Development of Digital controlled SCR type CO<sub>2</sub> Welding System for Implementation Pulse Output

Eun, Jong-Mok; Choe, Gyu-Ha

doi:2014.32.1.102

J Weld Join > Volume 32(1); 2014 > Article

Research Paper

Journal of Welding and Joining 2014;32(1):102-107.
DOI: https://doi.org/10.5781/JWJ.2014.32.1.102 Published online February 27, 2014.

Development of Digital controlled SCR type CO₂ Welding System for Implementation Pulse Output

Jong-Mok Eun^*, Gyu-Ha Choe^**

Correspondence: Jong-Mok Eun,
Email: powwel@powwel.com

Abstract

SCR(Thyristor) type CO₂ welders have widely used for the welding process of heavy industries such as shipbuilding and plant. Since the industrial fields of shipbuilding and plant are usually exposed to severe welding condition with lots of dust, extreme temperature, high humidity and vibration, it is not recommended to use inverter type welder despite its state-of-the-art technology. Many sophisticated functions in the inverter welder may not work due to malfunction of its sensitive components. Hence this study focused on digitalization of SCR CO₂ welder by making use of microprocessor for SCR phase control. By this application, fine control of output of the CO₂ welding systems is achieved. Also pulse output mode of operation is realized and its verification is carried out with aluminum sample welding. The experimental results showed sound weld bead. The front operation panel provide user with numerical parameter settings and monitors. It will help precise weld process monitoring and control with digital value.

Key Words: CO₂ Welding, SCR, Microprocessor, ASIC, Phase control, Pulse output