NB-KR Series Thyristor Control Gas-Shielded Welding Machine NB-350KR NB-500KR 1. New designer, effective for preventing dust 2.Easily operate 3.Separated station construction, mainly consist of welding source, wire feeder, welding torch. 4. Voltage fluctuated compensation function 5.Suitable for welding carbon steel, low alloy steel and stainless steel.