... technology With PWM pulse width modulation technology HF arc starting CE TIG/MMA WeldingFEATURES:♦Adopt advanced MOSFET technology,energy-saving ... .♦Two functions of TIG/MMA,economic and practical .♦With PWM pulse width ... steel,stainless steel,alloy steel and copper."♦Accessories: TIG torch,electrode holder,earth clamp,brush/hammer,protective mask ...