Abstract
Abstract In this study, characteristics of TiAl alloy and SCM440 (Cr-Mo steel) have been investigated with thevarious joining condition by servo motor type friction welder. The experimental factors of friction welder used inthis study are spindle revolution, friction speed, and distance, upset speed and distance, respectively. Servomotor type friction welder could be controlled by the level of oil pressure, and it could be performed by positioncontrol dependence of electrical energy. Mechanical properties and morphology of welded interface were charac-terized by various joining condition. This aroused due to the bond strength dependence on friction heat and sizeof the heat affected zone. Therefore, it is necessary to have enough friction heat and decreased heat affectedzone for good friction welding between dissimilar metals. An optimum bond was obtained between TiAl alloy andSCM440 by controlling friction speed and distance. At the spindle revolution 4,000 rpm, friction speed 120 mm/min, friction distance 15 mm, the bond strength was found to be 312 MPa.(Received February 11, 2016; Revised February 17, 2016; Accepted February 25, 2016)Key words : TiAl alloy, SCM440, Servo-motor type friction welding, Joining factors
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