Advanced IGBT inverter technology, stable performance, 85% working efficiency, small no-load lose ,easy to use, convenient to carry;2.high duty cycle:100% in normal temperature(means it can continue working for 24 hours without stop), even in the temperature 40, it can arrive to 60% working in the full current3.Precise control system: PWM Pulse Width Modulator, closed loop control system Steeples current Low power consumption Ease of operation and quality weld Welding stainless steel and aluminum System protection from: Overload Overheating Electrode stickingStep less current Low power consumption Ease of operation quality weld Welding stainless steel aluminum System protection fromOverload Overheating Electrode stickingPOWERFULPORTABLE.