... pass 2)With two welding heads Automatic Small Pipe Welding Station (1"-8")Suitable for industries of: OIL AND GAS, REFINERY ... Steel, CNPC, SINOPEC, CNOOC, CNCEC, etc.Automatic small pipe welding station consists of welding manipulator, elbow welding machine, power source, self ... . It is able to realize automatic pipe welding completely.Features:1. Automatic root pass, fill, and cap pass2. With two ...