Method of producing double-wall composite pipes

Details Method of producing double-wall composite pipes Method of producing double-wall composite pipes

1984-04-02

1986-07-08

Godici, Nicholas P.

Metal fusion bonding

Process

Encasing a rodlike core within a substantially coextensive...

228135, 228265, 29447, 156 86, B23K 3100, B23K 3106, B23P 1102

Patent

active

045988579

ABSTRACT:
In order to produce a double-wall composite metal pipe, a pipe assembly, made up of an outer pipe of carbon steel and an inner pipe of stainless steel inserted in the outer pipe with an annular clearance therebetween is caused to advance relative to a plastic working device such as die or a series of rollers. Before the pipe assembly is caused to pass through the plastic working device, the outer pipe is heated to cause it to expand thereby increasing the annular clearance between the inner and outer pipes and establishing a temperature difference between the outer and inner pipes. The heated outer pipe is constricted by device of the plastic working means and caused to plastically contract against the outer surface of the inner pipe, while the inner pipe is subjected to expanding force of a mandrel inserted in the inner pipe, the mandrel backing up the pipe assembly from within the inner pipe against the constricting action of the plastic working device. The pipe assembly thus subjected to the action of the plastic working device is cooled from the outside whereby the outer pipe is caused to shrink to firmly bind the inner pipe thereby to obtain a tighter fit between the pipes.

REFERENCES:
patent: 3025596 (1962-03-01), Ward et al.
patent: 3064344 (1962-11-01), Arne
patent: 3604102 (1971-09-01), Saluggia et al.
patent: 4449281 (1984-05-01), Yoshida et al.
patent: 4493363 (1985-01-01), Fredriksson et al.

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