pipe prefabrication automatic welding machine is specially designed and manufactured for the purpose of meeting the requirements of enhancing productivity, increasing the extent of automatic, reducing welder’s working intensity and adapting to piping workshop prefabrication. The welding head will be relatively fixed, while the piping spool piece revolving at a specific rate, and the high efficient and low cost shielded welding or SAW process is adopted, so it has the features of easy-operation, reliable-performance and wide-application field.