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An ocean tol has been built in Indonesia. Thus, it is needed many ships to fulfill this programs. The marine ships are operated on sodium chloride (NaCl) environment, so that the ship materials have to be able to withstand the environments. The purpose of this study is to characterize the crack propagation of AA5083H116 and ER5356 electrode-welded materials under static loading in an environment containing 3.5 wt% of NaCl. This study was started with construction of the bending test equipment in accordance with the Brown and Beachem and ASTM E 1681. The IZOD notched specimens used in this test were prepared using electrical discharge machining (EDM) according to the ASTM E-23. The test was carried out at constant loading of 40 N with time variations. During the loading, the specimens were immersed in a 3.5 wt% of NaCl environment. The deflections and times during loading were then recorded and finally the specimens were fractured using liquid nitrogen. The crack lengths were measured by means of optical microscope in order to characterize the crack propagation vs stress intensity factor. The fracture surfaces of the specimens were examined using SEM-EDS to characterize their fractography and chemical elements. The results show that the crack propagation of welded materials of 10 mm/s speed travel was lower than the other and the fracture surface indicates intergranular fracture, while the chemical elements shows there are of Mg, Na, Cl elements on the fracture surface.