A rotor wheel is one of important knots of circulation pump and, in spite of rigorisms at making, the grounded comparison of results of calculations of the tensely-deformed state and experimental information is required for providing of high reliability of construction. For realization of this problem a calculation model designing the defect of welding stitches between shoulder-blades and basic and covering disks as the gap of similar to the crack is offered. This model in future will be used for estimation of reliability construction and extension of resource of driving wheel.