Experimental investigation and numerical simulation of the friction stir spot welding process
This paper presents an experimental analysis and a numerical simulation of the friction stir spot welding (FSSW) process on aluminium alloy 5754 plates. The experiments were done in order to analyse the influence of different welding regimes on the welding force. The simulation of the FSSW process was carried out and the equivalent plastic strain, temperature and welding force were obtained. The shape of the spot weld in the simulation is close to the actual shape obtained by the experiments. The trends of the experimental and the simulated welding force variation over time are quite similar The obtained results of the presented study lead to a conclusion that the presumptions taken in the simulation are reasonable and the model quite realistically defines the FSSW process. The FEM model could be useful for prediction of rational FSSW regimes in order to lower welding forces and, as a consequence, to decrease tool wear.