Table of Contents
ISRN Mechanical Engineering
Volume 2014, Article ID 681910, 15 pages
http://dx.doi.org/10.1155/2014/681910
Research Article

Springback of Friction Stir Welded Sheets Made of Aluminium Grades during V-Bending: An Experimental Study

Department of Mechanical Engineering, IIT Guwahati, Guwahati, Assam 781039, India

Received 12 November 2013; Accepted 13 February 2014; Published 18 March 2014

Academic Editors: A. Combescure, X. Yang, and G. Zhao

Copyright © 2014 B. Durga Rao and R. Ganesh Narayanan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The main aim of the present work is to study the effect of shoulder diameter, rotational speed, and welding speed on the springback performance of friction stir welded sheets. The friction stir welded sheets are made by welding 6061T6 to 5052H32, and 6061T6 to 6061T6. The springback has been evaluated after V-bending of welded sheets, involving pure bending. The relation between springback and weld zone properties like yield strength, Young’s modulus, yield strength to Young’s modulus ratio, and strain hardening exponent is identified. It is found that, with increase in shoulder diameter, rotational speed, and welding speed, the springback of friction stir welded sheets has reduced, and is independent of the material combinations. The relation between springback and weld properties change coincides with existing knowledge about springback. The friction stir welded sheets show better springback performance as compared to 6061T6 base material, but inferior to 5052H32 base material. By reducing the punch nose radius, the springback of friction stir welded sheets can be minimized. It is also concluded that, by proper tailoring of Al grades, and by alteration of weld zone properties through friction stir welding, the springback of friction stir welded sheets can be reduced considerably.