History of Science and Engineering Annotation << Back Development of Equipment for Implementation of Rotary Friction Welding Processes Yakhin A.V., Medvedev A.Yu., Udalova E.A., Khuziev I.F., Bochkarev P.I. Friction rotary welding is an effi cient machine method for joining rods, pipes, shafts and other similar parts with a circular cross-section. This work analyzes changes in the design of welding machines associated with the need to weld sections of increasingly larger diameters and areas. It is shown that the transition from a layout with rotation of the part from an electric motor (conventional friction welding) to rotation of the part from a fl ywheel (inertial friction welding) ensured that the costs of producing equipment for welding of large diameters were maintained, as well as its operation within reasonable limits. The current trends in aircraft engine building towards the use of materials that cannot be welded by fusion welding make inertial welding the only alternative in the manufacture of gas turbine engine rotors with a diameter of 200 mm or more. In the aviation industry, the share of costs for mastering production and developing technology is very high, so these costs must be taken into account along with the costs of purchasing and operating equipment. The work proposes a way to signifi cantly reduce the costs of developing production through the modernization of machines that implement convection welding with direct drive. Keywords: control system; equipment; friction welding; inertial friction welding; rotational friction welding. DOI: 10.25791/intstg.4.2024.1475 Pp. 17-22.