Method of correcting distorted pipe end

Details Method of correcting distorted pipe end Method of correcting distorted pipe end

1979-08-03

1981-04-21

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

72393, B21D 4702, B21C 312

Patent

active

042625173

ABSTRACT:
In a method of correcting a distorted pipe end to an original substantially true circular cross-section, external loads are applied to the outer peripheral surface of the pipe adjacent to the end thereof to forcibly deform the pipe end to the substantially true circular cross-section. The external loads are maintained to keep this substantially true circular cross-sectional shape while an internal pressure is applied to the inner peripheral surface of the pipe end until a circumferential stress produced in the pipe reaches an amount which exceeds the yield stress of the pipe to give a radial permanent deformation to the pipe for thereby producing a circumferentially uniformly distributed residual stress in the pipe.

REFERENCES:
patent: 3016856 (1962-01-01), Cummings
patent: 3362603 (1968-01-01), Bauer et al.
patent: 3581546 (1971-06-01), Ragettli

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