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The process of assembly by welding, in marine structures, led to the creation of microstructural heterogeneities zones. Welded structures generally contain defects such as lack of penetration, slag inclusion, porosity, and misalignment. Generally these zones can be discontinuities geometrical. At the origins of stress concentration, these regions are favourable sites where fatigue cracks can initiate and propagate. In this study, the 3D finite element method is used to analyze the distribution of stress (strain) generated by the presence in the weld nugget of a pore formed during the welding process. This analysis was made in the matrix-pore interface. The effects of density and pointed corner degree of pore on the stress levels were also analyzed.

Effect of Density and Pointed Corner Degree of Pore on Local Stress in Welded Structures: Defect in Marine Structures