Experimental Fatigue Life Estimation of AA5083 Aluminium Alloys Welded by Two Welding Processes-Gas Metal Arc(GMA) Welding and Friction Stir Welding (FSW)
AA5083 aluminium alloys are widely used in automotive structure and naval structure due to its excellent corrosion resistance and weldibility. All such applications require joining of aluminium alloys in most effective and reliable method to withstand the fatigue failure. The main objective of the present work focuses on the investigation of mechanical properties (tensile strength, percentage of elongation, weld hardness and fatigue life) of AA5083 joint that are fabricated by two most popular welding processes-Friction Stir Welding (FSW) and Gas Metal Arc (GMA) welding. The commercial plates of AA5083 aluminium alloys were used in the study. The tensile properties and weld hardness were evaluated as per ASTMB-557M and ASTM E466 standards. Fatigue test was performed at stress ratio 0.1 with 20Hz frequency. Both welding processes lead to decrease of the material mechanical properties of the joint compared to parent metal. The FSW welding was found more effective to achieve better tensile properties and fatigue properties than GMA welding. Higher fatigue scatter was obtained in GMA welded specimens.
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