Automatic Two-Torch Pipe & Flange Welding Machine 1) Two models available: 16" and 16"-36" type 2) ... , Rotary Engineering, Petrol Steel, CNPC, SINOPEC, CNOOC, CNCEC, etc.The machine is able to synchronously weld on inside & outside of flanges ... , CO2 / MIG / SAW are optional3, More than 99% qualified first X-ray test.It has the advantages of easy structure, high welding ...