2018 Everlast PowerTIG 210EXT 210amp Ac Dc Tig Stick Advance Pulse Welder 110/220 Volt Inverter-based IGBT Technology Microprocessor control offers precise management of welding parameters and functions 3 types of wave form for AC welding: Sine Wave, Advanced Square Wave, and Soft Square Wave programmable Stick functions which include hot start time, hot start intensity and arc force control IGBT TECHNOLOGY - standard type pulse feature for AC and DC, and a special Advanced Pulse for AC Ideal for generator use with a Power Factor Correction (PFC) of greater than 99-Percent