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Abstract
This paper aims to investigate the joining of polypropylene using friction stir welding (FSW). FSW parameters were the rotation speed of 620 rpm, the travel speed of 7.3 mm/min, and 13 mm/min. The tensile test was using a universal testing machine, and the results of the tensile test were related to the degree of crystallinity. X-ray diffraction (XRD) examined the crystallite size and degree of crystallinity. The thermal analysis was using thermogravimetry analysis/ differential scanning calorimetry (TGA/DSC). This paper explained the degree of crystallinity effects on the thermal stability at the weld nugget area due to travel speed. The findings showed FSW with a travel speed of 7.3 mm/min had a bigger crystallite size and degree of crystallinity than that with a travel speed of 13 mm/min. There was a fusion of crystals also recrystallization occurred. It was an effect of the difference in the length of time exposed to heat during the FSW process. A travel speed of 7.3 mm/min sample had high tensile strength because it obtained sufficient heat for an extra complete joint. In terms of thermal stability, the specimen with a lower travel speed showed a higher stability level than the specimen with a higher travel speed in the higher degree of crystallinity.
Highlights
The use of polymers would be more feasible if the joining can be done
Welding of the polymer could be one of the potential methods to join polymer materials that polymer welding dividing into three categories depending on the source of heating: heat conduction, heat radiation, and mechanical friction. The latter classified into two types: friction welding (FW) and friction stir welding (FSW) [2]
Specimen 620-7.3 had a tensile strength of 22.41 N/mm2
Summary
The use of polymers would be more feasible if the joining can be done. Recently, the investigation of several popular joining methods occurred, some of which were mechanical fastening and adhesive bonding [1]. Welding of the polymer could be one of the potential methods to join polymer materials that polymer welding dividing into three categories depending on the source of heating: heat conduction, heat radiation, and mechanical friction. The latter classified into two types: friction welding (FW) and friction stir welding (FSW) [2]. The process of FSW was a method centrally using a rotating tool This tool has a shoulder that rotates on the surface of the materials and a pin immersed at the joining line of two adjoining workpieces. The adjoining workpieces could be successful due to the heat resulted from friction between the shoulder and surface of workpieces and the effect of pin stirring [4]
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