In the present paper an aluminum-magnesium alloy plate was butt-welded to a mild SS400-steel plate by friction stir welding. The rotating tool was made of heat-treated tool steel and has a shoulder of 15cm diameter with a pin of 2mm diameter and was 1.9 mm long. Welds were made with a clock-wisely rotating pin at rotation speeds of 100-1250 rpm. The pin transverse speed was 25 mm/min. The effects of the pin rotation speed, the position for the pin axis to be inserted on the tensile strength and the microstructure of the joint were investigated. The behavior of the oxide film on the faying surface of the steel during welding also was examined. The main results obtained are as follows: Butt-welding of an aluminum alloy plate to a steel plate was easily and successfully achieved by friction stir welding. The maximum tensile strength of the joint was about 86% of that of the aluminum alloy base metal. A small amount of intermetallic compounds was formed at the upper part of the steel/aluminum interface, while no intermetalic compounds were observed in the middle and bottom parts of the interface. The regions where the intermetallic compounds formed seemed to be fracture paths in the joint. Many fragments of the steel were scattered in the aluminum alloy matrix and the oxide film removed from the faying surface of the steel by the nibbing motion of a rotating pin was observed at the interface between the steel fragments and the aluminum alloy matrix.
Joining of aluminum alloy to steel by friction stir welding
Journal of Materials Processing Technology ; 178 , 1-3 ; 342-349
2006
8 Seiten, 14 Bilder, 8 Quellen
Article (Journal)
English
Friction stir welding of aluminum alloy to steel
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