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漏磁检测方法作为一种无损检测技术广泛应用于钢材等的检测。分析了脉冲漏磁检测原理,提出了脉冲交流磁化方式。采用有限元法对系统参数变化等影响缺陷漏磁场分布因素进行了仿真计算,分析了提离、缺陷深度及宽度等变化对脉冲漏磁检测结果的影响。结果表明在较大提离情况下,脉冲漏磁检测方法具有可提取较多检测信息、输出电压幅值高的优点,在钢管的缺陷检测中将有广阔的应用前景。
Magnetic flux leakage testing method as a non-destructive testing technology is widely used in steel and other testing. The principle of pulsed magnetic flux leakage testing is analyzed, and the pulse AC magnetization method is proposed. The finite element method was used to simulate the distribution of leakage magnetic field caused by the change of system parameters. The influence of lift, defect depth and width on the results of pulse magnetic flux leakage testing were analyzed. The results show that the pulse magnetic flux leakage detection method has the advantages of extracting more detection information and high output voltage amplitude under the condition of larger lift off. It will have broad application prospects in the defect detection of steel pipe.