EFFECT OF TOOL ROTATIONAL SPEED ON MICROSTRUCTURE AND MECHANICAL BEHAVIOR OF FRICTION STIR WELDED AA7075/WC METAL MATRIX COMPOSITES

In order to prevent the problems of fusion welding of aluminum alloys, the friction stir welding (FSW) is one of the better ways of the joining method to enrich the mechanical properties. Tool Rotational Speed is one of the important process parameter in friction stir welding machine which effects the characterization of FS weld. In the present examination, Aluminum with 6 wt% WC composites is prepared and welding is done by using friction stir welding (FSW) process. In this present work we are using four different Rotational Speeds are used i.e. 500, 700, 900, and 1100(RPM) to weld metal matrix composite joints. It is concluded that those weld joints welded by with the Rotational Speed of 1100rpm. It shows good mechanical properties compared to the other Rotational Speeds. And also from metallurgical examination finer grain structure identified in Nugget zone compared to TMAZ and HAZ.