... .high efficiency 3.high duty cycle dc inverter arc argon welding equipment TIG-250:1.Use: widely used instruments, decoration, hardware, small ... control system to ensure the machine is stable; 5.Excellent welding performance:(1), gas adjustable delay 0-10S, save gas and ... , overvoltage, overheating, over current, overload, phase auto-protection to ensure welding safety, reliability and durability;