ALUMINUM ALLOY BRAZING FILLER METAL FOR BRAZING HEAT EXCHANGER AND ALUMINUM ALLOY BRAZING SHEET FOR HEAT EXCHANGER

摘要

PURPOSE: To satisfactorily braze a high strength Al alloy with a comparatively low melting point for a heat exchanger. ;CONSTITUTION: A brazing filler metal containing 5-15% Si, 0.1-1% Cu, and 0.5-8% Zn, and containing 0.2-2% Mg, if desired, and made of Al and inevitable impurities as the remainders, is obtained. Further, adequate amounts of Bi, Be, In, Sn, Pb, Ga, Na, K, Ca, and Sr are selectively added, if desired. Also, a brazing sheet is formed by clothing a brazing filler metal on one side or both sides of a core material containing, by wt., 0.5-1.5% Si, and 0.3-0.8% Cu, and the remainder Al, with Al and inevitable impurities. Further, adequate amounts of Mg, Zr, Cr, Ti, and V are added, if desired. Thus, the melting point of the brazing filler metal is lowered to a proper temperature, and even a high strength Al alloy can be effectively and satisfactorily jointed.;COPYRIGHT: (C)1994,JPO&Japio