On current control method for single-phase AC resistance spot welding

Author

Kang Zhou ; Lilong Cai

Author_Institution

Dept. of Mech. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China

fYear

2012

fDate

9-12 Dec. 2012

Firstpage

857

Lastpage

860

Abstract

The paper deals with the constant current control for single-phase AC resistance spot welding (RSW), which is the most commonly used control strategy in modern welding industry. The process of RSW is nonlinear and time-varying. After analyzing the working principle and nonlinear properties of RSW, a mathematical relation between input and output variables for constant current control is developed. A PI controller, which is used to regulate the desired current used in the mathematical relation, is employed to improve the performance. The final experimental results showed the performance obtained by new controller was better than that by a fine-tuned PID controller.

Keywords

PI control; control system synthesis; electric current control; mathematical analysis; nonlinear control systems; spot welding; three-term control; time-varying systems; PI controller; RSW nonlinear properties; control strategy; current control method; fine-tuned PID controller; mathematical relation; nonlinear process; single-phase AC resistance spot welding; time-varying process; welding industry; working principle; Coils; Current control; Equations; Firing; Resistance; Spot welding;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems (ICECS), 2012 19th IEEE International Conference on

Conference_Location

Seville

Print_ISBN

978-1-4673-1261-5

Electronic_ISBN

978-1-4673-1259-2

Type

conf

DOI

10.1109/ICECS.2012.6463617

Filename

6463617