Global dynamic robust control of friction stir welding of high strength aluminum alloy

Aiming at the softening problem of 7075 superhard aluminium welded joints such as hot cracks and porosity holes in traditional fusion welding process, a dynamic robust control model based on the relationship between friction stir welding process parameters and welded joint strength was established. According to the non-linear relationship between global motion estimation and welding parameters, a dynamic robust control model of tool pin motion was established, and the tensile shear strength of welded joints were calculated. The physical parameters such as tensile strength and hardness were calculated. A robust dynamic evolutionary optimization model of welding process parameters was established remaining process to realize real-time optimization control of process parameters. A series of strength tests of welded joints based on the model showed that the proposed model was reasonable and could meet the needs of engineering, which have practical value in engineering.