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Abstract

This relates to a process for controlled atmosphere brazing including, brazing an aluminium alloy without flux in a controlled atmosphere, while using brazing sheet including an aluminium alloy core upon which on at least one side a layer of filler alloy is clad. The filler clad layer has an inner-surface and an outer-surface, the inner-surface is facing the core and the outer-surface is devoid of any further metallic based layers. The filler alloy has a composition which is Na-free, Li-free, K-free, and Ca-free, and includes, in wt. %: Si 3% to 15%, Mg 0.05% to 0.5%, one or more elements selected from the group of: (Bi 0.03% to 0.2%, Pb 0.03% to 0.2%, Sb 0.03% to 0.2%, and the sum of these elements being 0.2% or less), Fe 0 to 0.6%, Mn 0 to 1.5%, the balance aluminium and incidental impurities.

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First Claim