ARM based full digital IGBT inverter power supply for fine waveform control of short-circuit CO2 arc welding

A high performance digital power supply for CO₂ arc welding based on IGBT inverter and ARM controller is developed, which can output current and voltage parameters according to the different states during welding process. Experimental results proved that fine waveform controls of various stages such as initial short-circuit, liquid bridge transfer, pinch and arc burning are effective and welding quality is improved. The system is a fully digitized one and posses the capability of further upgrading and enhancement.