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Microstructure,tensile and impact toughness properties and fracture location of friction stir welded AISI 1018 mild steel were revealed.The AISI 1018 mild steel plates with thickness of 5 mm were friction stir welded by tungsten based alloy tool with tool rotational speed of 1000 r/min and welding speed of 50 mm/min.Tensile strength of stir zone is higher (8%) compared to that of the base metal.This may be due to the formation of finer grains in the weld nugget region under the stirring action of the rotating tool.The ductility and impact toughness of the joints are decreased compared to those of the base metal owing to the inclusion of tungsten particles in the weld region.

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