Abstract
High strength steel (HSS) used in lifting equipment structure and metallic framework are known to have high static strength, good stiffness and very good weldability however knowledge of fatigue behaviour of HSS in welded structure is not sufficient in order to have representative and probabilized S-N curves to modify the design codes. In this study, a large fatigue test campaign was performed on cruciform and symmetrical butt welded joints of high and very high strength structural steel plates. Numerous fatigue tests were carried out for each configuration in as welded condition. To improve the fatigue performance, post-welding improvement techniques (burr grinding and TIG dressing) were performed on the welded specimens. All fatigue results were analysed using a statistical approach defined in the Eurocode 3 standard. It was noticed the impact of weld quality on fatigue performance. The application of post-weld improvement techniques (TIG dressing and burr grinding) leads to an additional improvement of the fatigue strength and reduces the scattering (COV), in comparison with the current welding standards or recommendations. The limited influence of the base metal yield stress on fatigue performance is explained by the local microstructure at the weld toe where fatigue cracks initiate; at this location, the mechanical properties are similar whatever the steel grades.
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