Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes0-30899 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Volume 20 article 907 pages: 85-90

Bambang Kusharjanta*
Universitas Sebelas Maret Surakarta, Mechanical Enginering, Surakarta, Indonesia; Universitas Brawijaya, Mechanical Engineering, Brawijaya, Indonesia

Rudy Soenoko
Universitas Brawijaya, Mechanical Engineering, Brawijaya, Indonesia

Anindito Purnowidodo
Universitas Brawijaya, Mechanical Engineering, Brawijaya, Indonesia

Yudy Surya Irawan
Universitas Brawijaya, Mechanical Engineering, Brawijaya, Indonesia

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.

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The author appreciations the Ministry of Education and Culture of the Republic of Indonesia, for supporting this research in the doctoral program at Universitas Brawijaya, Malang, Indonesia.

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