http://www.iaeme.com/IJMET/index.asp 173 editor@iaeme.com International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 12, December 2017, pp. 173–183, Article ID: IJMET_08_12_018 Available online at http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=8&IType=12 ISSN Print: 0976-6340 and ISSN Online: 0976-6359 © IAEME Publication Scopus Indexed DETERMINATION OF MECHANICAL PROPERTIES OF FRICTION STIR WELDED JOINT FOR ALUMINIUM ALLOY 6351 (HE-30) B.Praveen Kumar, N.Samba Siva Rao and M.Mohith Asst. Prof, Talla Padmavathi College of Engineering P.Srikanth Professor, KITS Warangal ABSTRACT Friction stir welding is a solid state welding process this process uses non- consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, axial force etc., and the tool pin profile plays a major role in deciding the weld quality. The main objective of thesis is investigation of mechanical properties of friction stir welded aluminium alloy 6351 (HE30). Analysis of effect of tool pin profile on mechanical properties of aluminium alloy. Heat treatment improves tensile strength, ductility, hardness. Tapered Cylindrical tool pin profile gives higher tensile strength. Square tool pin profile gives higher hardness. Triangular tool pin profile gives higher percentage of elongation. Keywords: Friction Stir Welded, Mechanical Properties, Aluminium Alloy 6351 Cite this Article: B.Praveen Kumar, N.Samba Siva Rao, M.Mohith and P.Srikanth, Determination of Mechanical Properties of Friction Stir Welded Joint for Aluminium Alloy 6351 (He-30), International Journal of Mechanical Engineering and Technology 8(12), 2017, pp. 173–183. http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=8&IType=12 1. INTRODUCTION Friction Stir welding (FSW) is a novel welding technique invented by the welding Institute (TWI) in 1991 (Cary H.B., 1979) [1] FSW is actually a solid State joining process that is a combination of extruding and forging and is not a true welding process. FSW is a derivative of conventional friction welding. The FSW is a derivative of conventional friction welding. The FSW process involves the translation of a rotating cylindrical tool along the interface between two plates. The weld is formed by the deformation of the material at temperatures below the melting temperature. FSW does not create a Heat effected Zone nor does it use welding consumables. Since traditional heating methods are not employed. The properties of the metal in the joined area are higher than those from any other known welding process and distortion is virtually eliminated (Weisheit A at all, 1998, Juttner, 1998) [2].