Method for welding strips of aluminium alloy

Details Method for welding strips of aluminium alloy Method for welding strips of aluminium alloy

C - Chemistry, Metallurgy

22

C

C22C 21/02 (2006.01) B23K 35/00 (2006.01) B23K 35/02 (2006.01) C22C 21/04 (2006.01)

Patent

CA 2547801

The invention relates to a method for assembling sheets of aluminium alloy, comprising a welding without flux, in a controlled atmosphere, at a temperature of 580 to 620 ·C, a rapid cooling and, optionally, reheating to a temperature of 80 to 250 ·C, in which at least one of the sheets has a core alloy comprising (wt. %), Si 0.3 1.0, Fe < 1.0, Cu 0.3 1.0, Mn 0.3 2.0, Mg 0.3 3.0, Zn < 6.0, Ti < 0.1, Zr < 0.3, Cr < 0.3, Ni < 2.0, Co < 2.0, Bi < 0.5, Y < 0.5, other elements < 0.05 each, to a total of 0.15, the remainder being aluminium and covered on at least one face with a welding aluminium alloy, comprising 4 to 15 % silicon and 0.01 to 0.5 % of at least one of the elements Ag, Be, Bi, Ce, La, Pb, Pd, Sb, Y or a mixed metal. The method is particularly suitable for the non-flux welding of heat exchangers.

L'invention a pour objet un procédé d~assemblage de tôles en alliage d'aluminium comportant un brasage sans flux sous atmosphère contrôlée à une température comprise entre 580 et 620~C, un refroidissement rapide et éventuellement un revenu à une température comprise entre 80 et 250~C, et dans lequel l'une au moins des tôles est constituée d'un alliage d'âme de composition (% en poids) Si : 0,3 - 1,0 Fe < 1,0 Cu : 0,3 - 1,0 Mn : 0,3 - 2,0 Mg : 0,3 - 3,0 Zn < 6,0 Ti < 0,1 Zr < 0,3 Cr < 0,3 Ni < 2,0 Co < 2,0 Bi < 0,5 Y < 0,5 autres éléments < 0,05 chacun et 0,15 au total, reste aluminium, et revêtue sur au moins une face d'un alliage d'aluminium de brasage contenant de 4 à 15% de silicium et de 0,01 à 0,5% de l'un au moins des éléments Ag, Be, Bi, Ce, La, Pb, Pd, Sb, Y ou de mischmetal. Le procédé est destiné notamment au brasage sans flux des échangeurs thermiques.

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