The Paton Welding Journal, 2013, №07



2013 №07 (02)

2013 №07 (04)

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The Paton Welding Journal, 2013, #7, 13-23 pages

MODELLING OF DYNAMIC CHARACTERISTICS OF A PULSED ARC WITH REFRACTORY CATHODE

I.V. KRIVTSUN, I.V. KRIKENT and V.F. DEMCHENKO

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua


Abstract
Self-consistent model of non-stationary processes of transfer of energy, pulse, mass and charge in the column and anode region of electric arc with refractory cathode was the basis to perform a detailed numerical analysis of dynamic characteristics for atmospheric-pressure argon arc with tungsten cathode and water copper-cooled anode at pulsed variation of electric current. An essential difference in dynamic behaviour of local and integral characteristics of arc plasma is shown, as well as the specifics of dynamics of thermal and electromagnetic processes running in the pulsed arc column and anode region. It is established that the velocities of transient processes in arc plasma at the pulse leading and trailing edges can also differ significantly. 28 Ref., 14 Figures.


Keywords: pulsed electric arc, refractory cathode, water-cooled anode, arc column, anode region, current pulse, dynamic characteristics, mathematical modelling


Received:                18.06.13
Published:                28.07.13


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