Flux for brazing aluminum and method of employing the same

Details Flux for brazing aluminum and method of employing the same Flux for brazing aluminum and method of employing the same

1983-05-13

1984-10-09

Rosenberg, Peter D.

Metal treatment

Compositions

Fluxing

75 68R, B23K 3534

Patent

active

044759606

ABSTRACT:
In the brazing of aluminum a flux composed of a mixture of alkali metal fluoaluminates, with or without admixed AlF.sub.3, is employed. The flux has a composition of AlF.sub.3 about 53-62%, KF about 35-44%, and LiF about 2-7%, in terms of simple compounds. The flux has a liquidus temperature in the range of 490.degree.-560.degree. C. depending on its actual composition. The flux is of particular utility when brazing aluminum containing 0.4-2% magnesium and/or having a low solidus temperature and is preferably employed in an atmosphere of a dry, inert gas.

REFERENCES:
patent: 2854328 (1958-09-01), Rossborough
patent: 3269828 (1966-08-01), Hale
patent: 3865578 (1975-02-01), Takashima
patent: 3892561 (1975-07-01), Takashima

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