An investigation on the quality of PVC joints welded by friction stir welding (FSW ) with different shape of pin was carried out. The results show that when the rotating speed of stir tool is 1660r/min and the welding speed is 25mm/min, the beads welded with upright taper pin are plump and joined well, the average tensile strength of which is 19.1MPa (the maximum is 20.3MPa), being 49.2% of that of parent material. The beads welded with cylindrical pin are also joined rather well plump and smooth, the average tensile strength of which is 17.6MPa, being 45.3% of that of parent material. The beads welded with inverted taper and cylindrical screw pin are only partially joined or disjoined. The optimum welding temperature range of PVC is 180-190℃. If the temperature beyond 200℃ the material will be burnt. If the temperature is under 170℃ the material will be joined partially or disjoined.
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