Abstract
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°, 4°, 5° and 6°) 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° 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° 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° and 6°, caused maximum impact strength for glass and carbon fiber composites, respectively.
Highlights
Friction stir welding (FSW) is a relatively new joining technique developed by the welding institute (TWI) Cambridge, in 1991 [1]
The results indicated that the tensile shear strength was maximum when rotational speed, welding speed, tilt angle and tool pin geometry were 1000 rev.min−1, 20 mm.min−1 and 1◦ respectively with threaded cylindrical-conical tool
When the rotational speed was less than 2000 rev.min−1, wormhole at the retreating side of the weld was observed which could be due to insufficient heat generation and insufficient matrix transportation [37]
Summary
Surface porosity and voids so better surface appearance and higher tensile shear strength in comparison to other tools They [30] studied the effects of important friction stir welding process parameters such as tool rotational speed, welding speed, tilt angle and tool pin geometry on tensile shear strength of lap joining polypropylene composite plates having 20 wt% glass fiber using the Minitab software and the Taguchi method of design of experiments. The influence of different parameters such as tool rotational speed linear speed and tilt angle on mechanical properties such as tensile strength and Izod impact of two types of polypropylene composite plates with 30% glass and 30% carbon fiber with 5 mm thickness have been investigated. The best tool pin geometry used in this study was obtained using the threaded taper pin with chamfer according to the previous research [33]
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