In order to predict and control the welding deformation

the elastoplastic finite element model of the welded joint was established

and heat source model of the electron beam was checked to obtain the size of the plastic strain area of the welded joint. Then

the 3D shell element finite element model of the fan blade casing was established

and the welding deformation of the casing was simulated by using the inherent strain method

so as to obtain the deformation distribution during the welding process. The accuracy of the model was verified by measuring the deformation of the casing and comparing with the simulation results. Finally

by optimizing the welding sequence and welding pool width

the optimal scheme of controlling welding deformation was obtained through simulation calculation. The results showed that the average deformation error between simulation and actual measurement was only 10.3%. The 3D shell element finite element model of the center plane based on the inherent strain method was suitable for the deformation prediction of electron beam welding of large and complex thin-walled parts. The width of the molten pool on the weld was reduced to 2.7 mm

and the average radial deformation after welding was reduced by 30%. Controlling the weld width can significantly reduce the radial shrinkage and deformation of the casing

but the optimization of welding sequence has poor effect on deformation control.