Debbarma, Subodh, Abhijit Sarkar, and Subhash Chandra Saha. 2012. “A Comparative Study on the Hardness Behaviour of Friction Stir Welding AA6063 Alloy”. Advanced Technologies and Materials 37 (2):153-60. https://jged.uns.ac.rs/index.php/atm/article/view/JTP.2012.37.2.5.