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

B - Operations, Transporting

23

K

148/62.1

B23K 35/363 (2006.01) B23K 35/36 (2006.01)

Patent

CA 1206076

A B S T R A C T In the brazing of aluminium a flux composed of a mixture of alkali metal fluoaluminates, with or without admixed AlF3, is employed. The flux has a composition of AlF3 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°-560°C depending on its actual composition. The flux is of particular utility when brazing aluminium containing 0.4-2% magnesium and/or having a low solidus temperature and is preferably employed in an atmosphere of a dry, inert gas.

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