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Pentegov I.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Sydorets V.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Bondarenko I.,Donbas State Technical University | Bondarenko O.,Kharkiv Polytechnic Institute | Safronov P.,Polytechnic University of Mozambique
Proceedings - 2015 16th International Conference on Computational Problems of Electrical Engineering, CPEE 2015 | Year: 2015

The appearing of supercapacitor internal resistance influence on efficiency of energy delivery in resistance welding circuit was studied in the paper. The dependencies of supercapacitor energy storage efficiency on load resistance were obtained. The limits of supercapacitor use for resistance welding area were determined. © 2015 Lviv Polytechnic National University. Source


Fedorchuk V.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Falchenko I.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine
Applied Mechanics and Materials | Year: 2014

Structural transformations and formation of chemical inhomogeneity in the weld and HAZ metal in fusion welding of complex alloy of V96 type were studied. It is shown that under the influence of welding heat, partial melting of the alloy phase components proceeds in the heataffected zone with formation of structures of eutectic origin in the form of extended interlayers along the grain boundaries, causing metal embrittlement. Scandium addition to the alloy enables reducing the solidification processes and degree of segregation along the grain boundaries, as well as localizing partial melting of the grains without formation of coarse eutectic interlayers. © (2014) Trans Tech Publications, Switzerland. Source


Sydorets V.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Bushma O.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine
Proceedings - 2015 16th International Conference on Computational Problems of Electrical Engineering, CPEE 2015 | Year: 2015

Special techniques have been developed and bifurcation processes in nonlinear circuit with laser-Arc discharge and inertial feedback was investigated. It was found that Hopf bifurcation can be both supercritical and subcritical. The boundary between the two types of bifurcation has been found. The interaction of Hopf bifurcation with other ones (the bifurcation of the twin limit cycle and bifurcation of saddle separatrix) was described. © 2015 Lviv Polytechnic National University. Source


Gulyaev I.P.,RAS Institute of Theoretical and Applied Mechanics | Dolmatov A.V.,Yugra State University | Kharlamov M.Y.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Gulyaev P.Y.,Yugra State University | And 4 more authors.
Journal of Thermal Spray Technology | Year: 2015

In the present paper, we report on the results of an experimental study of heat- and mass-transfer processes in a Plazer 30-PL-W plasma-jet facility used for arc-plasma wire spraying. Using an original optical diagnostic system, we have studied melting behavior of the metal wire, break up and atomization of liquid metal. For the first time, experimental data on the in-flight velocity and temperature of spray particles in arc-plasma wire spraying were obtained. In spite of moderate particle velocities (about 50 m/s), the obtained steel coatings proved to have a low porosity of 1.5%. While studying the spraying process of tungsten wire, we observed the occurrence of anomalous high-velocity (over 4000 m/s) outbursts ejected from the surface of liquid metal droplets. The nature of such outbursts calls for further study. © 2015, ASM International. Source


Berdnikova O.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Sydorets V.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine | Alekseienko T.,Eo Paton Electrical Welding Institute Of The Nas Of Ukraine
Applied Mechanics and Materials | Year: 2014

Presented are the results of investigations of peculiarities of structure formation and phase composition in a metal of laser-welded joints from high-strength steel 14KhGN2MDAFB. The analytical evaluations of strengthening along a welding zone and crack nucleation stresses in the places of stress concentrators determined using the experimental data that a structure being formed provides for uniform level of mechanical properties and crack resistance of the welded joints. © (2014) Trans Tech Publications, Switzerland. Source

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