Strength and fatigue analysis of welded structures

Uncertainty about weld strength and fatigue performance creates risk in load-bearing steel structures exposed to static and cyclic loading. Welding alters material behaviour through residual stresses, geometric discontinuities and heat-affected zones, while fatigue cracks often initiate at weld details. Without verified calculations, structures risk deformation, premature failure, repairs and downtime. 

Calculation basis for welded structures

Strength and fatigue analysis provide documented verification that welded joints can withstand realistic load conditions throughout their intended service life. Analyses consider weld geometry, material properties, residual stresses and fatigue behaviour. Finite element method (FEM) simulations identify stress distribution and critical details, supported by strain-gauge measurements where required. All assessments follow Eurocode 3 and International Institute of Welding (IIW) guidelines, providing documented support for design approval and structural decisions. 

Unassessed welding effects weaken structural reliability 
When residual stresses and heat-affected zones are not analysed, welded joints may not achieve the required strength or fatigue resistance. 

Missing verification delays approval and decisions 
Without clear calculation and assessment documentation, design approval and authority review become uncertain and time-consuming. 

Unpredicted deformation causes rework and fit-up issues 
Lack of reliable analysis makes welding distortion difficult to control, leading to misalignment, corrective work and compromised performance. 

Unclear fatigue life increases risk of premature failure 
When stress levels and fatigue behaviour are not quantified, remaining lifetime and inspection planning cannot be defined with confidence.