AUTO-TIG ROOT-PASS ROOT-PASS EFFECT BY AUTO-TIG NAEC---- Minimize the outdoor work, Maxmize customer's profit!Suitable for industries of: OIL AND GAS, REFINERY FACILITIES, OFFSHORE &SHIPBUILDING, POWER PLANT, ETCReference: CCC, L&T, PEC, Rotary Engineering, Petrol Steel, JSL, CNPC, SINOPEC, CNOOC, CNCEC, etc.Automatic Root Pass, Fill and Cap Pass Welding Machine; automatic pipe welding machine; ...