基于单线圈斜向磁化的钢管漏磁检测方法

针对目前钢管纵、横向缺陷采用漏磁方法分开检测的不足，依据单线圈磁场特性，提出并分析了基于同轴单线圈、斜置单线圈、辅以聚磁器的斜置单线圈和辅以聚磁器的同轴单线圈的四种钢管磁化方法。得出了单线圈斜置是钢管产生斜向磁化的必要条件，聚磁器能增强斜向磁场的结论。在此结论基础上建立了基于斜向磁化的，可同时检测出纵、横向缺陷的钢管漏磁检测方法。

Magnetic Flux Leakage Inspection Method for Steel Pipe Based on Oblique Magnetization by Single Coil

According to the problems that longitudinal and transverse defects of steel pipe are tested separately by magnetic flux leakage inspection, four methods of magnetization for steel pipe based on coaxial single-coil, oblique single-coil, oblique single-coil with a magnetic component for collecting magnetic field and coaxial single-coil with it were proposed and analysed. It concluded that an oblique single-coil was the necessary conditions for producing oblique magnetic field and the magnetic component could increase it. The conclusion was validated by experiments. Finally, a method of magnetic flux leakage inspection for longitudinal and transverse defects of steel pipe simultaneous detecting based on oblique magnetization by single coil was put forward.