PROCESS FOR FLUXLESS BRAZING OF ALUMINIUM AND BRAZING FILLER ALLOY FOR USE THEREIN
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United States of America Patent
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app pub date -
May 2, 2011
filing date -
Nov 10, 2008
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Abandoned
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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 having an inner-surface and an outer-surface, the inner-surface is facing the core, and wherein the filler alloy has a composition which is Na-free, Li-free, K-free, and Ca-free, and including, in wt. %: Si 3% to 15%, Cu 0.3% to 5%, Mg 0.05% to 1%, one or more elements selected from the group of: Bi, Pb, and Sb, and the sum of these elements being 0.35% or less, Fe 0 to 0.6%, Mn 0 to 1.5%, the balance aluminium.
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