The Paton Welding Journal, 2019, №05



2019 №05 (05)

DOI of Article 10.15407/tpwj2019.05.01

2019 №05 (02)

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The Paton Welding Journal, 2019, #5, 2-12 pages
 
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #5, 2019 (May)
Pages 2-12

Effect of current and arc length on characteristics of arc discharge in nonconsumable electrode welding

I.V. Krivtsun, V.F. Demchenko, I.V. Krikent, D.V. Kovalenko and I.V. Kovalenko

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The method of mathematical modeling was used for investigation of the effect of current and length of atmospheric pressure argon arc with refractory (tungsten) cathode on heat, electromagnetic and gas-dynamic characteristics of arc plasma, including the characteristics of its thermal, electric and dynamic (force) impact on the anode surface. A short review of the mathematical models used for this purpose is given. The temperature fields and patterns of current flow in the arc column are illustrated with corresponding isotherms and current lines. Analysis of force effect of arc current on its column plasma is based on calculation data on distribution of magnetic pressure in arc plasma and corresponding magnetic force acting on plasma. Peculiarities of distribution of total pressure and velocity of plasma movement in the arc column are also analyzed. The calculation data are given on distribution of density of electric current and heat flow on the surface of water-cooled and evaporating anode, as well as on distribution of plasma potential along the boundary of anode layer depending on current and arc length. The concepts of effective values of anode and cathode potential drop are introduced. Proceeding from the calculation value of heat flow into the anode and experimental watt-ampere characteristic of an argon arc with a refractory cathode, the data were obtained on the value of effective efficiency of such an arc in the current range of 50–300 A for an arc of 1.5; 2 and 3 mm length. Dependence of the dimensions of current channel and zone of thermal impact of the arc on the anode on current value and arc length was determined. 26 Ref., 22 Figures.
Keywords: arc with refractory cathode, arc current, arc length, arc plasma, arc column, anode layer, anode current density, anode heat flow, mathematical modeling

 
Received: 15.03.19
Published: 30.05.19
 
 

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