Product Overview The NBC-500X / NBC-500A / NBC-500 is an industrial-grade CO₂ gas-shielded welding machine built on a proven IGBT inverter platform with a classic analogue big-board control circuit. Designed for demanding fabrication environments, it delivers stable, reliable performance with comprehensive protection and multi-process capability. Models covered: NBC-500X | NBC-500A | NBC-500 Key Features IGBT inverter with proven analogue control circuit for stable, reliable