Abstract: Briefed here in article are the operation principle,the manufacturing process and the inspection process flow of the ERW induction welded pipe.Also analyzed in detail are the key factors that influence the seam joint quality of the said pipe.As a result,it is identified that the seam quality of the pipe is significantly influenced by the raw material quality,and the qualities of the pipe manufacturing operation steps,including formation,welding,heat treatment and so on.Furthermore,the seam welding quality of the pipe is also directly influenced by certain key control parameters of the welding process such as input heat amount,extruding force,opening angle,welding speed,and locations of the induction coil and the impedance transformer,etc.