Implementing the process of hollow-cathode vacuum welding at the plant requires correct mathematical processing of experimental data in order to obtain dependencies of depending on various cutting edges formed of the weld on welding conditions. A technique for predicting the geometry of the welded joints obtained by hollowcathode vacuum welding depending on the welding variables is proposed. The analysis was conducted on samples made of high-strength titanium alloys VT6S. The technique showed that the combined method based on a joint analysis of the results of theoretical and experimental studies allows predicting the geometrical parameters of the penetration zone with a sufficient degree of accuracy. This technique provides a high accuracy of the calculation of the weld sizes in a predetermined range of welding conditions and can be applied in a production environment.