MOHAMMEDTAHER M. SAEED MULAPEER, A. S. A. S. R. J. R. “A Review Paper On Bobbin Tool Friction Stir Welding (Btfsw) And Metal Inert Gas Welding Of Various Materials”. Design Engineering, Sept. 2021, pp. 6597-06, http://www.thedesignengineering.com/index.php/DE/article/view/4141.