Two-position sleeve brazing process

Details Two-position sleeve brazing process Two-position sleeve brazing process

1984-07-25

1986-11-04

Godici, Nicholas P.

Metal fusion bonding

Process

Plural heat applying

228232, 228126, 228132, 228183, B23K 3102

Patent

active

046206620

ABSTRACT:
A process for brazing a sleeve within a tube which is resistant to longitudinal expansion is disclosed herein. In the first step of the process, a thermally induced radial expansion is induced in the tube in a first longitudinal section of the tube which does not include the ring of brazing alloy which circumscribes the sleeve. In the second step of the process, a brazing heat is applied across the longitudinal section of the tube which does include this ring of brazing material. The residual tensile stress created by the thermally induced radial expansion in the tube avoids the creation of gaps in the braze joint between the sleeve and the inner walls of the tube. This process is particularly useful in creating high-quality braze joints in sleeving operations in nuclear steam generators, where the heat exchange tubes which need to be sleeved may be partially or completely prevented from expanding in the longitudinal direction due to sludge deposits in the generator.

REFERENCES:
patent: 2229405 (1941-01-01), Currier
patent: 2938993 (1960-05-01), Rudd
patent: 3571908 (1971-03-01), Pillia
patent: 3962767 (1976-06-01), Byerley

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