Vacuum braze cycle for clad aluminum sheet

Details Vacuum braze cycle for clad aluminum sheet Vacuum braze cycle for clad aluminum sheet

1990-04-09

1991-01-29

Heinrich, Sam

Metal fusion bonding

Process

With protecting of work or filler or applying flux

228197, 228227, 22826317, B23K10310

Patent

active

049880365

ABSTRACT:
An improved heating cycle for brazing an assembly of clad aluminum sheet components having a hypoeutectic aluminum-silicon braze alloy cladding comprises a dwell at a temperature slightly above the eutectic melting point and effective to partially melt the cladding. The dwell is accompanied by vaporization of residual magnesium from the clad alloy to getter oxygen from about the assembly and enhanced disruption of oxide film on the cladding surface, which film would otherwise interfere with capillary flow of the braze alloy into joints. The eutectic temperature dwell provides a more uniform flow of braze alloy into seams and thereby produces a strong, leak-free joint in the brazed structure.

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patent: 4781888 (1988-11-01), Hagiwara et al.
patent: 4838474 (1989-06-01), Ohashi et al.

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