... 2) duty cycle:100% 3) long time continue working Good performance MMA-250T DC inverter welder Use: light manufacturing, ... Advanced inverter technology: Inverter frequency up to 100KHz, conversion rate of 85%, no-load loss, using non-adjustable, easy to ... the machine is stable; Excellent welding performance: dynamic characteristics of a good, little spatter, arc stability, weld pool easy to control ...