... .high efficiency 3.high duty cycle dc inverter arc argon welding machine TIG/MMA-200:1.Use: widely used instruments, decoration, hardware, ... Modulator, closed loop control system to ensure the machine is stable; 5.Excellent welding performance:(1), gas adjustable delay 0-10S, ... overvoltage, overheating, over current, overload, phase auto-protection to ensure welding safety, reliability and durability;