A Dynamics Study of a Magnetic Flux Leakage(MFL) Signal and its Application to Defect Location Discrimination in Steel Pipes MFL Testing Equipment

作     者：KANG Yi-hua LI Jiu-zheng WU Xin-jun 

作者机构：School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China 

出 版 物：《International Journal of Plant Engineering and Management》 (国际设备工程与管理（英文版）)

年 卷 期：2009年第14卷第2期

页      面：70-77页

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Natural Science Foundation of China under Grant No.50675083 

主　　题：nondestructive testing magnetic flux leakage steel pipes internal defects 

摘      要：Difference processing was used to the direct current magnetic flux leakage （DC-MFL） signal, emanating from the defects machined artificially on the internal and external surfaces of a steel pipe. Consequently, the loea-tion discriminating index 8 was provided to identify the defect whether it is on the internal surface or the external one. Three characteristics, shape, depth and orientation of the defect, were discussed through a series of experiments on the artificial defects, such as transverse notches, oblique notches and pits on the steel pipe. The approach has been verified effective to address the defect location identifying problem, albeit the limits on the accuracy assessment to those natural defects on steel pipes in service.