Friction stir welding is one of the newest methods of metal welding. The method is constantly being developed and friction stir spot welding (FSSW) is one of its varieties. The method is mainly used in the aircraft, automotive and shipbuilding industries. During the process, heat is generated as a result of friction between the tool and materials as well as plastic deformation of the joined materials. The paper presents a numerical analysis of welded structures made of 6061-T6 aluminium alloy. The specimens were joined by refill FSSW. This method joins metals in a solid state. The numerical calculations were performed using the ADINA System based on the finite element method. The sheets were modelled with shell elements and the joints were modelled with 3D-solid elements. The experimental investigations were carried out using a non-contact system allowing for measuring displacements and strains in real time. The numerical results were compared with the test ones. The structures were assessed regarding strength and the possibility of their application in the aircraft industry.Keywords Finite element method Á Aluminium 6061-T6 Á Refill friction stir spot welding (RFSSW)

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Jednym ze sposobów konstruowania przęseł mostów średniej rozpiętości jest stosowanie zespolonych dźwigarów stalowo-betonowych typu VFT, które przedstawiono między innymi w pracach [1, 2]. W rozwiązaniu tym stalowa blachownica spawana prefabrykowana jest wraz z półką żelbetową, stanowiącą jednocześnie deskowanie dla monolitycznej płyty pomostu, betonowanej podczas montażu. Zespolenie belki z płytą zapewnione jest za pomocą łączników sworzniowych (rys. 1).