1. W.M.N. Thomas, E.D. Nicholas, C. Needham, M.G. Murch, P. Templesmith, and C.J. Dawes, Friction Stir Butt Welding, Int. Patent Appl. PCT/GB92/02203 and GB Patent Appl. 9125978.8, 1991, and US Patent Appl. 5460317, 1995.
2. R.S. Mishra and Z.Y. Ma, Friction stir welding and processing, Mater. Sci. Eng. R, (50)2005, No. 1–2, p. 1.
3. G. Çam and G. İpekoğlu, Recent developments in joining of aluminium alloys, Int. J. Adv. Manuf. Technol., 91(2017), No. 5–8, p. 1851.
4. G. Çam, Friction stir welded structural materials: beyond Al–alloys, Int. Mater. Rev., 56(2011), No. 1, p. 1.
5. G. Çam, G. İpekoğlu, T. Küçükömeroğlu, and S.M. Aktarer, Applicability of friction stir welding to steels, J. Achv. Mater. Manuf. Eng., 80(2017), No. 2, p. 65.