... circumferential welding or longitudinally welded Automatic pipe fabrication machine Welding Machine (Cantilever Type) Automatic Pipe Welding Machine/ Pipe Welding Equipment Model No.: AWM ... weight to offset large bending moment caused by elbows for large diameter pipe, or providing a chain ... butt welding lines of spool pieces such as pipe-pipe, pipe-elbow, pipe-flange, flange-flange and flange-elbow, ...