Marsudi, S. 2021. Analysis of Welding Defects Using Down Hand Welding Techniques on the Hull Plate of a Ship. Zona Laut Jurnal Inovasi Sains Dan Teknologi Kelautan. 2, 1 (Mar. 2021), 30–34. DOI:https://doi.org/10.62012/zl.v2i1.13572.