EFFECT OF TOOL SHAPE GEOMETRY AND ROTATION SPEED IN FRICTION STIR WELDING OF 2024-T3

Abstract

The aim of this papers is studied effect of tool pin geometry and welding parameters (rotation speed and welding speed) on the mechanical properties and microstructure of 2024-T3 welded by FSW. Three different tool pin geometry (tapered cylindrical threaded pin TCT, straight cylindrical threaded pin SCT and triangular threaded pin TT) with variable rotation speed (710, 900 and 1120) RPM and constant welding speed (26) mm/min. results showed quality of the weld and the mechanical properties (ultimate tensile strength, yield strength and elongation) effect with different pin geometry and welding parameters. TCT tools gives maximum tensile strength as compared with SCT and TT equals to (410MPa) and joint efficiency (85.25%) of base metals at rotation speed (900RPM) and welding speed (26mm/min). The microstructure of the weld nugget is fine and equaixed in all the tools compared with base metal and grain size increased with increased rotation speed because increase heat input.