PSI - Issue 27

Eko Surojo et al. / Procedia Structural Integrity 27 (2020) 14–21 Surojo et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusions The application of material uses in marine, and offshore engineering structures is of particular concern. The underwater welding process can affect the base metal composition and mechanical properties that occur at the joint of the weld metal. The chemical composition that changes can affect the welding capability in underwater welding, e.g., as an additional carbon content. If the carbon in the material increases, so the weldability will decrease. The high carbon content in the material will cause the mechanical properties of the material to become hard and brittle. Furthermore, water temperature produces high cooling rates and finer microstructures with high hardness. If the hardness and tensile strength of the material increase, so the material crack increase too. Crack in the material can reduce the reliability of the underwater welding structure because the welding material becomes brittle and fracture. 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