Abstract
Friction welding of dissimilar metals was performed to evaluate the formation of intermetallic compound during welding. In our research, A6061 aluminum alloy and S45C carbon steel were applied to investigate effect of friction welding parameters on the strength of welded joint. A continuous drive vertical friction welding machine was employed. Tensile test results revealed that the maximum tensile strength was achieved at extremely short friction time and high upset pressure, that was friction time 1 s and upset pressure about 250 MPa. The joint strength reached 92% of the tensile strength of A6061 base metal. Tensile strength of friction welding was increasing with increasing upset pressure under friction time 1 s. However, tensile properties were deteriorated with increasing friction time. Prolonged friction time to 3 s was given less joint strength 52% than that of 1 s. It was observed that the amount of intermetallic compound was increasing with increasing friction time at weld interface. Partly formed intermetallic compound on weld interface were recognized at friction time 1 s. However, intermetallic compound layer were severely developed with longer friction time at weld interface. Consequently it was concluded intermetallic compound layer deteriorated the tensile properties of weld joints.
