Abstract
Growing importance of Friction Stir Welding (FSW) on Aluminum alloys provides promising ecological weld methods in aerospace and marine applications. In this paper the effect of FSW rotational speeds on mechanical properties and microstructure of Aluminium Alloy 5083 weldments are studied. The 4mm thick plates of AA5083 are friction stir welded using conical profile tool by varying the tool rotational speeds of 900rpm, 1120rpm, 1400rpm, 1800 rpm and at constant welding speed of 40mm/min. Microstructural study and mechanical testing methods on sample weldments showed that a better weld of good tensile strength and fine grain microstructure were obtained at a tool rotational speed of 1120 rpm.
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