1. Midling O T, Morley E J, Sandvik A, Friction Stir Welding, US Patent no. USOO5813592A (1998).
2. Sengupta K, Mondal A K, Bose D, Singh D K, IEEE 1st International Conference for Convergence in Engineering (ICCE), p 32 (2020).
3. Palm F, Laser supported friction stir welding method, US Patent no. 6 793 118 (2004).
4. Park K, Kim B, Ni J, Proceedings of the ASME 2007 International Mechanical Engineering Congress and Exposition. Volume 3: Design and Manufacturing. Seattle, Washington, USA. November 11–15, 2007. (2007) p 731. ASME.
5. Ferrando W A, Electrically assisted friction stir welding, US Patent no. US8164021B1 (2008).