A new eddy current testing method and its testing effect
WANG Bo1, HU Chong1, WANG Jie2, WANG Yue-yu3, LI Ning4
1. Department of Mechanical and Electrical, Yuncheng University, Yuncheng 044000, Shanxi, China; 2. Metallurgical Technology Institute, Central Iron and Steel Research Institute, Beijing 100081, China; 3. Library Department, Yuncheng University, Yuncheng 044000, Shanxi, China; 4. Department of Mechanical, Baotou Railway Vocational and Technical College, Baotou 010010, Nei Mongol, China
Abstract：The Eddy Current Testing (ECT) method is one of the most commonly used nondestructive testing method for defect detection of metal materials. In this paper, a new ECT method was proposed for improving the shortcomings of the traditional ECT method, which is difficult to miniaturize. The excitation and testing coil of the traditional ECT method were replaced by a small permanent magnet and a high-precision magnetic sensor, respectively. The principle and testing effect of the new ECT method were investigated by using experimental and numerical simulation method. The results show that the principle of the new ECT method is feasible, the device is simple and the testing accuracy is higher. Defects with diameter of 50 μm could be detected under the present paper. The component of the induced magnetic field in the direction of conductor movement and the magnetization direction of the permanent magnet exhibited symmetric negative pulse and sinusoidal changes, respectively. The optimal moving velocity of conductor and lift-off distance should be several m/s and 0.2 mm.
王勃, 胡冲, 王杰, 王月宇, 李宁. 一种新型涡流检测法及其检测效果[J]. 中国冶金, 2021, 31(2): 50-54.
WANG Bo, HU Chong, WANG Jie, WANG Yue-yu, LI Ning. A new eddy current testing method and its testing effect[J]. China Metallurgy, 2021, 31(2): 50-54.
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2021, Vol. 31 
