Method of mechanically prestressing a tubular apparatus

Details Method of mechanically prestressing a tubular apparatus Method of mechanically prestressing a tubular apparatus

1982-08-31

1984-09-11

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

29446, 29455R, 29516, 29520, 138148, 166 57, B23P 900

Patent

active

044701888

ABSTRACT:
A method of prestressing a tubular apparatus having coaxial inner and outer tubes which are connected to each other at axially spaced locations comprises, after the inner and outer walls are connected to each other and the tube is heat-treated or otherwise processed, reducing the diameter of the outer wall so that the outer wall is elongated. The elongation of the outer wall establishes a prestressed condition between the inner and outer walls, with the inner wall under tension and the outer wall under compression. The reduction in diameter of the outer wall can be accomplished by using a roll extrusion machine, a tube reducer or a draw bench.

REFERENCES:
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patent: 2693026 (1954-11-01), Simpelaar
patent: 2828537 (1958-04-01), Pischke et al.
patent: 2924245 (1960-02-01), Wilson
patent: 3149513 (1964-09-01), Dollens
patent: 3246394 (1966-04-01), Meyer
patent: 3608640 (1971-09-01), Wellhite
patent: 3693665 (1972-09-01), Veerling et al.
patent: 3863328 (1975-02-01), Arntz
patent: 4125924 (1978-11-01), Goetze
patent: 4375843 (1983-03-01), Itzinger et al.

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