With an auto protection function to prevent over-current and over-heating, it makes the machine safe and reliable. Independent self-adaption switching power supply adapts to a voltage range. Perfect constant-current electrical characteristics, with more stable arc welding. Modular functional unit design greatly improves the stability of the machine. Main circuit with full bridge high power IGBT, high reliability. Independently adjustable of pre-flow and post-flow. With 2T/4T mode, it reduces the working intensity greatly. One machine with TIG/MMA welding. Intelligent fan with comprehensive protection. Advanced IGBT inverter technology, high working frequency (50kHz), energy saving, and environmental protection. With a tri-proof design, it ensures working stability and reliability when in kinds of harsh welding conditions Able to weld all kinds of metal : carbon steel, stainless steel, alloy steel, etc.