Method of increasing the fatigue life and/or reducing stress con

Details Method of increasing the fatigue life and/or reducing stress con Method of increasing the fatigue life and/or reducing stress con

1994-07-15

1996-05-14

Jones, David

Metal deforming

By shot-blasting

B24C 700, B21J 100

Patent

active

055157076

ABSTRACT:
A method of increasing the fatigue life and/or reducing stress corrosion cracking of metal coiled tubing made from a continuous length of strip material by shot peening one or both sides of the strip material along substantially the entire length of the strip material prior to milling the strip material into tubing. The continuous length of strip material is made up of individual strips welded together in end to end abutting relation and the welds are finished before the strip material is shot peened. Alternatively, or in addition to shot peening at least the side of the strip material that forms the interior surface of the tubing, the exterior surface of the tubing is continuously shot peened as the tubing is wound onto a reel or spool.

REFERENCES:
patent: 2164267 (1939-06-01), Black
patent: 2214618 (1940-09-01), Kenyon et al.
patent: 2460657 (1949-02-01), Robinson
patent: 3886774 (1975-06-01), Stromstedt et al.
patent: 4086104 (1978-04-01), Kinoshita et al.
patent: 4100782 (1978-07-01), Clay
patent: 4230426 (1980-10-01), Avery, Jr. et al.
patent: 4863091 (1989-09-01), Dubois
patent: 5191911 (1993-03-01), Dubois
Understanding How Components Fail, Donald J. Wulpi American Society for Metals, 1985, pp. 74-78.
American Society for Metals, Dec. 1985--"On the Improvement of Fatigue Resistance and Safety of Butt Welds", Xiulin et al, pp. 5-8.
Tool Engineers Handbook, 1949--"Shot Peening", John C. Straub, pp. 1251-1257.
Welding Procedures and Application, L. Carl Love, 1975, p. 153

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