2004 Volume 22 Issue 2 Pages 309-314
The possibility of a welding between ADC12 and SS400 by means of friction stirring was fundamentally clarified. The primary process parameters, such as a rotating speed, rotating direction of rod and offset of pin periphery from materials interface were optimized, respectively. The welding was performed only in the clockwise rotating direction while that was not in the counter clockwise. Too large figures of the rotating speed failed in the welding due to the broken of rod itself. Optimum condition in the offset of pin periphery from the interface was given as it is on the interface or inside of the hard material. Consequently, the welded joints showed higher tensile strength than that of the base aluminum material when the welding was pursued under the moderate conditions. Intermetallic compound phase was not detected obviously at the interface region of the welded joint. Welding mechanism between aluminum alloy and steel by means of friction stirring with clockwise rotating direction was proposed.