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Traditional tools in friction stir welding (FSW) of thermoplastics fail to achieve high quality and strong welds. In this paper, a new heat-assisted stationary shoulder FSW tool design, which provides constant tool temperature during the process using a controllable hot air gun, is introduced. Effect of the process parameters, including tool temperature, rotational speed, and traverse speed, on the...
A new homemade apparatus, i.e. vibration assisted extrusion equipment, is employed to extrude polypropylene. Vibration assisted extrusion is based on the application of a specific macroscopic shear vibration field. Reduction of apparent melt viscosity as a function of vibration frequency is measured at different screw speeds and die temperatures. The effect of the process is investigated...
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