FRICTION-STIR TOOL AND WELDING METHOD USING THIS, AND METHOD FOR REMOVING FINE GAP ON CAST SURFACE

摘要

PROBLEM TO BE SOLVED: To provide a friction-stir tool and welding method using it with which a good quality joined part can be surely formed without using the large diameter of a tool body and a stirring pin. SOLUTION: This friction stir tool 1 is provided with the tool body 3 containing the round-bottom surface 4 and the stirring pin 8 projected from the bottom surface 4 of this tool body 3 and having parallel axis and eccentric axis to the axis of the tool body 3. Further, this joining method is provided with a process for forming a butt surface 14 by butting aluminum alloy plates 11, 12 and a process for friction-stir the above alloy plates 11, 12 through the welding part W by shifting while rotating the above friction-stir tool 1 along this butt surface 14.