Joining of metal surfaces

Details Joining of metal surfaces Joining of metal surfaces

1975-10-06

1976-04-20

Hall, Carl E.

Metal fusion bonding

Process

With pretreating other than heating or cooling of work part...

148 23, 148 26, 228223, B23K 3102, B23K 3536

Patent

active

039513289

ABSTRACT:
In methods of joining metal surfaces involving heating to a temperature above about 560.degree.C, the use of a flux comprising a mixture of potassium fluoaluminates. Particularly for brazing aluminum, a flux consisting essentially of potassium fluoaluminate complexes (e.g. KAlF.sub.4 and K.sub.3 AlF.sub.6) may be employed, having a composition corresponding to an AlF.sub.3 /KF ratio, in parts by weight, between about 65:35 and about 45:55. The flux is essentially free of unreacted potassium fluoride and may be in divided solid form.

REFERENCES:
patent: 3192076 (1965-06-01), Balass et al.
patent: 3580748 (1971-05-01), DeLong
patent: 3620716 (1971-11-01), Hess
Brazing Manual, American Welding Society, Inc., 1963, pp. 33 and 54.

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