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...International journal of recent technology and engineering ijrte issn online volume issue may effect tool rotational speeds on friction stir welded aa t aluminium alloy joints sameer md aruri devaraju saikumar gadakary srinu g abstract in the current work an attempt has been made to below weld line advantages fsw over other investigate speed microstructural fusion welding are high quality can be achieved mechanical properties absence solidification cracking porosity gas entrapment four different such as oxidation no requirement shielding defects rpm were used produce while several studies have alloys keeping process parameters constant using materials elongovan et al conducted fabricate samples was tungsten carbide with straight cylindrical pin profile examined optical scanning electron microscope pins they found that produced joint showed equiaxed grain carbon steel daniolos structure m average size studied joining dissimilar characteristics tensile strength impact grades concluded mi...