EFFECT OF PULSED WELDING PROCESS ON MICROSTRUCTURE, MECHANICAL PROPERTIES AND ELECTROCHEMICAL BEHAVIOUR OF6061-T6 ALUMINIUMTIG WELDED JOINT.

Auteurs :  M. Hakem, S. Lebaili, S. Mathieu, D. Miroud
Année : 2018
Domaine : Sciences des matériaux
Type : Communication
Conférence: 12ème International Conference on Physics of Advanced Materials (ICPAM-12)
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF : 
Mots clés : Aluminium Alloys; Pulsed TIG welding; Microstructure; Fractographs; Electrochemical behaviour.

Résumé : 

This work describes the effects of Pulsed Current Tungsten Inert Gas welding (PC-TIG) process on the microstructural evolution and mechanical properties of 6061 aluminium alloys. Microstructure analysis across the weld, micro hardness test, Scanning Electron Microscopy examination and fracture analysis are done to evaluate the performance of welding joint.PC-TIG welding produced a dendritic equiaxed structure in the moltenzone; it consists of α-Al grains and Al-Mg eutectic mixture.Micro hardnessmeasurements shows a drop of hardness in the heat-affected zone (HAZ). The corrosion behaviour shows that the molten zone is an anodic region while the base metal and heat-affected zone are the cathodic regions. The fracture surfaces shows fine populated dimples, which are the characteristic features of ductile mode of fracture.