... , CNCEC, etc.Automatic Root Pass, Fill and Cap Pass Welding Machine; automatic pipe welding machine; piping Welding efficiency ... : 280-500D.I/8 Automatic Root Pass, Fill and Cap Pass Welding Machine; automatic pipe welding machine; piping Features: 1Realize automatic Pipe ... 280-500D. I/8hrs3Speed of automatic MIG root pass: 180-200mm/ ...