Print

2017 №06 (05) DOI of Article
10.15407/tpwj2017.06.06
2017 №06 (07)


The Paton Welding Journal, 2017, #5-6, 31-33 pages
 

Stabilization of welding current of resistance spot welding machines at mains voltage fluctuations

Yu.N. Lankin, V.F. Semikin and E.N. Bajshtruk


E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
The paper deals with the approaches to development of open-loop systems of welding current stabilization in resistance spot welding machines at mains voltage fluctuations. A microcontroller regulator of resistance welding is described, which provides automatic determination of the initial angle between full-phase current and voltage of the machine, as well as welding current stabilization at mains voltage fluctuations. System of angle determination and current stabilization is implemented as finite state machine with digital model of the object of control, presented in the tabulated form. This enabled application of a simple general purpose eight-bit microcontroller for the regulator. 7 Ref., 1 Figure.
 
Keywords: stabilization, welding current, mains voltage, resistance welding
 
 
Received:                26.04.17
Published:               06.07.17
 
 
References
  1. Lankin, Yu.N. (1961) Control circuit of ignitron breaker with automatic stabilizing of current. Svarka, 4, 25–27.
  2. Lankin, Yu.N., Masalov, Yu.A. (1972) Control circuit of valve breaker. USSR author’s cert. 349523. Int. Cl. B 23k 11/24.
  3. Nikulin, V.N. (1963) Program control systems with self-correction based on digital devices. Svarka, 5, 28–33.
  4. Nikulin, V.N. (1967) Development and investigation of program control system with self-correction for automation of resistance spot welding process: Syn. of Thesis for Cand. of Techn. Sci. Degree. Kiev: PWI.
  5. Akselrod, F.A., Ibragimov, U.U., Ioffe, Yu.E. et al. (1987) Method of stabilizing of welding current in resistance welding with thyristor control. USSR author’s cert. 1355409. Int. Cl. B 23 K 11/24.
  6. Akselrod, F.A., Ibragimov, U.U., Ioffe, Yu.E. et al. (1987) Method of determination of power coefficient of full-phase current switching-on in resistance spot welding with single-phase current. USSR author’s cert. 1381358. Int. Cl. B 23 K 11/24.
  7. Podola, N.V., Rudenko, P.M., Gavrish, V.S. et al. (1986) Method of measuring of power coefficient of single-phase resistance welding machine. USSR author’s cert. 1310149. Int. Cl. B 23 K 11/24.