Soudabilité d'alliages Al - Li - Cu - Mg¹

Weldability of Al-Li-Cu-Mg Alloys

GIAT/ATS, Centre de Recherches des Matériaux, Tarbes

Abstract

The weldability of two aluminium-lithium alloys: CP271 (8090) and CP276, welded by gas tungsten arc (GTA) process, has been investigated. First results show that :

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  the welding of T851-treated alloys leads to important weld porosity, which is related to a 0.2 mm surface layer formed during solution heat treatment;

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  tensile strength joint efficencies (JE) of 50 % were obtained without post welding heat treatment or after artificial aging. By repeating the entire heat treatment of the alloy, JE could be increased up to 80 % ;

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  stress corrosion behaviour is sharply influenced by the post-welding heat treatment.