Advanced Imported IGBT inverter technology, high efficiency, energy saving, and environmental protection. Super strong ability to anti-fluctuate power supply voltage. Under 120-460V the welding power source will have output current and can weld. Suitable for stables welding with extended cables up to 150 meters. With a five-proof design, it ensures working stability and reliability when in kinds of harsh welding circumstances. High-level water-resistant design, the machine can be fully dipped into the water under switch-off conditions. Using PWM control technology and constant current output control, welding current can be exactly controlled. Auto protection functions to prevent over-current and over-heating, it makes the machine safe and reliable. Applicable to acidic, alkaline, high-strength electrode. Intelligent fans add comprehensive protection. Ultra-low output function (VRD), with EU standard to prevent electric shock. 220V/380V(3P) power input automatically changing, nanocrystalline core