The continuous drive rotary friction welding was conducted on AA6061-T6 aluminum alloy rods under different rotation speeds. The effect of rotation speed on friction behavior was investigated via analyzing the friction torque, temperature, microstructure and axial shortening. The results show that the curves of friction time and friction work as a function of rotation speed present like “V-shape” with the minimum values locating at around 900 rpm. Besides, the ratio of friction work in the first stage to that in the whole process increases and then decreases after reaching the maximum value at 900 rpm. As the rotation speed increases, the heat pattern gradually changes from the “scissor-shape” into “double-ellipse shape” that is acquired at 900 rpm and eventually into the “disc-shape.” Additionally, the axial shortening rate at the steady stage initially reaches a high constant value and then drops to another constant value that is nearly half of the high value when the rotation speed is not less than 1500 rpm. The high axial shortening rate can be ascribed to the process of filling the unbonded area remained at the interface after the first friction stage.
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This work is supported by the National Natural Science Foundation of China (Grand No: 51475376, 51575451).
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