Hamzah, M. N., Bakhy, S. H., & Fliayyh, M. A. (2017). Effect of Pin Shape and Rotational Speed on the Mechanical Behaviour and Microstructures of Friction Stir Spot Welding of Aa6061 Aluminum Alloy. Al-Nahrain Journal for Engineering Sciences, 20(1), 129-139. https://nahje.com/index.php/main/article/view/79