Fatigue strength of longitudinal load-carrying welds in beams made of ultra-high-strength steel

The present study experimentally investigates the fatigue strength of longitudinally loaded welded joints in beam structures made ultra-high-strength steel. Hereby, effects different manufacturing methods and welding preparations on crack initiation locations box I section beams are evaluated. Specifically, experimental tests carried out these prepared with manual automatic welding, subjected to a constant amplitude four-point bending an applied stress ratio R = 0.1. results show variation strength, whereby high performance is achieved using both single- double-sided welds, particularly if continuous weld penetration controlled by sufficient support root face. Current design codes guidelines applicable, albeit some conservatism, for assessing longitudinal load-carrying • Fatigue welds steel was Experiments hollow sections S960 grade cracking from hot-rolled surface, root, imperfections In quality showed higher than standards.