Abstract
Abstract Friction can be utilized for joining two metals. Friction Stir Welding (FSW) is the outcome of such application. It overcomes many issues related to traditional methods. In this paper, presented the effect of parameters on micro hardness, micro structures on similar and dissimilar joints of aluminium alloy AA6061-T6 and magnesium alloy AE42 were studied. The three zones of a welded joints were analysed for their optical microstructure and micro hardness distribution. Using the experimental setup the main and interaction effects on various parameters which influence mechanical properties of the joints were evaluated. The parameters were optimized for high ultimate tensile strength of the joints of aluminium alloy AA6061-T6 and magnesium alloy AE42, and they are validated. The rotation speeds considered as 800 & 1200 rpm is performed by friction stir welding, axial force of 40 KN and welding speed (40-150 m / sec) respectively. Microstructure analysis of the base metal and welds were carried out by optical microscopy, XRD, SEM were studied, and also Tensile strength of dissimilar metals welded joints was studied. The micro hardness profiles were in good agreement with the corresponding microstructures.
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