8[1]Dwes C J,Thomas W M.Friction stir process welds aluminum alloys.Welding Journal,1996,76 (3):41 ~ 45
9[2]Thomas W M,Nicholas E D.Friction stir welding for the transportation industries.Materials and Design,1997; 18 (4/6):269 ~ 273
10[6]Ke Liming,Xing Li,Indacochea J E.Material flow patterns and cavity model in friction stir welding of Al-alloy,Metal.Mater.Trans.B.,2004 ;135(2):153 ~ 160