PURPOSE: To permit use of a gold alloy brazing filler metal for brazing of hard products and to lower the m. p. thereof so that the range of the liquids line temp. and solidus line temp. thereof is narrowed and brazing workability is enhanced by limiting the component compsn. of said brazing filler metal to a specific component compsn. CONSTITUTION:The component compsn. of the gold alloy brazing filler metal is limited to the compsn. consisting of 12-25% Ag, 8-20% Cu, 4-15% In, 8-15% Ga, and 1-10% Pd and the balance Au (the content is 30 55%) and inevitable impurities. Since this brazing filler metal has high hardness, the metal is usable for brazing of the hard products and since said brazing filler metal has the low m.p. and the narrow temp. range width of the liquids line temp. and solidus line temp., the excellent brazing workability is obtd. Since the metal has the color tone which is nearly silver white, the metal does not impair the ornamental and aesthetic value of the white hard products consisting of an Au-Pd-Pd series alloy, Au-Ni series alloy and further Ag-Pd series alloy when this brazing filler metal is used for brazing of these products.
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