... Welding Machine 1) Welding efficiency: 280-500D. I/8hrs. Automatic Root Pass, Fill and Cap Pass Welding MachineSuitable for industries of ... , CNPC, SINOPEC, CNOOC, CNCEC, etc.Features:1, Realize automatic Pipe root pass, fill and cap pass, when integrated with mature welding ... efficiency: 280-500D. I/8hrs.3, Speed of automatic MIG root pass: 180-200mm/min4, Satisfy requirenments for nuclear-level, high ...