A Study on Welding Parameters of Aluminum 5086 Using Friction Stir Welding

P.S. Gowthaman, Dr.B.A. Saravanan and N. Sellappan

Friction stir welding, a solid state joining technique, is widely being used for joining Al alloys for aerospace, marine, automotive and many other applications of commercial importance. The Aluminium 5086 is used in marine, Aerospace, Automobile applications. In this work, an attempt has been made on Friction stir welding (FSW) parameters of Al5086. In FSW, forging force was found to be dependent upon the shoulder diameter and rotational speed whereas the longitudinal or welding force on welding speed and pin diameter. Tensile strength of welds was significantly affected by welding speed and shoulder pin diameter. The welding speed directly affects the percentage of elongation. Micro-structure studies shows a fine grains occurs in the weld nugget zone (WNZ) and Thermo mechanically affected zone (TMAZ). It was found to be combined and influences of frictional heat and deformation. A maximum Joining efficiency was obtained for welds with good elongation. Microstructure studies shows a Coarsening and dissolving of precipitates in nugget zone. Furthermore the Void defect is formed in the joint whereas the weld speed or rotational speed is quite high. This work addresses the influence of welding parameters in Al alloy.

Volume 11 | Issue 6

Pages: 198-205