Materials Today: Proceedings 2 (2015) 3491 – 3500 Available online at www.sciencedirect.com ScienceDirect 2214-7853 © 2015 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the conference committee members of the 4th International conference on Materials Processing and Characterization. doi:10.1016/j.matpr.2015.07.325 4th International Conference on Materials Processing and Characterization A Study of Mechanical and Micro Structural Properties of Friction Stir Welded Aluminium Alloy Chandrashekar.A a *, H.N.Reddappa a and B.S.Ajaykumar b a Asst. Professor, Dept. of Mechanical Engg. Bangalore Institute of Technology, Bangalore-560 004, India b Professor, Dept. of Mechanical Engg. Bangalore Institute of Technology, Bangalore-560 004, India Abstract Aluminium alloys have a wide range of application in many industries like aerospace, defence, marine etc. Friction Stir Welding (FSW) can produce low cost and high quality joints of aluminium alloys because it does not need consumable filler materials and can eliminate some welding defects such as crack and porosity. The most important contributing factors for mechanical properties are Tool rotational speed and Tool feed followed by Shoulder diameter and Pin depth. In this paper a little concentration is paid to study the effect of rotational speed and feed rate on properties of FSW weldments. Aluminium plates of Standard thickness (6 mm) were butt welded on single side by friction stir welding (FSW) process under various traversing speeds and rotational speeds. The effects on mechanical properties like hardness and tensile strength of the welded region were studied. Reduction of hardness by an amount of 7.8% at higher welding speed might have increased the tensile strength by an amount of 45%. © 2014 The Authors. Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the conference committee members of the 4th International conference on Materials Processing and Characterization Keywords: AA5083 alloy, Friction stir welding, Tool pin geometry, Micro hardness, Tensile Testing. © 2015 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the conference committee members of the 4th International conference on Materials Processing and Characterization.