Heat transfer modeling of dissimilar FSW of Al 6061/AZ31 using experimentally measured thermo-physical properties

Abstract

A heat transfer numerical model is developed for friction stir welding of dissimilar materials Al 6061 and AZ31 alloy. Thermo-physical properties were experimentally determined for the stir zone and compared with the base alloys. Experimentally determined thermo-physical properties of the stir zone are not strictly the average values of the base alloys but exhibit a complex relationship with the microstructural features and the intermixing of Al and Mg in the weld region. The numerical model is employed to predict the temperature distribution on the advancing and retreating side. A good agreement between computed and experimentally measured results was obtained at 24-mm, 20-mm, and 16-mm tool shoulder diameter. The proposed model can be used to predict the thermal cycle, peak temperature, and thermo-mechanically affected zone for welding of dissimilar materials on friction stir welding.

Amit Kumar Singh

Post-doctoral Fellow, IIT Bombay

Amit had completed his M. Tech. in Materials Science and Engineering at IIT Gandhinagar 2016 before joining the doctoral programme at IIT Gandhinagar. His research is focused on understanding the physical phenomena and the science behind additive manufacturing processes. Amit is interested in determining heat transfer and simulating fluid flow during laser assisted additive manufacturing processes.