|SCIENTIFIC AND TECHNICAL
|Ishchenko A.Ya., Falchenko Yu.V., Ustinov A.I., Movchan B.A., Kharchenko G.K., Muravejnik A.N., Melnichenko T.V. and Rudenko A.E. Diffusion welding of finely-dispersed AMg5/27% Al2O3 composite with application of nanolayered Ni/Al foil
|It is shown that the presence of an interlayer between the surfaces being joined leads to formation of a strong (about 70 % of strength of the base metal) welded joint with no change in uniformity of distribution of the reinforcing particles (Al2O3). An activating effect of the interlayer on the process of diffusion welding is provided by the reaction of synthesis to form the NiAl3 intermetallic phase within the joint zone, the phase being fragmented and dissolved in the composite matrix phase under the conditions of heating under pressure.
|Lobanov L.M., Pashchin N.A., Loginov V.P. and Smilenko V.N. Effect of electrodynamic treatment on stressed state of welded joints on steel St3
|The effect of electrodynamic treatment (EDT) with electric current pulses on the stressed state of low-carbon steel St3 and its butt welded joints was investigated. The experimental procedure was developed to study the mechanism of a discrete drop of the loading force on flat specimens under a single electrodynamic impact. EDT of butt welded joints on steel St3 was found to provide a more than 50 % decrease in the level of residual welding stresses.
|Skuba T.G. Spatial model of welded butt joint based on the data of triangulation optical sensor
|The paper deals with the problem of construction of a spatial model of butt joint by the data obtained from triangulation optical sensor. Obtained work results can be used in systems of adaptive control of the process of arc welding of sheet structures 30Д50 mm thick in different positions.
|Royanov V.A. and Korostashevsky P.V. Selection of parameters of the roller field of the line of sheet panel assembly and welding
|Dependence of deflection of sheet panel ends at transportation over the roller field on the extension of a free hanging end, distance between the neighbouring rows of rollers, material properties and sheet thickness was established. Schemes were developed for selection of roller spacing and distance between the neighbouring rows of rollers of the roller field for transportation of panels from sheets of different thickness and different materials.
|Paton B.E., Yushchenko K.A., Lychko I.I., Kovalyov V.D., Veliky S.I., Pritula S.I., Chepurnoj A.D., Nikitchenko S.P. and Shalashny A.N. Equipment, procedures and technology for electroslag welding of position circumferential butt joints
|The paper considers features of equipment and technology for electroslag welding of position circumferential butt joints on supporting rings of oxygen-blown vessels using the Ash 115 M machine at the Company «Azovmash». Described are advantages of the new machine that provides a high technical level of the technology and cost effectiveness of fabrication of large-size welded metal structures.
|Kirian V.I., Knysh V.V. and Kuzmenko A.Z. Extension of the life of metal span structures of railway bridges with fatigue damage
|Considered are the features of early accumulation of fatigue damage, initiation and development of fatigue cracks in welded components of metal span structures of railway bridges. A high effectiveness of application of high-frequency mechanical peening (HFMP) for extension of residual life of welded joints after accumulation of considerable damage in them, including development of cracks up to 1 mm deep, was established. Methods of retardation have been studied for propagating cracks, and the most efficient of them have been determined, namely inducing compressive residual stresses in the fatigue crack propagation path by applying local heating of the metal; placing a high-strength bolt in the drilled-out hole near the crack tip; repair of the metal zone damaged by the fatigue crack using welding with HFMP.
|Ilyushenko V.M., Voropaj N.M. and Polyakov V.A. Technological features of the processes of automated arc welding in repair of large-sized tanks
|Comparative analysis has been performed of the processes of automated gas-shielded, self-shielded flux-cored wire arc and submerged-arc welding for repair of metal structures of large-sized tanks. Considered are the technological features of performance of various types of welds, as well as principles of development of specialized site welding machines. Experience of and prospects for application of new developments are described.
|Demchenko E.L. and Vasiliev D.V. Effect of structural-phase state of high-strength weld metal on properties of welded joints in hardening steels
|It is established that the high-strength (st У 1000 MPa) austenitic-martensitic weld metal has a positive effect on the kinetics of formation of structure and properties of HAZ of the welded joints in alloyed steels made without preheating and postweld heat treatment. Offered is the composition for the high-strength weld metal using flux-cored wire welding, which provides high cold crack and delayed fracture resistance of the welded joints.
|Salnikov A.S., Otrokov V.V., Shelenkov G.M., Tsymbal E.A. and Laktionov M.A. Application of corrision-resistant surfacing in technological equipment operating in contact with sea water
|The results are given on comparative testing of anticorrosion deposits used for protection of power generation equipment operating in sea water. KhN65MV (EP-567) alloy has the highest pitting corrosion resistance in sea water. As to tribotechnical parameters, KhN65MV alloy in contact with FUT coal-plastic is inferior to FUT + bronze pair. KhN65MV alloy can be recommended for protection from pitting and contact corrosion of low-load components operating under the conditions of their wetting by sea water.
|Chajka N.K. Block of bias and cathode power of electron beam gun using inverter-type converters
|The paper deals with the approach to application of inverter-type converters for powering the cathode and forming the control voltage of electron beam guns to reduce the overall dimensions of the block of bias and power of the cathode. This enables neutralizing the negative impact of leakage inductance of high-potential transformer, which increases with introduction of insulation between the windings to ensure the potential decoupling.
|Theses for scientific degree
|International conference «Ti-2007 in CIS»
|Railway transport. Welding 2007 (Workshop in Kakhovka)
|M.L. Zhadkevich is 70
|Developed at PWI