Analyzing Defects in One-Step Double-Acting Friction Stir Welded of Hollow Aluminum Panel: Influence of Travel SpeedEricha Dwi Wahyu Syah Putri, Triyono, Aditya Rio Prabowo, Muizuddin Azka and Nurul MuhayatE3S Web Conf., 576 (2024) 06013DOI: https://doi.org/10.1051/e3sconf/202457606013