Method of producing multiple-wall, composite tubular structures

Details Method of producing multiple-wall, composite tubular structures Method of producing multiple-wall, composite tubular structures

1982-03-16

1984-05-22

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Shaping by direct application of fluent pressure

29447, 138140, 219 1043, B23P 1700

Patent

active

044492812

ABSTRACT:
A double-wall composite pipe is produced by inserting an inner pipe in an outer pipe, filling the inner pipe with cold water under pressure to cause the inner pipe to expand plastically into tight contact with the outer pipe, applying heat to the outer part of the outer pipe by high-frequency induction heating, thereby to establish a locally heated zone thereof around the circumference thereof and causing the heated zone to travel from one end to the other end of the outer pipe thereby to cause it to successively expand locally in diameter in the travelling heated zone. The pressure in the inner pipe then is removed, the pipes thereafter being permitted to attain the ambient temperature, thereby to obtain an interference fit therebetween.

REFERENCES:
patent: 2986847 (1961-06-01), Sato
patent: 3064344 (1962-11-01), Arne
patent: 3461523 (1969-08-01), Peehs et al.
patent: 3532476 (1970-10-01), Peehs et al.
patent: 4332073 (1982-06-01), Yoshida et al.
patent: 4377894 (1983-03-01), Yoshida et al.

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