Aluminum-lithium filler alloy for brazing
AssigneeKaiser Aluminum & Chemical Corporation
InventorDavid L. Childree
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Abstract
An aluminum brazing alloy composite sheet is provided which can be utilized in both the vacuum brazing process and the controlled atmosphere brazing process for the brazing of aluminum parts. The brazing alloy composite sheet consists of an aluminum core alloy of the 3XXX, 5XXX or 6XXX type clad at least on one major surface with a lithium-containing aluminum filler alloy containing from about 0.01% to about 0.30% by weight lithium. The core alloy may contain up to about 2% by weight magnesium and is suitable for producing aluminum alloy heat exchanger assemblies, such as radiators or evaporators.
Claims5
A brazing sheet composite for joining aluminum parts by either a vacuum brazing process or the controlled atmosphere brazing process, which comprises:
- (a) an aluminum alloy core material;
- (b) a lithium-containing aluminum filler alloy cladding on the core material, the cladding being applied to at least one of the major surfaces of the core material,
- wherein the aluminum alloy core material consists essentially of silicon up to about 0.2%, magnesium up to about 2%, manganese up to about 2%, iron up to about 0.3%, copper up to about 0.40%, titanium up to about 0.1%, total impurities not exceeding about 0.15%, balance aluminum;
- and wherein the cladding consists essentially of silicon within the range from about 4% to about 18%, lithium within the range from about 0.01% to about 0.30%, zinc up to about 2%, manganese up to about 1%, iron up to about 0.30%, copper up to about 0.10%, magnesium not exceeding about 0.05%, impurities not exceeding a total of 0.15%, balance aluminum.
Dependencies are inferred from the claim text.