Abstract: An aluminum alloy composite material for brazing has a core member, an Al--Si filler member clad on one surface of the core member and an aluminum alloy cladding member clad on the other side of the core member. The core member is made of an aluminum alloy containing 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, and, as required, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of the Cu being restricted to 0.2 wt. % or less as an impurity. The cladding member is made of an aluminum alloy containing 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn, 0.1 to 1.0 wt. % of Si. The thickness of the core member is preferably, 2.5 times or more greater than that of the filler member, falling within a range of 0.1 to 1 mm.

Abstract: A high strength, corrosion-resistant alloy for brazing is disclosed, which alloy comprises 0.2-1.0 wt % of Cu, 0.1-0.5 wt % of Mg, 0.2-1.0 wt % of Si, and the balance of Al and inevitably present impurities. The weight ratio of Si/Mg is in the range of 1-2.5:1. The alloy may further comprise 0.03-0.5 wt % of Ni and/or one or more of Zr, Cr and Mn each in an amount of 0.05-0.5 wt %.

Abstract: A high strength, corrosion-resistant alloy for brazing is disclosed, which alloy comprises 0.2-1.0 wt % of Cu 0.1-0.5 wt % of Mg, 0.2-1.0 wt % of Si, and the balance of Al and inevitably present impurities. The weight ratio of Si/Mg is in the range of 1-2.5:1. The alloy may further comprise 0.05-0.5 wt % of Ni and/or one or more of Zr, Cr and Mn each in an amount of 0.05-0.5 wt %.

Abstract: An aluminum brazing sheet for use in brazing comprises;a core material composed of an aluminum alloy containing:0.2-1.0 wt % Cu,0.2-0.8 wt % Mg andat least one of the elements selected from:0.05-0.5 wt % Mn,0.05-0.5 wt % Zr,0.05-0.5 wt % Cr, andthe balance of Al and impurities, anda filler material composed of an Al-Si based alloy brazing material coated on one surface of said core material and a skin material composed of a sacrificial aluminum anode material at a purity higher than 99.0 wt % coated on the other surface of the core material. The aluminum brazing sheet according to this invention is satisfactory in the brazing property and also excellent in the corrosion resistance and the strength, which is suitable as the material for use in aluminum heat exchangers.

Abstract: A vacuum brazing sheet for use in drawn-cup type heat exchanger made of aluminum with the degree of closure from 0.2 to 4.0 cm.sup.2 /l, wherein a brazing material containing:Si 11-14 wt. %Mg 1.0-2.0 wt. % andthe balance of Al is clad on one or both surfaces of aluminum or aluminum alloy material.The brazing performance can be improved and stabilized, and higher yield can be obtained.

Abstract: Aluminum alloy composite materials for brazed heat exchangers are described, which comprise an Al core alloy essentially consisting of predetermined amounts of Si, Mg, Cu and at least one element selected from Mn, Cr and Zr, the balance being Al and inevitable impurities, and an Al alloy clad layer formed on one side of the core alloy which is in contact with an aqueous heat transfer medium. The clad layer has a thickness 3-20% based on the thickness of the composite material and a less-noble corrosion potential of 20-100 mV than the core alloy. A filler alloy may be formed on the other side of the core alloy.

Abstract: An aluminum-base brazing alloy containing essentially up to 2 wt % of Cu, 0.01 to 0.08 wt % of Ti, and the balance of Al and unavoidable impurities, with or without at least one component selected from the group consisting of 0.01 to 0.5 wt % of Zr, 0.05 to 0.5 wt % of Mn and 0.05 to 0.5 wt % of Cr.