... of basic acidity, 2.widely used 3.high efficiency DC IGBT welding machine:♥ Uses high-power V-MOS pipe, hign rate power ... utlization, low no-load loss, good welding quanlity.♥ Compact, light and portable, suitable for moving, going out ... of over-voltage,over current,over-heat.♥ Suit for welding kinds of basic acidity, alkalescence welding rods, support cellulose rod downwarding ...