Angboonta, Prajak, Sirichai Torsakul, and Paisan Thongsong. “A Study of the Mechanical Properties of the Hardening Processes on the AISI 420 Stainless Steel by Friction Welding for Shaft Welding Industries”. Frontiers in Engineering Innovation Research 18, no. 2 (December 24, 2020): 87–97. accessed January 22, 2025. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/243669.