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 ... , Petrol Steel, JSL, CNPC, SINOPEC, CNOOC, CNCEC, etc.Automatic Tank Welding Machine(Bottom to Top);Automatic Tank Welder(Bottom up)Configurations:- AGW for tower and ...