The Paton Welding Journal, 2014, №08



2014 №08 (06)

DOI of Article 10.15407/tpwj2014.08.07

2014 №08 (08)

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The Paton Welding Journal, 2014, #8, 42-46 pages  

INSTABILITY OF MODE IN CIRCUIT WITH CAPACITY AND ELECTRIC ARC SUPPLIED BY DIRECT CURRENT SOURCE

E.N. VERESHCHAGO and V.I. KOSTYUCHENKO

Admiral Makarov National Shipbuilding University. 9 Geroev Stalingrada Ave., 54025, Nikolaev. E-mail: welding@nuos.edu.ua
 
 
Abstract
Stability and appearance of oscillations in electric arc current were investigated for specific conditions of DC electric circuit. It is indicated that circuit with arc has always parallel to it capacity, formed by unit own capacities. The electric arc as element of electric circuit is described using generalized model, which considers thermal delay of electric arc and does not limit its static volt-ampere characteristic. Considered is an effect of parameters of electric arc on transfer process, conditions of appearance of continuous and divergent oscillations are obtained. Principle and equivalent schemes of investigated circuit are presented. Dissipative properties of oscillation system are characterized with the help of coefficient of circuit attenuation, specific damping as well as coefficient of energy loss in the system. Suppression frequency, pass band, frequency of own oscillations and dynamic resistance of the circuit are determined. Resistive damping of oscillations is studied, desirable value of damping resistor is determined and results of calculations and modelling are illustrated. Received results can be used in designing and adjustment of new power sources for welding and related technologies as well as estimation of damping and stabilizing of operating power sources. 8 Ref., 4 Figures.
 
 
Keywords: arc welding, electric and plasma arc, stability of process, transfer processes, oscillation damping, calculation and modelling
 
 
Received:                30.05.14
Published:               28.08.14
 
 
References
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