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Numerical Analysis of Plasma Characteristics of Constricted and Free-burning Arc with a Refractory Cathode by I.V. Krivtsun; E.O. Paton Electric Welding Institute, NASU; I.V. Krikent; V.F. Demchenko; Dnieprodzerzhinsk State Technical University 2 Dnieprostrojevskaya Str., 51918, Dnieprodzerzhinsk, Ukraine; E.O. Paton Electric Welding Institute, NASU is a Engineering article available to read on EtoBox.

What is Numerical Analysis of Plasma Characteristics of Constricted and Free-burning Arc with a Refractory Cathode about?

Self-consistent mathematical model of the processes of energy-, mass-and electric transfer in the column and anode region of the electric arc with refractory cathode was used as a basis to perform numerical analysis of thermal, electromagnetic and gas-dynamic characteristics of arc plasma for constricted (plasma) and free-burning argon arc with copper water-cooled anode. Results of calculation of characteristics of arc column plasma show that distributions of electric current density, temperature and velocity of constricted arc plasma can greatly differ from the respective distributions for free-burning arc, depending on arc current, plasmatron nozzle channel diameter and plasma gas flow rate. Characteristics of near-anode layer of plasma arc also differ significantly from the respective characteristics of free-burning arc, depending on the above arcing mode parameters. Thus, by varying arc current, plasmatron nozzle channel diameter and plasma gas flow rate, it is possible to effectively control the characteristics of thermal, electromagnetic and, particularly, dynamic impact of the constricted arc on anode metal surface. 13 Ref., 1 Table, 10 Figures. K e y w o r d s : constricted

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Author

I.V. Krivtsun; E.O. Paton Electric Welding Institute, NASU; I.V. Krikent; V.F. Demchenko; Dnieprodzerzhinsk State Technical University 2 Dnieprostrojevskaya Str., 51918, Dnieprodzerzhinsk, Ukraine; E.O. Paton Electric Welding Institute, NASU

Publisher

International Association Welding

Published

2016

Language

EN

Field

Engineering (Physical Sciences)