PENGARUH VARIASI KECEPATAN PUTAR DAN BENTUK PIN TOOL TERHADAP SIFAT TARIK PENGELASAN FRICTION STIR SPOT WELDING PADA POLYPROPYLENE

Friction stir spot welding (FSSW) is a method of joining a material that utilizes heat from the friction of the pin and shoulder tool. This FSSW welding process does not use additional materials or fillers during the welding process. The material used in this research is polypropylene. Polypropylene is widely used in the industrial world because it has high strength and light weight. The rotational speed and the shape of the tool pin affect the results of the material joining process from the macro structure and mechanical properties. This study aims to determine the effect of variations in rotational speed and shape of the pin tool on the macro structure and mechanical properties of polypropylene material using the FSSW welding method. The material used in this study is polypropylene with a thickness of 3 mm, a width of 30 mm, and a length of 150 mm. The welding process is carried out using variations in rotational speed of 10,000 rpm, 10,500 rpm, and 11,000 rpm. For variations in the shape of the pin tool used in the study, the pin tool 1 flat cylinder and the pin tool 2 conical cylinders. In this research, 3 tests were carried out, namely macro structure testing, hardness testing and tensile testing. The results showed that the variation of the pin tool 2 cylinder cone / 11,000 rpm resulted in the highest average tensile load capacity with a value of 953.67 N. This indicates that the higher the rotational speed variation and the use of the right type of pin tool greatly affects the welding results. . The use of pin tool type 2 conical cylinder is more recommended because it produces an average value of tensile load capacity which is better than the type of pin tool 1 flat cylinder.