The Paton Welding Journal, 2015, №12



2015 №12 (03)

DOI of Article 10.15407/tpwj2015.12.04

2015 №12 (05)

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The Paton Welding Journal, 2015, #12, 19-23 pages
 

On the influence of capacitance in the welding circuit on stability of arc welding mode

G.A. Tsybulkin

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
Profound study of the influence of various kinds of destabilizing factors on welding process stability is one of the main tasks in its robotization. The influence of capacitance («parasitic» or purposefully included into the welding circuit) on stability of the mode of consumable-electrode gas-shielded arc welding was studied in this work. It is shown that at high and medium welding currents, i.e. when the working point is located in the rising or flat section of the arc volt-ampere characteristic, presence of a capacitance in the welding circuit does not affect the stability of steady-state arc welding mode. Now, in the case of small currents, when the working point is located in the falling section of this characteristic, ensuring the arc welding mode stability is possible only at limited values of the above capacitance. Established criteria in the form of algebraic inequalities allow comparatively simple evaluation of the region of this capacitance values, within which stable modes are guaranteed. Results presented in this paper will be useful in development of robotic welding technologies and respective process equipment. 17 Ref., 5 Figures.
 
Keywords: robotic arc welding, consumable electrode, capacitance, steady-state modes, stability, transient processes
 
 
Received:                08.10.15
Published:               21.01.16
 
 
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