The assessment of stress concentration factorsStress concentration factor (SCFs) plays a pivotal role in ensuring the structural integrity of welded marine structuresWelded marine structure. This research article presents a benchmark study that aims to advance the methodology for SCF analysis through the integration of state-of-the-art technologies. In particular, the research centers on utilizing integrated 3D laser scanning technology (LST) in conjunction with finite element analysis (FEAFinite Element Analysis (FEA)) to improve the precision of stress concentration factorStress concentration factor (SCF) assessments. Complex welding geometries inherent in marine structures are effectively captured using 3D LST3D LST, facilitating the development of precise 3D FEAFinite Element Analysis (FEA) models for accurate SCF calculations. Additionally, a complementary two-dimensional FEAFinite Element Analysis (FEA) model is established to simulate an idealized marine welded structure geometry. To further optimize SCF estimation, a non-linear response surface methodology (RSM) is integrated into the two-dimensional FEAFinite Element Analysis (FEA) model, deriving analytical equations that express SCFs as functions of key welding parameters. We analyse the capabilities of this technique and compare it to earlier research. The findings of this investigation are in line with earlier research.