Process for fluxless brazing of aluminium and brazing sheet...

B - Operations – Transporting – 32 – B

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B32B 15/01 (2006.01) B23K 35/02 (2006.01) B23K 35/28 (2006.01) B23K 35/38 (2006.01)

Patent

CA 2740336

The invention relates to a process for controlled atmosphere brazing comprising, brazing an aluminium alloy without flux in a controlled atmosphere, while using brazing sheet comprising of 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 the outer-surface is devoid of any further metallic based layers, and wherein the filler alloy has a composition which is Na-free, Li-free, K-free, and Ca-free, and comprising, in wt.%: Si 3% to 15%, Mg 0.05% to 0.5%, one or more elements selected from the group consisting 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.

L'invention concerne un procédé de brasage sous atmosphère contrôlée qui comprend le brasage d'un alliage d'aluminium sans fondant dans une atmosphère contrôlée en utilisant une feuille de brasage constituée d'une âme d'alliage d'aluminium sur au moins un côté de laquelle une couche d'alliage de charge est plaquée, la couche de plaquage de charge présentant une surface intérieure et une surface extérieure, la surface intérieure étant tournée vers l'âme et la surface extérieure ne présentant aucune autre couche à base métallique, l'alliage de charge ayant une composition exempte de Na, exempte de Li, exempte de K et exempte de Ca et comprenant en % en poids : Si 3 % à 15 %, Mg 0,05 % à 0,5 %, un ou plusieurs éléments sélectionnés dans l'ensemble constitué de : (Bi 0,03 % à 0,2 %, Pb 0,03 % à 0,2 %, Sb 0,03 % à 0,2%, la somme de ces éléments étant de 0,2 % ou moins), Fe 0 à 0,6 %, Mn 0 à 1,5 %, le solde étant de l'aluminium et des impuretés inévitables.

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