The Effect of Electrode Angle on the Backward Directional Longitudinal Against Penetration Percentage. Jurnal Teknik Mesin, [S. l.], v. 12, n. 2, p. 116–119, 2022. DOI: 10.21063/jtm.2022.v12.i2.116-119. Disponível em: https://jtm.itp.ac.id/index.php/jtm/article/view/716. Acesso em: 21 agu. 2025.