The result shows that there is high rate of recognition about the little defect on the thin steel pipe by alternative current magnetic leakage flux method.
结果表明，该交变漏磁法对钢管表面较小裂纹具有较高的检出率。
Alternative magnetic leakage flux method was developed from the eddy current testing and traditional magnetic leakage flux testing, and it was advantageous for surface flaw recognition.
交变漏磁检测方法由于兼具涡流检测和传统漏磁检测的特点，对表面缺陷具有很高的识别率。
A new Nondestructive testing method, alternative current magnetic flux leakage testing, was introduced to inspect the flaw in the drilling tool thread area.
采用交流磁场检测法对钻具螺纹进行了探伤。
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