Alheta, Saleh, Sayed Zayan, Tamer Mahmoud, and Attia Gomaa. “Optimization of Friction Stir Spot Welding Process Parameters for AA6061-T4 Aluminium Alloy Plates”. American Scientific Research Journal for Engineering, Technology, and Sciences 20, no. 1 (June 21, 2016): 244–253. Accessed April 28, 2024. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1779.