Actual Problems in Machine Building 2016 No. 3

Actual Problems in Machine Building. 2016. N 3 Innovative Technologies in Mechanical Engineering ____________________________________________________________________ 22 PROBLEMS IN THE OPERATION OF THE LAST-STAGE BLADES OF STEAM TURBINES AFTER THE REPAIR Filippov A. M. 1 , Head of department, Engineer, e-mail: len103126@yandex.ru, Aleksey.M.Filippov@tplusgroup.ru Golikova E. O. 1 , Engineer, e-mail: Evgeniya.Golikova@tplusgroup.ru Sidorov A. N. 2 , Director, e-mail: xpertizapb@mail.ru Azin A. A. 2 , Head of Laboratory, e-mail: Azin-72@yandex.ru 1 PJSC "T Plus", 16 Moskovskaja st., Yekaterinburg, 620014, Russian Federation 2 ExpertizaPB, Ltd, 4/2 Holmogorskaya, Perm, 614083, Russian Federation Abstract The existing technologies of repair of worn-out blades of the last stages of steam turbines do not provide a high degree of operational reliability. After repair of blades by welding the edges with the installation of protective plates damage to the blades occurs in places of welding of plates, on the holes for damping wire. The most common causes of damage are fatigue of metal and lack of proper heat treatment prior to restoration. Considered typical cases of damage of the blades after the repair. Recommended measures to improve operational properties after repair. Keywords blades for steam turbines, repairing, surfacing, damage, metal fatigue, operational properties