Mechanical Behaviour of MAG Pulsed Welded Joints from 6082 T6 Aluminium Alloy

摘要

One of the difficulties encountered by aluminum alloys fusion welding consist in reducing of the mechanical resistance characteristics of the weld seam and of the heat-affected zone (HAZ) compared to those of the base metal. The paper investigates the microstructural and mechanical properties changes of pulsed MAG welded joints made from the 6082-T6 alloy delivered in the form of 5 mm thick sheets. The dissolving phenomena of the hardenable phases in the sub-zones near the molten metal bath and the overaging of alloy in HAZ sub-zones at temperatures lower than those of precipitates redissolving, justifies the decrease of the mechanical resistance in the HAZ zone.