As an example of alloy OT4 it is shown, that at diffusion welding of titanium alloys with the original globular (equiaxed fine-grained) microstructure, the accumulated strain value of the welded blanks can be reduced (more than 2 times) if the welding process is performed in the temperature range of polymorphic transformation (∼950 °С). In such a case, use the welding pressure only at the first stage to form a physical contact with an area of at least 50% of the nominal, and then produce an isothermal annealing without pressure, the duration of which is temperature dependent. When using a temperature higher than the end of polymorphic transformation (∼1000 °C), the duration of annealing is reduced by almost 10 times compared with annealing at 950 °C.