Advanced IGBT inverter technology, high efficiency, energy-saving, and less noise. Optimized IGBT tubes and radiator design, quick heat dissipation long life. With manual-adjust Hot-start and Arc-force current, arc-rise power Free-control, easy-to-control melting depth, and small-current Welding, ensure the seam is formed nicely. Capable of lengthening cable with less current damping. With O.C&O.H protection, VRD, ANTI-STICK, LIFT TIG functions.