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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation >DETECTION OF SURFACE CRACKS IN ALLOY 600 TUBING WITH AN AC MAGNETIC BRIDGE
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DETECTION OF SURFACE CRACKS IN ALLOY 600 TUBING WITH AN AC MAGNETIC BRIDGE

机译：用AC磁桥检测合金600管中的表面裂纹

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摘要

SCC in alloy tubing produces sharp discontinuities in imaginary reluctance of sufficient magnitude to be detectable by the magnetic bridge. Incorporation of a magnetic bridge into a tube probe should eliminate the development of a large lift-off variation, as was encountered in this experiment. Such a probe might take the form of a bridge whose pole faces are surface riding on the tube ID, with motorized rotation, similar to the Motorized Rotating Pancake Coil (MRPC) type of ECT probe, which is in widespread use for tubing inspection. A smaller bridge with smaller pole faces would improve spatial resolution and would be valuable for characterizing SCC in alloy 600 and for estimating its effect on tubing integrity and residual strength. Also, a differential bridge arrangement might prove to be valuable for suppressing global material variations and enhancing crack detection and characterization.
机译：合金管中的SCC在虚拟的不稳定上产生尖锐的不连续性，可以通过磁桥可检测到足够的大小。 将磁桥掺入管探针中，应消除大量剥离变化的发展，如本实验所遇到的那样。 这种探针可能采用桥梁的形式，其杆面是管ID上的表面骑行，其具有电动旋转，类似于电动旋转骨干线圈（MRPC）类型的ECT探针，这对于管道检查是广泛的用途。 具有较小杆面的较小桥将提高空间分辨率，并且对于在合金600中表征SCC并用于估计其对管道完整性和残余强度的影响是有价值的。 而且，差动桥装置可能证明对抑制全球材料变化和增强裂纹检测和表征的价值是有价值的。

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