Automatic Tank Welding Machine(Bottom to Top);Automatic Tank Welder(Bottom up) More suitable for tank diameter larger than 30m 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 ...