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METALLURGICAL AND MECHANICAL CHARACTERIZATION OF ALUMINUM ALLOY 6061 T6 WELD JOINT

Auteurs : HAKEM MAAMAR, LEBAILI SOLTANE, MIROUD Djamel
Année : 2013
Domaine : Sciences des matériaux
Type : Communication
Conférence: EUROMAT 2013
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : Welding aluminum alloys, Metallurgical and Mechanical evolution, Precipitation

Résumé :

An investigation was made for welding an Aluminum Alloy 6061-T6 by gas tungsten arc welding with ER4043 filler metal. The material used is an extruded pipe of 168.3 mm (6 inch) diameter and 7.11 mm thickness. A metallurgical analysis was made through out weld joint, heat affected zone and base metal followed by micro hardness test, tensile test and fracture analysis. Microstructural changes in the weld metal are between dendrite structure and a granular structure. The heat affected zone is divided into several areas according to the distance from the deposited metal to base metal. There is a coarse structure, recrystallized and fine structure. The fracture analysis revealed a surface usually consisted of elongated dimples, a pattern indicating failure via ductile fracture mechanisms and fragile face that can be the precipitates of the second phase.