... cap pass 2)With two welding heads Automatic High-efficient Welding MachineSuitable for industries of: OIL AND GAS, REFINERY FACILITIES, OFFSHORE &SHIPBUILDING, POWER ... , SINOPEC, CNOOC, CNCEC, etc.Automatic small pipe welding station consists of welding manipulator, elbow welding machine, power source, self centering welding ...