Development of Digital Gas Metal Arc Welding System and Welding Current Control Using Self-tuning Fuzzy PID

doi:2011.25.6.1

J. Ocean Eng. Technol. > Volume 25(6); 2011 > Article

J. Ocean Eng. Technol. 2011;25(6):1-8.
DOI: https://doi.org/10.5574/KSOE.2011.25.6.001

Doan Phuc Thinh,Pratama Pandu Sandi,Kim Suk-Yoel,Kim Hak-Kyeong,Yeun Hwang-Yeong,Byun Gi-Sig,Kim Sang-Bong

Department of Mechanical Eng. College of Eng. Pukyong National University,Department of Mechanical Eng. College of Eng. Pukyong National University,Department of Mechanical Eng. College of Eng. Pukyong National University,Department of Mechanical En

Keywords: GMAW, Gas Metal Arc Welding, Fuzzy, PID controller

Abstract

This paper describes a new method for a digital gas metal arc welding (GMAW) system. The GMAW system is an arc welding process that incorporates the GMAW power source (PS-GMAW) with a wire feed unit (WFU). The PS-GMAW requires an electric power of constant voltage. A constant magnitude is maintained for the arc current by controlling the wire-feed speed of the WFU. A mathematical model is derived, and a self-tuning fuzzy proportional-integral-derivative (PID) controller is designed and applied to control the welding current. The electrode wire feeding mechanism with this controller is driven by a DC motor, which can compensate for both the molten part of the electrode and undesirable fluctuations in the arc length during the welding process. By accurately maintaining the output welding current and welding voltage at constant values during the welding process, excellent welding results can be obtained. Simulation and experimental results are shown to prove the effectiveness of the proposed controller.