Effect of friction stir welding parameters on tool geometry and metallurgical properties of AA 6082-T6 weldments at different weld zones

The main agenda of the present research work is to evaluate the influence of FSW parameters and tool geometry on metallurgical properties during FSW of AA 6082-T6 aluminium alloy. Friction stir welding was performed on AA 6082-T6 using four different geometrical tool pin profiles namely AsymmetricalSkew, Triangular concave threaded tool, Three flat threaded tool (TFT) and Tri-Flute concave threaded tool at three rotational speed's (1000 rpm, 1200 rpm, 1400 rpm) and single traverse speed 25 mm/min. Microstructure of various regions on the weldments like Nugget Zone (NZ), Advancing side thermomechanically affected zone (AS-TMAZ),Advancing side heat affected zone (AS-HAZ), Advancing side boundary zone (AS-BZ), Retreating side thermo-mechanically affected zone (RS-TMAZ), Retreating side heat affected zone (RS-HAZ), Retreating side boundary zone (RS-BZ) were analysed using Labex FE PRO 900 metallurgical microscope. Defects like voids, cavities, zigzag lines and chunks were observed on most of the weldments. Occurrence of martensite and defects like voids, cavities, zigzag lines and chunks were observed at 1400 rpm near Nugget Zone (NZ), Advancing side thermo-mechanically affected zone (ASTMAZ), Advancing side heat affected zone (AS-HAZ), Retreating side thermo-mechanically affected zone (RS-TMAZ), Retreating side heat affected zone (RS-HAZ). (c) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Advances in Materials Research - 2019.