This serles of welding machine is manufactured with advanced dual inverter type technology, LGBT power switching component and PWM electronic control technology. Lt has the following advantages; Constant current output; High welding quality; Beautiful welding seams; Good arc dynamic characteristics; Self-compensation capability of network voltage fluctuation; Low power loss; High power factor and no nolse etc. With complete protection function if works reliable can be used for six purposes; DC argon arc welding, DC pulse argon arc welding, AC argon arc welding, AC pulse argon arc welding, DC manual welding and AC manual welding With abundant welding functions, high quality TLG welding can be carried out. Lt has been widely used for the welding of metals such as stainless steel, aluminum, carbon steel, alloy steel, copper and titanium etc.