Kamil Resan, Kadhim. 2013. “Predict of Residual Stress Behavior in Aluminum Friction Stir Welding by Leeb Hardness Method”. Journal of Engineering and Sustainable Development 17 (1): 233-41. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1105.