... -500 D. I/8hrs 2)TIG/MIG/SAW are optional Heavy-Duty Elbow Welding MachineSuitable for industries of: OIL AND GAS, REFINERY FACILITIES ... Engineering, Petrol Steel, CNPC, SINOPEC, CNOOC, CNCEC, etc.Features:1, Welding efficiency: 280-500 D. I/8hrs2, TIG/MIG/SAW are ... patent design, meet X-ray test6, Can be integrated with welding seam preheating system7, More than 99% qualified first X-ray ...