Brazing flux and method of using the same

Details Brazing flux and method of using the same Brazing flux and method of using the same

1991-09-27

1992-10-20

Seidel, Richard K.

Metal fusion bonding

Process

With protecting of work or filler or applying flux

22826317, 148 26, B23K 120

Patent

active

051563266

ABSTRACT:
The invention provides a brazing flux for brazing metal and a method of using the same. More particularly, the invention provides a brazing flux for use in joining pieces of aluminum or aluminum alloys. The brazing flux comprises from about 62 percent by weight to about 74 percent by weight hydrated potassium cryolite and from about 26 percent by weight to about 38 percent by weight AlF.sub.3. The hydrated potassium cryolite comprises K.sub.3 AlF.sub.6 and K.sub.2 AlF.sub.5.H.sub.2 O. Preferably, the brazing flux is substantially free of KAlF.sub.4 and unreacted KF. More particularly, the brazing flux contains no KAlF.sub.4 and no unreacted KF. The brazing flux is capable of displaying a melting temperature as low as 560.degree. C. (1040.degree. F.).

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