Method and apparatus for unstressing pipe and the resulting pipe

Details Method and apparatus for unstressing pipe and the resulting pipe Method and apparatus for unstressing pipe and the resulting pipe

1977-11-10

1979-05-29

Larson, Lowell A.

Metal deforming

Process

With attenuation, thickening, elongating or shortening of...

B21D 312

Patent

active

041563603

ABSTRACT:
Circumferential stresses in tubes are relieved by exerting an axial pull on tube sufficient to elongate the tube at least 0.2%, and maintaining the pull on the tube for a predetermined period of time. The extent of elongation can be as much as 1% and the axial pull can be maintained for several minutes. The technique is particularly useful for substantially reducing or eliminating circumferential stresses in thin wall tubes which are created by straightening the tube with hyperbolic profile rollers.

REFERENCES:
patent: 2336524 (1943-12-01), Bannister
patent: 3031750 (1962-05-01), Von Planck
patent: 3469425 (1969-09-01), Spurr et al.
patent: 3678727 (1972-07-01), Jackson

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