Method of ameliorating the residual stresses in metallic duplex

Details Method of ameliorating the residual stresses in metallic duplex Method of ameliorating the residual stresses in metallic duplex

1987-10-28

1989-02-28

Godici, Nicholas P.

Metal fusion bonding

Process

Plural heat applying

148127, 148131, 219 85, 219 612, 219243, C21D 100, C21D 908

Patent

active

048078018

ABSTRACT:
A method of ameliorating the residual stresses in a metallic duplex tube and the like and an apparatus therefor, wherein the duplex tube includes a main tube defining the outer tube, and a thermal sleeve defining the inner tube which is inserted to the outer tube, the thermal sleeve being welded onto the inside of the main tube at its root. The method comprises the steps of supplying cooling water in the duplex tube; fitting a restraining ring externally onto the outer surface of the main tube at a position corresponding to the thermal sleeve root; and heating the main tube from its outer surface so as to generate a temperature difference across the main tube wall. The apparatus thereof comprises a cooling water feeding means for supplying the cooling water in the double tube; a restraining ring fitted externally onto the outer surface of the main tube at a position corresponding to the thermal sleeve root; and heating means for heating the main tube from its outer surface so as to generate a temperature difference across the main tube wall.

REFERENCES:
patent: 4449281 (1984-05-01), Yoshida et al.
patent: 4608101 (1986-08-01), Umemoto
patent: 4726856 (1988-02-01), Tanaka
patent: 4731131 (1988-03-01), Sakata et al.

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