HEAT TREATMENT AND WELDING EFFECTS ON MECHANICAL PROPERTIES AND MICROSTRUCTURE EVOLUTION OF 2024 AND7075 Aluminum ALLOYS

Type : Publication
Auteur(s) :  M. Hakem, M. KHATIR, RR. OTMANI, T.FAHSSI, N. DEBBACHE, D. ALLOU
Année :  2007
Domaine : Sciences des matériaux
Revue : Welding in the world
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  heat treatment, Aluminium alloys welding, hardness, Precipitation, tensile strength, yield strength, Microstructures

Résumé : 

Aluminum alloys are sensitive to hot cracking during the welding operation, both liquidation cracking in the heat affected zone (HAZ) and solidification cracking in the weld can occur. The GTA Welding results of aluminum alloys 2024 T3 and 7075 T6 for 2 mm plate thickness with different parameters of welding are presented in this paper. Before welding, different alloys were heat treated at different temperature to follow the evolution of microstructure and mechanical properties. After welding, the strength of the materials in heat affected zone (HAZ) is reduced. This reduction on properties is due to the different phenomenon that occurs during welding