Nugroho, Aris Widyo, Muhammad Rifai Dwi Saputra, and Cahyo Budiyantoro. “Pengaruh Kecepatan Putar Tool Dan Sudut Shoulder Sambungan Friction Stir Spot Welding Pada Bahan Polypropylene”. Semesta Teknika 22, no. 2 (November 15, 2019): 183–193. Accessed April 30, 2025. https://journal.umy.ac.id/index.php/st/article/view/8628.