Abstract
In this investigation, an attempt has been made to join the polyvinyl chloride (PVC) sheet of 3mm thickness with a taper cylindrical pin tool. They are butt welded under different weld parameters by Friction Stir Welding. This study is focused on the effect of tool rotational speed on the force, torque and mechanical behaviour of friction stir welded polyvinyl chloride sheets. The welding parameters are the tool rotational speed; varied between 1500 and 1800 RPM and the traverse speed; varied between 0.3 and 0.7 (mm/sec) with a constant tilt angle of 1°. It is observed that the spindle torque is first increasing then decreasing with increasing tool rotational speed whereas in some cases the spindle torque is also found to decrease with increase in traverse speed. Z-force is found to reduce as the tool rotation speed increases. With a change in traverse speed inconsistent variation of Z-force is observed causing disturbed material flow and weld irregularities. Minimum micro-voids and blisters are observed in Scanning Electron Micrographs of the nugget zone of the specimen welded at 1600 RPM and 0.3 mm/sec traverse speed. The specimen with least micro-voids also exhibits highest ultimate tensile strength.
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