... Automatic root/fill/cap pass Automatic Small Pipe Welding Station (1"-8"); Automatic Pipe Welder; Automatuc Pipe Welding Machine; ... CNPC, SINOPEC, CNOOC, CNCEC, etc.Automatic small pipe welding station consists of welding manipulator, elbow welding machine, power source, ... first X-ray test. Automatic Small Pipe Welding Station (1"-8"); Automatic Pipe Welder; Automatuc Pipe Welding Machine