Eo Paton Electrical Welding Institute

Kiev, Ukraine

Eo Paton Electrical Welding Institute

Kiev, Ukraine
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Kartavykh A.V.,National University of Science and Technology "MISIS" | Asnis E.A.,Eo Paton Electrical Welding Institute | Piskun N.V.,Eo Paton Electrical Welding Institute | Statkevich I.I.,Eo Paton Electrical Welding Institute | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

The work is aimed at the study of the formation and refinement of microstructure appearing in the solidifying refractory TiAl-based intermetallics being inoculated with precise boron addition. The novelty of research consists in test application of lanthanum hexaboride (LaB6) ligature within semi-continuous electron beam casting process of selected alloys. Two ingots with nominal compositions Ti-44Al-5Nb-2Cr-1.5Zr-0.4B-0.07La and Ti-44Al-5Nb-1Cr-1.5Zr-1B-0.17La (at.%) have been synthesized and cast along with the reference alloy Ti-44Al-5Nb-3Cr-1.5Zr. Their comparative examination suggests (i) essential microstructural phase refinement effect coupled with (ii) threefold/fourfold decrease of background content of undesirable residual oxygen impurity in both alloys containing LaB6. This advanced dual activity (i-ii) of LaB6 is explained by its complete dissolution, dissociation and following re-precipitation of effective Ti-based monoboride nucleants of orthorhombic B27 structure, those being accompanied by strong internal gettering of dissolved oxygen from the melt and from boride-inoculated solid α2-Ti3Al phase with liberated elemental lanthanum. The phase composition and structure of cast alloys; state and characterization of newly precipitated TiB boride; features of La 2O3 micro/nano-dimensional precipitation and oxygen gettering mechanism are reported and discussed. © 2013 Elsevier B.V. All rights reserved.


Fainberg L.I.,Eo Paton Electrical Welding Institute
Welding International | Year: 2015

The reasons for the asymmetry of the multi-arc welded joints in welding thick-wall gas transmission pipes are investigated and measures are proposed for preventing this defect forming in welded joints. © 2015 Taylor & Francis.


Special features of the formation of the microstructure and the development of chemical heterogeneity in the weld metal and heat-affected zone (HAZ) in arc welding of a complex alloyed alloy of the Al–Zn–Mg–Cu system are discussed. It is shown that the effect of welding heating results in melting of the phase components of the alloy in the HAZ with the formation of structures of the eutectic origin in the form of long interlayers at the boundaries of recrystallized grains, causing brittleness of the metal. Alloying the alloy with scandium reduces the intensity of the processes of recrystallization and the extent of liquation at the grain boundaries and also localizes the melting of the grains without the formation of thick eutectic interlayers. © 2014, © 2014 Taylor & Francis.


Lebedev V.A.,Eo Paton Electrical Welding Institute
Welding International | Year: 2015

New trends in the organization of synergic short-arc welding (with systematic short-circuits) using controlled electrode wire pulsed feed are discussed. Several methods of synergic control of welding processes with controlled short-circuits are proposed. The results of investigations of the new control processes are presented. © 2015, © 2014 Taylor & Francis.


Lebedev V.A.,Eo Paton Electrical Welding Institute
Welding International | Year: 2012

The methods of controlling penetration in mechanized welding and surfacing are analysed. © 2012 Copyright Taylor and Francis Group, LLC.


Fainberg L.I.,Eo Paton Electrical Welding Institute
Welding International | Year: 2012

Investigations were carried out into a number of procedural reasons leading to the differences in the thermal cycles of welding joints produced in large diameter gas transmission pipelines and in laboratory specimens of limited thickness. © 2012 Copyright Taylor and Francis Group, LLC.


Semenov I.L.,Eo Paton Electrical Welding Institute
Ukrainian Journal of Physics | Year: 2013

The problem of calculating the ion drag force acting on a charged macroparticle in collisionless flowing plasma is studied by using an approach based on the direct numerical solution of the Vlasov kinetic equations for plasma components. A uniform plasma flow past a spherical macroparticle is considered. The computations are carried out for different particle sizes and different flow velocities. On the basis of the obtained results the effect of particle size on the ion drag force is analyzed. It is shown that when the particle size is much less than the Debye length in plasma, the ion drag force can be calculated with good accuracy by means of the conventional binary collision approach. A modified version of the binary collision approach is proposed to calculate the ion drag force in the case where the particle size becomes comparable to the Debye length in plasma. It is shown that there is a reasonable agreement between the results obtained using the numerical solution of the kinetic equations and that obtained by the modified binary collision approach. © I.L. SEMENOV, 2013.


Semenov I.L.,Eo Paton Electrical Welding Institute | Zagorodny A.G.,NASU Bogolyubov Institute for Theoretical Physics | Krivtsun I.V.,Eo Paton Electrical Welding Institute
Physics of Plasmas | Year: 2013

The problem of calculating the ion drag force acting on a dust grain immersed in a weakly ionized collisional plasma is studied using an approach based on the direct numerical solution of the Vlasov-Bhatnagar-Gross-Krook kinetic equations. A uniform subthermal flow of argon plasma past a spherical dust grain is considered. The numerical computations are performed for a wide range of plasma pressures. On the basis of the obtained results, the effect of ion-neutral collisions on the ion drag force is analyzed in a wide range of ion collisionality. In the collisionless limit, our results are shown to be in good agreement with the results obtained by the binary collision approach. As the ion collisionality increases, the ion drag force is found to decrease sharply and even become negative, i.e., directed oppositely to the plasma flow. A qualitative explanation of this effect is presented and a comparison of our results with those obtained using the drift diffusion approach is discussed. The velocity dependence of the ion drag force in the highly collisional regime is examined. The relationship between the ion and the neutral drag forces in the highly collisional limit is analyzed and the possibility of a superfluid-like behavior of dust grains is discussed. © 2013 American Institute of Physics.


Fainberg L.I.,Eo Paton Electrical Welding Institute
Welding International | Year: 2013

The optimum phasing of the electrodes and the conditions of four-arc submerged-arc welding of thin wall pipes (6-10 mm), resulting in the height of the convex region and the width of the welded joint not greater than 2.5 and 20 mm, respectively, are determined. © 2013 Copyright Taylor and Francis Group, LLC.


Bernadskiy V.N.,Eo Paton Electrical Welding Institute
Welding International | Year: 2014

Hybrid welding technologies (e.g. laser-arc, laser-plasma, light laser, submerged laser-arc and permanent joints) and their special features and applications are described. © 2013 Taylor & Francis.

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