Carbon steel welded pipe is a common metal welding products, is the use of hot and cold rolled sheet coil or steel strip after forming and welding into a pipe a steel pipe. According to different forming methods and welding methods, carbon steel welded pipe can be divided into straight seam welded pipe and spiral welded pipe two types. Usually used to transport gas, liquid, solid powder or bulk materials. It is widely used in petrochemical, fertilizer, ship manufacturing, automobile manufacturing, water conservancy engineering, power transmission and distribution, building decoration and other fields.