Heavy-Duty Elbow Welding Machine 1)Welding efficiency: 280-500 D. I/8hrs 2)TIG/MIG/SAW are optional Heavy-Duty Elbow Welding ... CNPC, SINOPEC, CNOOC, CNCEC, etc.Features:1, Welding efficiency: 280-500 D. I/8hrs2, TIG/MIG/SAW are optional, ... & WPS programmed3, Suitable for pipe O. D from 2"-48"4, Max. Weight of elbow is ... 1.5T5, Zero-balance weight patent design, meet ...