Abstract
5052 aluminum alloy thin plate with 0.6 mm in thickness was friction welded by friction heat between specimen and tool. The rotational tools with 6 mm, 10 mm and 15 mm in diameter were used. Both microstructure and tensile shear strength of friction spot welded joint were investigated. The appearance of friction spot welded joint showed similar to a resistance spot welding. Both nugget and deformation of weld interface were not observed in the friction spot welded joints. The tensile shear load of welded joint using tool of 6 mm increased with increasing of friction pressure independent of rotational speed. In case of using 10 mm tool, effect of rotational speed on the tensile shear load became smaller at friction pressure of 30 MPa, but tensile shear load decreased with increasing of rotational speed at friction pressure 40 MPa. The highest tensile shear load of welded joint using tool of 15 mm was obtained at rotational speed of 10.8 s^<-1>. The tensile tested specimens which showed high tensile shear strength were shown like a plug type rupture.
