采用交流磁场检测法对钻具螺纹进行了探伤。
A new Nondestructive testing method, alternative current magnetic flux leakage testing, was introduced to inspect the flaw in the drilling tool thread area.
利用动态扫描工作点的信号检测方法，对传感器在不同的交流调制磁场下输出信号进行测试分析。
By active scanning method, the output signal of the sensor is detected and analyzed under different ac modulating magnetic fields.
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