Electron beam welding simulation and joint properties of TC4 titanium alloy and T2 copper were studied. By adopting the welding method of multiple offsets which means welding is carried out on copper first and then on titanium side

and the two welds are close but not connected

the tensile strength of Ti/Cu joints can be greatly improved. In order to explore the thermodynamic behavior of the joints

the finite element method (FEM) was used to analyze the temperature field

deformation and stress distribution

then the strengthening mechanism is discussed in combination with microstructure evolution and mechanical properties. Welding on titanium side can remelt the heterogeneous interface formed by welding on copper side

and improve its stress concentration. The tensile fracture shows that it is brittle cleavage f

racture

the phase composition on the fracture surface changes from TiCu to Ti

2

Cu

and the brittleness decreases.