... . 3.CONTROLLED BY ELECTRONIC REACTOR,WELDING PERFORMANCE IS STABLE,LITTLE SPATTER,DEEP WELDING PENETRATION,GOOD WELDING BEAD. 4.SLOW WIRE FEEDING DURING ARC STARTING ... FORM THE POWER SOURCE,WHICH ENLARGES THE WELDING OPERATION SCOPE. 8.SMALL SIZE,LIGHT WEIGHT,EASY OPERATION,ECONOMICAL AND PRACTICAL. NB SERIES WELDING MACHINE