Abstract
Proposed Inspection Method for Opposite-side Defect in Steel Plate Using Synthetic Magnetic Field with High and Low Excitation Frequencies
Highlights
Electromagnetic inspection, ultrasonic inspection, and so forth are applied for the maintenance inspection of petrochemical plants
In this research, a steel plate with a thickness of 2 mm is examined assuming a large-diameter steel pipe. This method is investigated by a 3D nonlinear finite element method (FEM), taking account of the minor loop magnetism property in the steel plate, and a verification experiment is performed
The results obtained by this research are summarized as follows: [1] An opposite-side defect in a thin steel plate is detected by a synthetic magnetic field consisting of a large magnetic field with a low frequency and a minute magnetic field with a high frequency
Summary
Electromagnetic inspection, ultrasonic inspection, and so forth are applied for the maintenance inspection of petrochemical plants. An electromagnetic inspection method capable of high-speed inspection is required for defect inspection on the opposite side of a large-diameter steel pipe with a thickness of about 2 mm in such plants. For this inspection, an electromagnetic inspection method using a large static magnetic field and a minute AC magnetic field is being studied.[1,2,3,4] in this inspection method, a degaussing process is needed since large residual magnetism is generated inside the steel plate during the inspection.[5]. This method is investigated by a 3D nonlinear finite element method (FEM), taking account of the minor loop magnetism property in the steel plate, and a verification experiment is performed
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