Pipeline,as a mode of energy transportation,is often corroded due to the complex internal media.It is an effective method to evaluate the operation condition of pipeline by carrying out magnetic flux leakage(MFL)inspection.The research project bases on the internal testing of pipeline magnetic leakage,adopts the finite element analysis method to study the spatial distribution characteristics of the leakage magnetic field of pipeline defects,welds,flanges,patches and pipe connection,extracts the key characteristic parameters of the leakage magnetic field of defects,analyzes the spatial distribution law of the leakage magnetic field of defects,and provides a theoretical basis for the identification of defect signals.
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