... in the full current3.Precise control system: PWM Pulse Width Modulator, closed loop control system to ensure the machine is stable4. ... .Improve the protection system: over-voltage, overheating, over-current automatic protection to ensure welding safe6.Weldable materials: electrodes for acidic ... request of CE, 3C, ROHS, stable to use; each machine paseed the test like shaking, old age, high low voltage ...