Кафедра "Зварювання"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/5280

Офіційний сайт кафедри http://web.kpi.kharkov.ua/svarka

Кафедра "Зварювання" заснована у 2010 році професором Віталієм Володимировичом Дмитриком. Ініціював створення кафедри особисто академік Борис Євгенович Патон. Її створення зумовлене проханням провідних підприємств – флагманів економіки України: ОАО "Турбоатом", ОАО "Електроважмаш", ОАО Харківський турбінний завод, ГП завод ім. Малишева, ОАО Харківський авіаційний завод та ін.

Кафедра входить до складу Навчально-наукового інституту механічної інженерії і транспорту Національного технічного університету "Харківський політехнічний інститут".

У складі науково-педагогічного колективу кафедри працюють: 2 доктора технічних наук, 4 кандидата технічних наук; 2 співробітника мають звання професора, 3 – доцента.

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3-D моделювання дії сили тертя при свердленні глибоких отворів спіральними свердлами
(Українська інженерно-педагогічна академія, 2010) Чернякова, О. В.; Маршуба, В'ячеслав Павлович
Composite material for hardening of tillage machines working bodies containing titanium and chromium borides synthesized using SHS-process
(Інститут металофізики ім. Г. В. Курдюмова НАН України, 2020) Luzan, S. A.; Sidashenko, A. I.; Luzan, A. S.
The article presents results of the study of the developed composite material based on the powder of Ni–Cr–B–Si system modified with the composite material obtained using the process of self-propagating high-temperature synthesis (SHS) and contained titanium and chromium borides. The microstructure of composite material weld overlay coatings is a matrix material—PG-10N-01 alloy, where solid inclusions such as titanium diboride and chromium boride are uniformly distributed. As found, the composite material has high abrasive wear resistance and can be recommended for hardening of tillage machines working bodies.
Composite material for surfacing, obtained by self-propagating high-temperature synthesis
(Scientific and Technological Corporation "Institute for Single Crystals", 2023) Luzan, S. O.; Sytnykov, P. A.
This paper presents the results of theoretical and experimental studies of the development of a composite material obtained by self-propagating high-temperature synthesis (SHS), which is used to modify a deposited alloy of the NiCrBSi system (self-flxing alloy PG-10N-01). The source components of the composite material are powders of titanium Ti, technical carbon C, aluminum powder Al, iron oxide Fe₂O₃, thermosetting powder PT-NA-01, and refractory clay PGOSA-0. The mechanical activation of the charge was performed in a ball mill for 15 minutes at 130 rpm and the ratio of the mass of the charge to the mass of the grinding media was 1:40. The SHS process was initiated by heating a nichrome spiral with a diameter of 0.8 mm in an argon Ar environment. As a result of deposition, the layers with a dense and multiphase structure are formed. The deposited layer of PG-10N-01 alloy consists of a solid solution of nickel (γ-Ni), boride phase Ni₃B and inclusions of chromium carbide Cr3C₂ and boron carbide B₄C. When the synthesized composite material was added to the PG-10N-01 alloy, titanium carbide TiC and silicon carbide SiC were additionally detected in the deposited layer, which lead to an increase in the layer microhardness. The phase composition of the layer deposited from a mechanical mixture of 10 % (Ti-C-Al-SiO₂-Al₂O₃-Fe₂O₃-PT-NA-01) + 90 % PG-10N-01 is a solid solution of γ-Ni nickel, nickel boride Ni₃B, titanium nitride TiN, chromium silicate CrSi, and intermetallic FeAl. The microhardness of this layer is 20 % lower than that of the PG-10N-01 alloy layer.
Composite material, obtained using by self-propagating high-temperature synthesis
(Ukrainian Nuclear Society National Science Center "Kharkiv Institute of Physics and Technology" NAS of Ukraine, 2024) Sytnykov, P. A.; Luzan, S. A.
Creep pores in welded joints of steam pipelines
(Springer Science+Business Media, LLC, 2023) Dmytryk, V. V.; Glushko, A. V.; Poznyakov, V. D.; Kasyanenko, I. V.
Formation of creep pores and their transformation into creep cracks in the metal of welded joints of steam pipelines made of heat-resistant pearlite steels (12Kh1MF and 15Kh1M1F), with the long-term operation (over 270,000 h) under creep and low-cycle fatigue conditions (via repeated start-stop modes), largely depends on the structural and phase state of the welded joints. Welded joints are characterized by structural heterogeneity caused by welding heat. The heterogeneity increases with their further service life. This heterogeneity in the metal of welded joints is much greater than the heterogeneity of the base metal of the steam line, which has not been subjected to welding heat. In long-term operation, the structure of steam lines and their welded joints is transformed into a ferritic-carbide mixture at different rates. The rate of this transformation in the metal of welded joints is much higher than in the base metal of steam lines. It was found that the intensity of damage to the metal of welded joints by pores and creep cracks largely depends on the level of transformation of the initial structure into a ferritic-carbide mixture. It was found that creep pores are mainly formed along the boundaries of ߙ-phase grains and, to a lesser extent, along the grain body. We studied the peculiarities of physical and chemical processes occurring in the metal of welded joints of steam pipelines. We established a link between the self-diffusion of alloying elements (chromium, molybdenum, and vanadium) and the movement of dislocations. It was found that pore nucleation in the metal of welded joints occurs mainly at the boundaries of ferrite and bainite grains, where the coagulating carbides M23C6 and M7C3 are located rather than along the grain body. In the process of diffusion movement, vacancies, by merging, are transformed into microcontinuities that move in the direction of vacancy movement. It was found that the formation of creep pores in the metal of welded joints largely depends on its structural and phase state. Creep pores are most intensively formed in areas where the structure consists of tempering bainite, ferrite, and coagulating globularized pearlite. It was found that with an increase in the metal deformation of the zone of thermal influence of welded joints, the formation of creep pores is accelerated.
Device for initiating the SHS process
(2023) Luzan, S. A.; Sytnykov, P. A.
The structure and operating principle of a special device for initiating the SHS process are described. The device consists of a tripod with a sample placement table, a movable dielectric clamp with a glowing filament, and a power transformer.
Electricity demand management as a supplement to distributed generation
(2023) Pantielieieva, Iryna; Glushko, Alyona; Shmatko, Nataliia
Today, the energy industry is undergoing a radical transformation, the main engine of which is technological innovations, which provide opportunities for the transition to a fundamentally new stage of development. In recent years, there have been changes that forced a rethinking of the requirements for generation facilities, network infrastructure and, in general, the organization of the electricity industry and electricity markets. The increasing wear and tear of equipment, the involvement of distributed energy resources, the change in the role of traditional sources of energy and heat carriers, the growth of demand for electricity and the transformation of its quality characteristics, the change in the behavior of consumers - all this requires the study of the factors of the spread of new technologies in electricity for the transition to the next energy system. Therefore, the modern concept of the development of the electric power industry envisages increasing the active role of electricity consumers. The consumer moves away from the position of «passive» consumption and gets the opportunity to actively change his load with the help of his own (distributed) generation or demand management measures. The article analyzes the possibility of accounting for distributed generation and demand management when planning the development of electric power systems. The method of their joint examination with the help of a «virtual power plant» is described.
Fractal Analysis of Structural and Phase Changes in the Metal of Welded Steam Pipe Joints
(2021) Garashchenko, Ya.; Glushko, A. V.; Kobets, O.; Harashchenko, O.
The research results of the ability to assess the boundaries of structural components’ geometric complexity, which are visible in a metallographic analysis of the metal samples of Welded Steam Pipe Joints, considering the operating time, are presented. The estimation of the complexity of grain boundaries was made based on a statistical analysis of fractal dimensions obtained by the cellular method for measuring the grain boundary length. The fractal analysis of microsection images is carried out using a developed program. The computer system was tested for several samples cut from sections of steam pipelines with different operating times, operated under conditions of creep and low-cycle fatigue. A comparative analysis of fractal dimensions of structural components’ boundaries in the microsections images of various metal sections with different operating times is carried out. The research and comparative analysis are carried out for the heataffected zone, base metal, weld, and substrate areas. As a result, the possibility of assessing the complexity of the boundaries of structural components in the steam pipelines metal and their welded joints was confirmed based on the analysis of statistical characteristics of the distribution of their fractal dimension.
Identification of Parameters of Electrical Signals in Order to Control Energy Facilities
(2021) Pantielieieva, Iryna; Shmatko, Nataliia; Oliinyk, Yuliia; Glushko, Alyona
Methods of statistical estimation of signal parameters are generalized. The errors of correlation estimates, which are caused by the non-integer number of half-periods of the analyzed signal, are analyzed. The application of correlation functions to solve the problem of increasing the accuracy of estimates of the phase shift and the amplitude of the electrical signal over a limited time interval is presented. The information on development of correlation functions for the decision of problems of fast estimation of the increased accuracy of a phase shift and amplitude of an electric signal changing sinusoidally, industrial frequency on a time interval making a part of its period is presented. The practical check of accuracy and fast action of algorithms is given.
Improvement of the Mechanical Characteristics, Hydrogen Crack Resistance and Durability of Turbine Rotor Steels Welded Joints
(2022) Balitskii, A. I.; Dmytryk, V. V.; Ivaskevich, L. M.; Balitskii, O. A.; Glushko, A. V.; Medovar, L. B.; Abramek, K. F.; Stovpchenko, G. P.; Eliasz, J. J.; Krolikowski, M. A.
This article is devoted to the following issues: calculating the values of temperatures obtained by simulating welding heating and the subsequent implementation of the welding process at the given mode parameters made it possible to obtain a welded joint of the rotor with an improved initial structure and increased mechanical properties, hydrogen resistance and durability by up to 10–15%; simulating welding heating in the areas of fusion, the overheating and normalization of the HAZ and the formation of austenite grains; specified welding heating creates the conditions for the formation of new products of austenite decomposition in the form of sorbitol in the area of the incomplete recrystallization of the HAZ. In air and gaseous hydrogen, the destruction of the combined joints took place on the weld metal, as well as on the fusion areas, the overheating and the incomplete recrystallization of the HAZ of 20H3NMFA steel as the base metal. Structural materials have a relatively low strength and high fracture toughness in air. This is manifested in a significant reduction in the elongation (d), the area (y) and critical stress intensity factor (KIc) of welded joints and the endurance limit of cylindrical smooth rotor steel specimens, which were cut from transverse templates. Welded joints in the whole range of load amplitudes are sensitive to the action of hydrogen.
Improvement of welding technology of high power turbine rotor
(National Science Center "Kharkov Institute of Physics and Technology", 2024) Dmitrik, V. V.; Glushko, A. V.; Kasianenko, I. V.; Syrenko, T. O.; Baranova, T. A.; Asieieva, I. V.
In order to solve the problem of increasing the reliability and increasing the service life of welded joints of rotors of high-power turbines of nuclear and thermal power plants, the technology of their manufacture was improved. The improved technology provided obtaining welded joints of rotors with improved characteristics of their original structure and higher mechanical and physical properties. The given properties were determined by comparing with similar properties that are characteristic of the welded connection of the rotor made according to standard technology. The improvement of the technology involved the modeling of welding heating of manufactured joints, which made it possible to optimize the parameters of the mode of automatic welding of the rotor made of 25Х2НМФА steel. For the first time, the thermal problem was solved as a conjugate one under the conditions of the Navier-Stokes and Fourier laws, which provided the results necessary for increasing the reliability of the rotors, as well as increasing their resource.
Plasma coatings based on self-fluxing NiCrBSi alloy with improved wear resistance properties
(Інститут проблем машинобудування ім. А. М. Підгорного НАН України, 2023) Sytnykov, P. A.
The structure and properties of plasma coatings sprayed with a composite material based on a self-fluxing NiCrBSi alloy (PG-10N-01 alloy) modified with a composite material obtained by self-propagating high-temperature synthesis were studied. Titanium powders, carbon black, aluminum, iron oxide, PT-NA-01 thermosetting powder and PGOSA-0 refractory clay were used as the initial components of modified with a composite material. Mixing and mechanical activation of the initial powders was carried out in a BM-1 ball mill for 15 minutes at 130 rpm in a ratio of 1 to 40 of the mass of the charge to the mass of the falling bodies (steel balls with a diameter of 6 mm). Initiation of the self propagating high-temperature synthesis was carried out using a special device by introducing a heated nichrome spiral. The process of coatings spraying was performed on the MPN-004 microplasma spraying unit at a current of 45 A, a voltage of 30 V with a distance of 100 mm on samples made of 65G steel with a thickness of 3 mm. Argon was used as a plasmaforming and shielding gas. In order to substantiate the feasibility of the self-propagating high-temperature synthesis, a part of the samples was sprayed with a self-fluxing alloy PG-10N-01 with the addition of a mechanical mixture of starting powders. It was established that as a result of plasma spraying of the PG-10N-01 alloy and the composite material of the modified with a composite material + PG-10N-01 composition, coatings with a dense and multiphase structure are formed. The microstructure of the PG-10N-01 alloy coating consists of a solid solution based on nickel (γ-Ni) with inclusions of nickel borides Ni₃B and chromium carbides Cr₃C₂. When adding modified with a composite material in a nickelbased solid solution, in addition to the phases indicated above, borides of titanium TiB₂, carbides of titanium TiC and silicon SiC were detected. Their presence leads to an increase in the microhardness of such coatings and their greater wear resistance under conditions of abrasive wear in comparison with the spraying coating of the PG-10H-01 alloy.
Recrystallization in the metal of welding joints of steam trucks
(2019) Dmytryk, V. V.; Glushko, A. V.; Tsaryk, A. K.
The recrystallization process in the structure of welded joints of steam pipelines from heat-resistant pearlitic steels, operated for a long time under creep conditions (Te = 545…585 °С, Рe = 20…25 MPa), reduces their performance. Studying the peculiarities of the recrystallization process will allow slowing down its passage, which is important for increasing the service life of welded joints of steam pipelines, which are characterized by the presence of a certain structural heterogeneity.
Repair technology of machinery and equipment
(Ltd "PromArt", 2017) Sidashenko, O.; Tikhonov, O.; Luzan, S.; Skoblo, T.; Pilgui, N.; Avetisian, V.; Saychuk, O.; Manilo, V.
While preparing the lectures, it was used domestic and foreign experience in machinery repair, relevant research and developments and results of basic research carried out and implemented in the educational process by the authors. The lectures were published in Ukrainian and English in separate books. This lecture course can be useful for students and teachers of engineering specialties of higher educational institutions of III-IV accreditation levels, masters, graduate students, and a wide range of engineering and technical personnel of machine building and repair companies and technical service workshops of various forms of property both in Ukraine and foreign English-speaking countries.
Research into defectiveness of welded joints of steam pipes operated over a long time
(Українська державна академія залізничного транспорту, 2016) Glushko, A.
Проведено аналіз пошкоджуваності металу зварних з'єднань паропроводів із Cr–Mo–V теплостійких перлітних сталей, які тривалий час експлуатуються в умовах повзучості та малоциклової втоми. Наведені зварні з'єднання пошкоджуються одночасно порами повзучості та тріщинами втоми. Розглянуто фактори, які викликають пошкоджуваність, а також залежність пошкоджуваності від структури зварних з'єднань і умов експлуатації. Їх пошкоджуваність переважно має крихкий характер.
Structural-phase state and properties of sprayed plasma coatings based on self-fluxing alloy of NiCrBSi system with the addition of shs composites
(Global Science Center LP, 2023) Sytnykov, P. A.
he structural-phase state and mechanical properties of plasma coatings sprayed with a composite material based on a self-fluxing alloy of the PG-10N-01 NiCrBSi system modified with a composite material obtained using self-propagating high-temperature synthesis were studied.
Study of the structure and properties of deposited layers of NiCrBSi alloy, modified with composite material
(Slovenian Research and Innovation Agency, 2023) Sytnykov, P. A.
The structure and properties of deposited layers with a self-fluxing PG-10N-01 alloy of the NiCrBSi system, which is modified with composite material obtained by selfpropagating high-temperature synthesis, were studied. Powders of titanium, technical carbon, refractory clay, aluminum, iron oxide, and PT-NA-01 thermosetting powder are used as the initial components of the modifying composite material. The powders were mechanically activated in a ball mill, pressed into a cylindrical sample, and then subjected to the process of self-propagating high-temperature synthesis. The deposition of the samples was carried out with a non-fusible graphite electrode with a diameter of 9.5 mm, at a current of 110 A, using an inverter power source SV-290NK. It was established that the structure of the layer deposited with the PG-10N-01 alloy consists of a solid solution based on nickel (γ-Ni) and a eutectic formed on its basis with Ni₃B boride. Single inclusions of carbides of chromium Cr3C₂ and boron B₄C were also detected in the deposited layer. When adding a modifying composite material to the PG-10N-01 alloy, the structure of the deposited layer consists of γ-hard solution and eutectics, strengthened by carbides of titanium TiC and silicon SiC, which increase the microhardness and wear resistance of the layer. The microhardness of the layer deposited with the composite material, which contained 10% of the modifying component, is 660 HV, which exceeds the microhardness of the layer deposited with the PG-10N-01 alloy, which is equal to 510 HV. Based on the results of the research, operational tests of the set of duckfoot blades of the KPP-8 semi-trailer cultivator, aggregated with the New Holland T 6090 tractor, were carried out in the conditions of the Kamianuvatka farm (Novoukrainka district, Kirovohrad region). Based on the tests, it was proved that the relative wear resistance of duckfoot blades made of 65G steel, strengthened on the reverse side according to the "toe-working blade" scheme by depositing a layer of composite material is 1.7 times greater compared to the wear resistance of blades made by standard technology logic.
Абразивна зносостійкість плазмових покриттів, напилених композиційним матеріалом, одержаним з використанням СВС-процесу
(Академія Прикладних Наук, 2023) Ситников, Павло Андрійович
Автоматичне керування зварюванням
(2020) Маршуба, В'ячеслав Павлович; Сітніков, Борис Валентинович
Викладено стислі теоретичні відомості та вказівки для виконання лабораторних робіт з дисципліни "Автоматичне керування зварюванням", які дозволяють розв’язати ряд науково-практичних задач з проектування зварювальних процесів при виробництві зварювальних конструкцій. Для студентів денної та дистанційної форм навчання спеціальності 131 "Прикладна механіка" за спеціалізацією 131-11 "Зварювання та спорідненні процеси і технології".
Адгезионная природа образования пакетов стружки в стружечных канавках при глубоком безвыводном сверлении литейных алюминиев
(Харьковский государственный политехнический университет, 1998) Маршуба, Вячеслав Павлович
Adhesion nature of forming and growth of tightly packed packets of chip in chip flut-ter's of twist drills at deep one passed drilling of holes in base members made of cast alumi-num aloes on the transfer machines and automatic lines.