GIRTH SEAM WELDING EFFECT GIRTH SEAM WELDING EFFECT BY AUTOMATIC GIRTH SEAM WELDING MACHINE NAEC---- Minimize the outdoor work, Maxmize customer's ... , L&T, PEC, Rotary Engineering, Petrol Steel, JSL, ETC.Automatic Girth Seam Welding Machine 1) It is positive 2) Single side ... to-top and top-to-bottom tank erection 2Adopting Sub Arc Welding technology 3 Standard machine suitable for shell plate width1. ...