Method of relieving residual stress in metal pipe

Details Method of relieving residual stress in metal pipe Method of relieving residual stress in metal pipe

1986-03-31

1988-03-15

Spruill, Robert L.

Metal deforming

By application of fluent medium, or energy field

Using fixed die

72 62, 72 54, 29421R, B21D 2600

Patent

active

047304740

ABSTRACT:
A method of relieving residual stress in a metal pipe comprises the steps of applying, by using a pressure medium, a low pressure to an interior of the metal pipe placed in dies, and applying, while preventing the buckling, an axial compression load to the pipe so as to effect a uniform plastic deformation of the entire metal pipe while maintaining the desired shape of the pipe, thereby relieving the residual stress in the metal pipe.

REFERENCES:
patent: 2168641 (1939-08-01), Arbogast
patent: 2203868 (1940-06-01), Gray et al.
patent: 3216092 (1965-11-01), Arbogast
patent: 3611768 (1971-10-01), Odagaki
patent: 3974675 (1976-08-01), Tominaga
patent: 3986654 (1976-10-01), Hart et al.
patent: 4590655 (1986-05-01), Javorik

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