Authors Yusuf UmardhaniMechanical Engineering Department, Faculty of Engineering, Diponegoro University, Jl. Prof. H. Soedarto, SH, Tembalang-Semarang 50275, IndonesiaSri NugrohoMechanical Engineering Department, Faculty of Engineering, Diponegoro University, Jl. Prof. H. Soedarto, SH, Tembalang-Semarang 50275, IndonesiaWahdan Iqbal RadityaMechanical Engineering Department, Faculty of Engineering, Diponegoro University, Jl. Prof. H. Soedarto, SH, Tembalang-Semarang 50275, Indonesia Abstract The shipping industry is an important sector in supporting maritime transportation and logistics. In the process of building and repairing ships, welding is the main method in connecting structural materials, especially on the deck of ships that function as operational loads. However, the welding process does not always result in a perfect connection as it is affected by welding parameters, material conditions, operator techniques, and welding positions. This study aims to identify the types of welding defects that occur on the deck of the Cargo ship, analyze the causes, and determine prevention and repair efforts. The research method used is an analytical descriptive method through field observation, documentation, interviews, and literature studies. The results showed that the dominant welding defects found were porosity, undercut, slag inclusion, and spatter. The main factors causing these defects include inappropriate welding parameters, unclean material conditions, and suboptimal welding techniques. Prevention efforts can be carried out through controlling welding parameters, improving welder skills, and stricter quality control. Keywords Welding defects welding ship deck quality weld joints cargo ship. Citation of this Article Yusuf Umardhani, Sri Nugroho, & Wahdan Iqbal Raditya. (2026). Analysis of Welding Defects on the Deck of the Cargo Ship. International Current Journal of Engineering and Science (ICJES), 5(6), 1-6. 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