Experimental Fatigue Life Estimation of AA5083 Aluminium Alloys Welded by Two Welding Processes- Gas Metal Arc (GMA) Welding and Friction Stir Welding (FSW)
Keywords:
Friction Stir Welding (FSW), Gas Metal Arc (GMA) Welding, Fatigue Life, Aluminium AlloysAbstract
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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