Method of brazing aluminum employing fluoaluminate flux

Details Method of brazing aluminum employing fluoaluminate flux Method of brazing aluminum employing fluoaluminate flux

1984-06-20

1985-12-03

Ramsey, Kenneth J.

Metal fusion bonding

Process

With protecting of work or filler or applying flux

22826317, B23K 35362

Patent

active

045561656

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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