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Information × Registration Number 0218U001279, 0117U004894 , R & D reports Title Modeling of welding heat, physical processes and structure of a welded joint of steel 25H2NMFA popup.stage_title Head Dmitrik Vitaliy, Доктор технічних наук Registration Date 14-03-2018 Organization The Kharkov state polytechnical university popup.description2 The object of research is welded joint of rotor of steels The goal of the work is to obtain welded joints of 25H2NMFA steel with improved quality characteristics of their structure. For achievement this goal, welding heat of welded joint was modeled. Then, based on the simulation data, the parameters of the automatic welding mode of the rotor prototype were optimized. For research r structure of welded joints we used methods of light and electron microscopy, for research chemical makeup we used surface microprobe analysis method, the detection of nonmetallic inclusions was performed electrolytically Resistance to fatigue was determined in accordance with the provisions of GOST 23026-78 "Metals. Test methods for high-cycle and low-cycle fatigue " Improvement of the welding technology of the rotor manufacturing allowed to improve the quality characteristics of its structure and to increase the mechanical properties, which provides an increase lifetime of this rotor by 15-20% compared to the rotor manufactured by the standard technology. The expected economic effect of this new technology is about 25 million dollars. Similar work on improving the welding technology of rotor manufacturing we can see in CNIITMASH, Moscow. Field of application is power engineering Product Description popup.authors Глушко Альона Валеріївна Дмитрик Віталій Володимирович Рязанова-Хитровська Наталія Володимирівна Федорченко Тетяна Вікторівна popup.nrat_date 2020-04-02 Close