Magnetic Particle Inspection of Circumferential Defects Internal Surface of Cylindrical Part

In view of the low sensitivity and leakiness in the traditional electromagnetic coil inspection of internal surface of cylindrical part,this article briefly reviews the insufficiency of electromagnetic coil inspection,vertical current flow method,one coil magnetization induced current method and yoke method.Therefore,the appropriate methods applicable for detecting circumferential defects of cylindrical parts by using double coil induction current were proposed,which could better solve this kind of problem.