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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. Source

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. Source

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. Source

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. Source

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. Source

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