EFFECT OF TOOL ROTATION SPEED ON TENSILE STRENGTH OF FRICTION STIR WELDED AA2024-T6 AND AA7075-T6 DISSIMILAR ALUMINUM JOINTS
Keywords:
Dissimilar aluminum alloy, Welding, MicrostructureAbstract
Solid state joining processes are ideally suited for joining dissimilar aluminum alloys since these processes does not involve the defects due to solidification. Among these processes friction stir welding was efficient for joining dissimilar joints. The joint efficiency greatly depends on the process parameters like tool rotational speed, welding speed, axial load and geometry of the tool. In this study the effect of tool rotational speed on tensile strength of AA2024-T6 and AA7075-T6 was discussed in detail. Five joints were made for different tool rotational speed. The other parameters included in this study are welding speed, axial load and the shoulder diameter to pin diameter ratio. Tensile properties of the joints have been evaluated. Macro and micro structural analysis was done by using optical microscopy. From this investigation it was found that at the tool rotational speed of 1200 RPM the joints exhibits the maximum tensile strength when compared to other joints.
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