Method for assembling parts made of an aluminum alloy by...

B - Operations – Transporting – 23 – K

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Details

B23K 20/12 (2006.01) B23K 20/24 (2006.01) B23K 31/00 (2006.01) C21D 9/50 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2760015

The invention relates to a method for assembling parts (14a, 14b) made of an aluminum alloy, comprising: (I) providing at least one first part (14a) made of an aluminum alloy and which has been put in a solution, tempered, optionally hammer-hardened, and naturally aged at ambient temperature or previously tempered, and at least one second part (14b) made of aluminum alloy; (II) welding said parts (14a, 14b) in order to obtain a welded assembly having a welded area (16, 19, 18, 21); (III) carrying out a cold deformation of 0.3 to 5% of the entire welded area (16, 18, 19, 21); (IV) carrying out a post-welding tempering of the thus-deformed welded assembly in order to obtain a final metallurgical state. The welded assemblies obtained by the method of the invention have welded seams with improved properties, in particular in terms of mechanical strength, corrosion resistance, and the microstructure of the welded area.

L'invention concerne procédé d'assemblage de pièces en alliage d'aluminium (14a, 14b), dans lequel (i) on approvisionne au moins une première pièce en alliage d'aluminium (14a) dans un état mis en solution, trempé, optionnellement écroui, et vieilli naturellement à température ambiante ou ayant subi un pré-revenu, et au moins une seconde pièce (14b) en alliage d'aluminium, (ii) on soude les dites pièces (14a, 14b) pour obtenir un assemblage soudé présentant une zone soudée (16,19,18,21), (iii) on réalise une déformation à froid comprise entre 0,3 et 5 % de l'ensemble de ladite zone soudée (16,18,19,21), (iv) on réalise un revenu post-soudage de l'assemblage soudé ainsi déformé pour obtenir un état métallurgique final. Les assemblages soudés obtenus par le procédé selon l'invention présentent des joints soudés dont les propriétés sont améliorées notamment en termes de résistance mécanique, de résistance à la corrosion et de microstructure de la zone soudée.

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