Title: Effect of friction stir welding parameters on mechanical and micro structural behaviour of AA7075-T651 and AA6061 dissimilar alloy joint

Authors: K.P. Yuvaraj; P. Ashoka Varthanan; C. Rajendran

Addresses: Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore, India ' Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore, India ' Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore, India

Abstract: This article reports the effect of FSW tool parameters on tensile properties of the friction stir welded AA7075-T651 and AA 6061 butt joint. Aluminium is a widely used material in many engineering applications ranging from packaging material (cans, foil) to transportation (automobiles, aircraft, trucks). Nowadays titanium and composites are growing in use, most of commercial civil aircraft airframes are made from aluminium alloys. Without aluminium, civil and aviation would not be economically viable. In this work, dissimilar aluminium alloys such as AA7075-T651 alloy and AA 6061 alloy of 6mm thickness plate has been friction stir butt welded incorporating FSW tool parameters such as tool tilt, tool offset and pin diameter with central composite design (CCD) by using response surface methodology. It consists of three factors and five levels having 20 experimental runs. From this research, it is found that the joint fabricated with 6mm pin diameter, 0.9 mm tool offset and 3 degree tilt angle exhibited the acceptable tensile strength of 267 N/mm² compared to other joints. SEM analysis on the tensile fractured surface along with dimples clearly reveals the failure due to ductile behaviour.

Keywords: friction stir welding; pin diameter; tool offset; tool tilt angle; response surface methodology; ultimate tensile strength.

DOI: 10.1504/IJCMSSE.2018.092553

International Journal of Computational Materials Science and Surface Engineering, 2018 Vol.7 No.2, pp.130 - 149

Received: 22 Nov 2017
Accepted: 16 Jan 2018
Published online: 24 Jun 2018 *

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