Abstract
Al-Zn-Mg alloy is a medium strength and non-weldable aluminium alloy. This alloy has high ballistic strength which makes it the primary choice material for military vehicles. Low energy solid state welding process such as friction stir welding (FSW) is the suitable welding technique for such non-weldable alloys. As the welded structure is the result of effects of thermal cycles and multi-stirring action experienced by parent material during welding, therefore, this study is carried out to investigate the thermal effect of multi-pass FSW process on mechanical properties and microstructure of Al-Zn-Mg alloy welded joint. Significant changes in the microstructure of nugget zone, thermo-mechanical affected zone (TMAZ) and heat affected zone (HAZ) were observed which further had affected the overall mechanical performance of the welded structure.
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