A fusion welding process to join aluminium and titanium

Details A fusion welding process to join aluminium and titanium A fusion welding process to join aluminium and titanium

B - Operations, Transporting

23

K

B23K 9/173 (2006.01) B23K 9/23 (2006.01) B23K 33/00 (2006.01)

Patent

CA 2730028

The invention concerns a process for joining a first member (1) comprising an aluminium alloy to a second member (2) comprising a titanium alloy and having at least one edge with a thickness e, comprising the steps of (i) chamfering said edge of said second member into a tapered truncated shape having on a first side a first tapering angle .alpha.1, on a second side a second tapering angle .alpha.2 and a minimum thickness t, wherein .alpha.1 and .alpha.2 are greater than or equal to zero, the sum of .alpha.1 and .alpha.2 is between 10° and 50° and t is between 0.05 e and 0.3 e, (ii) placing said first member and said chamfered edge of said second member (21) in an abutting relationship defining a geometry to be weld-brazed (3), (iii) heating the surface areas of said members adjacent the abutment to a temperature above the melting temperature of said aluminium alloy and below the melting temperature of said titanium alloy, in the presence of an inert gas (5) and of a filler metal (4) to obtain a weld-brazed joint. The process of the invention is particularly useful for obtaining high strength weld- brazed joints between aluminium and titanium with a high process output.

Linvention concerne un procédé dassemblage dun premier élément (1) comprenant un alliage d'aluminium et d'un second élément (2) comprenant un alliage de titane et comprenant au moins un bord présentant une épaisseur e, comprenant les étapes de (i) chanfreinage dudit bord dudit second élément en une forme tronquée conique comprenant sur un premier côté un premier angle conique a1, sur un second côté un second angle conique a2 et une épaisseur minimale t, a1 et a2 étant supérieurs ou égaux à zéro, la somme de a1 et a2 étant comprise entre 10° et 50° et t étant compris entre 0,05 e et 0,3 e, (ii) placement dudit premier élément et dudit bord chanfreiné dudit second élément (21) dans une relation de butée définissant une géométrie devant être soudée/brasée (3), (iii) chauffage des zones de surface desdits éléments adjacents à la butée à une température supérieure à la température de fusion dudit alliage daluminium et inférieure à la température de fusion dudit alliage de titane, en présence dun gaz inerte (5) et dun matériau de remplissage (4) pour obtenir un joint soudé/brasé. Le procédé selon linvention est particulièrement utile pour lobtention de joints soudés/brasés à haute résistance entre l'aluminium et le titane avec un rendement élevé.

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