An investigation of FSW process parameters effects on mechanical properties of PP composites

In this paper, effect of friction stir welding (FSW) process parameters on tensile and impact strength of polypropylene (PP) composite welds with 30% short glass fiber and 30% short carbon fiber are studied. Plates of 5 mm thickness were butt welded under different tool rotational speeds (1250, 1600, 2000 and 2500 rpm), work linear speeds (8, 12, 16 and 20 mm. min(-1)) and tool tilt angles (3 degrees, 4 degrees, 5 degrees and 6 degrees) using the Taguchi method design of experiments (DOE). Standard tensile and Izod impact tests were carried out to determine tensile and impact strength of the welded joints. It was observed that for glass fiber composites the specimen welded at the rotational speed of 2000 rpm, linear speed of 8 mm. min(-1) and tilt angle of 6 degrees had the maximum tensile strength. For carbon fiber composites the specimen welded at the rotational speed of 2500 rpm, linear speed of 8 mm. min(-1) and tilt angle of 6 degrees showed the maximum tensile strength. The maximum impact strength was also obtained at the rotational speed of 2500 rpm and linear speed of 8 mm. min(-1) for both composites whereas tilt angles of 5 degrees and 6 degrees, caused maximum impact strength for glass and carbon fiber composites, respectively.