... continue working Professional industry IGBT MODULE welder-MMA-400M Difference compare to normal IGBT machine:1.IGBT MODULE used2.so easy structure ... Pulse Width Modulator, closed loop control system to ensure the machine is stable4.Excellent welding performance: little spatter, arc stability, ... request of CE, 3C, ROHS, stable to use; each machine paseed the test like shaking, old age, high low voltage ...