Research On Technology Of Alternative Current Magnetic Field Leakage And Flaw Identification To The Whorl

The alternating current in the alternating current magnetic field leakage testing (AC- MFL)is one of the magnetizing manners. The sensitivity is very high to the defect of surface and the near to the surface of the workpiece. It is one of the developing directions of nondestructive testing (NDT) domain. The attachments of whorl are all over the world in the trade and department of national economy. Their safety is closely touch to the safety of facilities and the people. An effectively means not only generates large economy efficacy, but also has important meaning. The main research and technical innovation following this:It primarily researched the technology of AC- MFL in our country. The approximation analysis result of band dipole model is obtained on the basis of the theory of MFL. The electromagnetic distribution feature of the defect in the steel panel is studied by means of simulation .The leakage magnetic distribution of the two defects and four defects plural and the defects in the column differently in the width are also assayed. Conclusions that factors affecting flaw magnetic leakage to the panel also affect the column and magnetic leakage bx should be the feature of the flaw identification to several flaws are drawn. The system scheme for testing is build up. And the result of testing goes alone with the theory and the simulation analysis.It is looked on the attachment of whorl as several flaws in the column. On the basis of the result studied, three categories flaws easily turning up in the common whorl attachment are assayed by way of simulation .The result of experimental measurement verify all the conclusion from FEM numerical simulation analysis。Based on the study of the rationale of the AC- MFL, it primarily simulation studied the common whorl attachment in our country. The experimentation results go along with the simulation analysis.