... 520655*330*560 IGBT ZX7-ST MMA Series IGBT arc welder For power construction, petrochemical construction, pressure vessel, shipbuilding and ... The BX1 series the machine efficiency only this series dc welder efficiency of 50%. 3, Managing electric energy more than ... 50%, quarterly can save a welder. DateZX7-90SZX7-110SZX7-140SZX7-160SZX7-200SZX7-250SZX7-270SZX7-315SZX7-400SZX7 ...