumferential weld zone Method of improving residual stress in circumferential weld zone

1987-02-17

1988-09-20

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148127, 148154, C21D 950

Patent

active

047723360

ABSTRACT:
A method for improving residual stress in a circumferential weld zone of a piping and the like which includes preventing deformation of the weld zone, and causing a local expansion or contraction of a portion of the piping axially spaced from the weld zone thereby effecting a plastic working so as to increase or decrease the diameter of piping. The method can effectively be applied to apparatus and pipe system which are used in a corrosive environment and under action of a static or dynamic outer load.

REFERENCES:
patent: 4168190 (1979-09-01), Eguchi et al.
patent: 4229235 (1980-10-01), Matsuda et al.
patent: 4354883 (1982-10-01), Terasaki
patent: 4505763 (1985-03-01), Sugihara et al.

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