Fluxless brazing of aluminum in inert gas

Details Fluxless brazing of aluminum in inert gas Fluxless brazing of aluminum in inert gas

1978-03-13

1980-12-23

Ramsey, Kenneth J.

Metal fusion bonding

Process

With protecting of work or filler or applying flux

228219, 228239, 228263F, B23K 119

Patent

active

042405742

ABSTRACT:
A method of brazing aluminum parts in an inert gas atmosphere is disclosed. The brazed filler metal is controlled to contain a ternary alloy of aluminum-silicon-magnesium and the base aluminum parts are controlled to contain a binary alloy of aluminum-magnesium. Magnesium in the base metal is controlled to 0.4-1.2% and in the filler metal it is controlled to 0.2-0.6%; in the filler metal only, silicon is controlled to 7-12%. The assembled base metal parts and filler metal are subjected to differential heating rates, one rate being limited to at least 50.degree. C./minute when the metal parts reach temperatures in the range of 400.degree.-550.degree. C., and a conventional rate when outside said temperature zone. As a result, three physical parameters are caused to occur simultaneously: initiation of porosity in oxide film on the metal parts, transport of magnesium to the oxide interface and reaction with the oxide, and initial melting of the filler metal as well as wettings of the oxide by the filler metal.

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