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| Знайдено в інших БД: | Реферативна база даних (4) |
Список видань за алфавітом назв: Авторський покажчик Покажчик назв публікацій  |
Пошуковий запит: (<.>A=Biloborodchenko V$<.>) | |||
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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Biloborodchenko V. Applied Model of Assessment of Intensity of the Stressed Deformed State of Pipelines by Evaluation of Magnetic Anisotropy of Coercive Forces. Part 1 [Електронний ресурс] / V. Biloborodchenko // Ukrainian journal of mechanical engineering and materials science. - 2017. - Vol. 3, Num. 1. - С. 27-36. - Режим доступу: http://nbuv.gov.ua/UJRN/ujmems_2017_3_1_5 The problem of applied diagnostics, statistically rigorous by the proposed model analogue, running stressed-deformed state of the main (trunk) shell is studied by the method of magnetic coercimetria. The relationship between the parameters of the loop of magnetic hysteresis is stochastically related with structural and mechanical state of the material of the pipeline wall and with the rest of equal conditions allows to effectively detect the zone of concentration of local stresses on the stage of their forming and development (propagation) on the basis of quantitative comparative analysis of their value with calculated equivalent mechanical stresses in principal (main) planes for particular pipe material considering that the operational stresses shouldn't be larger than 30 - 50 % of the yield limit. The hypothesis H | ||
| 2. |
Biloborodchenko V. Investigation of Magnetically Controlled Electric Arc [Електронний ресурс] / V. Biloborodchenko, A. Dzyubyk, A. Zabranskyi // Ukrainian journal of mechanical engineering and materials science. - 2017. - Vol. 3, Num. 2. - С. 55-66. - Режим доступу: http://nbuv.gov.ua/UJRN/ujmems_2017_3_2_9 In this work, the results of pad welding with the circularly rotating arc existing in an inert gas between a circle cathode with the diameter suitable to dimensions and geometry of a welded surface, with the kinematic characteristics of the motion provided (with the rest equal conditions) by the external magnetic field, are considered. It is shown that the strict theory of an electric arc is insufficient for the description of real physical processes occurred in it under the action of external exciting magnetic fields, and so it does not allow conducting satisfactory technological calculations of the parameters of the pad welding process performed by the arc moved by the external magnetic field. The main problem consists in determining the effectiveness and the direction of superposition of electrodynamic and mechanical forces in it, which resist arc interaction with the magnetic field. Therefore, the aim of the work is to investigate the influence of the induction value B of the transvers magnetic field of a solenoid inductor on predicted kinematic characteristics of the arc. The investigations were conducted with the use of experimental equipment (test bench) consisting of a toroidal inductor with a winding. On the inductor, a nonfusible water-cooled ring copper electrode is mounted. Electrode dimensions agree with the diameter of pad surface. The shielding gas is provided through the system of radially located nozzles with discreet valvular operation, whose work priority is agreed with the arc motion velocity by a control unit. Since the values of abovementioned forces directly conditioned by the presence of a magnetic field in an interelectrode gap, the investigation of its intensity by the electrodynamic method with the help of the measuring instrument for magnetic induction ИМИ-1 was carried out. The analysis of the superimposed surface of the impact of the magnetizing current and the arc gap, which are used at pad welding by magnetically controlled arc, on the field induction shows that the range of their influence as technological mode parameters is quite narrow. Accordingly, for optimal choice of model nomographic solutions and the description of the correlation of parameters of the arc gap and magnetizing current, which provide the technologically suitable induction, an experiment was conducted according to the matrix of simplex-summarized C-C | ||
| 3. |
Biloborodchenko V. Design – technological optimization of the level of residual deformations during welding of pipe sections from PT-7M alloy [Електронний ресурс] / V. Biloborodchenko, A. Dzyubyk, L. Dzyubyk // Ukrainian journal of mechanical engineering and materials science. - 2021. - Vol. 7, Num. 1-2. - С. 43-53. - Режим доступу: http://nbuv.gov.ua/UJRN/ujmems_2021_7_1-2_7 | ||
| 4. |
Biloborodchenko V. Optimization of the mechanism welding mode in a shielding gases environment of shell structures in the position "On weight” [Електронний ресурс] / V. Biloborodchenko // Ukrainian journal of mechanical engineering and materials science. - 2022. - Vol. 8, Num. 4. - С. 49-62. - Режим доступу: http://nbuv.gov.ua/UJRN/ujmems_2022_8_4_8 Due to their simplified spatial shape, shell cylindrical designs have acceptable manufacturability. The latter makes it possible to use a variety of fusion welding methods in their manufacture, including the option of mechanized welding in protective gas environments. Such a technological process is considered to be sufficiently developed in terms of theory and application, as evidenced by specialized equipment for it and numerous recommendations for the selection of installation and running welding parameters. Analysis of such material demonstrates that the basic technology is welding in the lower position with a seam root lining or with the use of a suitable technological arrangement for rotating large structures to provide such conditions. Much more difficult to meet the quality requirements for a welded joint are repair and welding works of non-rotating structures with a one-sided approach to the welding zone and the absence of a seam root lining. In this case, welding equipment with electric or electric-mechanical control of the process of dropwise transfer of metal into the bath is used, regardless of the spatial position of the seam. However, in cases of single production or repair welding, classical welding sources are still widely used, in which the regulatory requirements for the weld are provided by its appropriate external characteristics, the effect of self-regulation of the arc and dynamic characteristics. Here, the variant of droplet transfer with a short circuit of the droplet to the bath is typical, with the characteristic instability of energy accumulation/return of the source choke at the stages of the arc and droplet and the corresponding behavior of the arc in different spatial positions. Since the parameters of the mode are interdependent and, thus, welding itself represents a poorly organized system that has a variety of physical parameters that cause different in nature, but tightly interconnected processes in the zone of weld formation. The best tool for assessing the condition and regulation of such a system today is planning an experiment with independent controlled (setting) parameters of the welding mode and quality feedback - the optimized amount of weld penetration. On the basis of the processing of the array of recommended data regarding the selection of the value of the setting parameters of the welding process by the procedure of constructing symmetric histograms and the distribution polygon and calculating the analytical model of the description of the distribution density for each setting parameter of the process, their average values are set with a probability of 0,9. The latter were used to calculate the actual values of the following parameters for welding a given material thickness - electrode wire diameter 1,6 mm, welding current 190 A, voltage 25 +- 1 V, welding speed - 26 - 42 m/h, wire feed speed 21 - 29 m/h, electrode discharge wire 16 mm. On the basis of the specified reference base of parameter values, a planned experiment was set up and implemented to find the optimum on a matrix of a composite symmetrical three-level plan, as variable factors are set - process voltage, welding wire feed speed and welding speed; the height of penetration of the assembled parts is set by the response. The region of the optimum and the influence of the setting parameters of the mode on it, as well as the analysis of its response surfaces and cross sections of such surfaces demonstrate that the setting parameter - the source voltage should practically be constant at the level of 24 V and does not have a significant adjustment ability for the correction of the welding mode. The setting kinematic parameters of the mode are the wire feed speed and the welding speed, respectively 23 and 27 m/h, at the given arc voltage, they provide welding in one pass. In terms of the depth of the ability to adjust the quality of the seam formation, the welding speed prevails, since, all other things being equal, the wire feed speed is strictly correlated with the speed of its melting at a given diameter and electrode distance. The latter determine the actual value of the current, the value of which is limited by the source voltage, which is strictly specified and constant for the given process under study. | ||
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