Majid Farhang - School of Mechanical Engineering, College of Engineering, University of Tehran, Iran.
Mohammadreza Farahani - School of Mechanical Engineering, College of Engineering, University of Tehran, Iran.
Moein Enami - School of Mechanical Engineering, College of Engineering, University of Tehran, Iran.

In this study, effects of process parameters of Friction Stir Spot Welding were investigated on Al۲۰۲۴T۳ which has poor weldability. Several spot welds were performed by the FSSW process on the ۲mm aluminium sheets. The effects of main process parameters such as tool Rotational Speed (RS), Normal Plunge Depth (NPD), and Dwell Time (DT) on the joint strength were investigated. By increasing the tool rotational speed, the joint strength increased, consequently. The mean failure load improved ۵۲% when the tool rotational speed increased from ۸۰۰ rpm to ۱۱۲۰ rpm, whereas increasing the rotational speed from ۱۱۲۰ to ۱۶۰۰ did not have significant effect on the failure load. The results showed, increasing the normal plunge depth from ۱.۵ to ۱.۷۵ millimetre led to an increase in the failure load of spot welds by about ۱.۶۲ times. Also, the ۳ seconds dwell time showed higher failure load compared to ۲ and ۵ seconds dwell time.

Aluminium ۲۰۲۴T۳, Dwell time, Failure load, Friction stir spot welding, Normal plunge depth, Rotational Speed