Detection of Critical Welds of Ocean Platform Drilling Rig Substructure Using Alternating Current Field Measurement Technique
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摘要: 为了对带有涂层的在役海洋平台钻机底座焊缝进行检测,使用了交流电磁场(ACFM)检测方法.介绍了ACFM检测的基本原理,并与磁粉检测、涡流检测等表面缺陷检测方法进行了对比分析.基于平台底座结构及其所处环境的特点,确定了将ACFM检测系统成功应用于底座关键焊缝的表面或近表面缺陷检测,重点探讨了纵向裂纹和横向裂纹的ACFM扫描方法和信号识别.总结了ACFM现场工程应用的一般流程和检测程序,对其他工程结构的ACFM检测具有很好的借鉴意义.Abstract: A new method using alternating current field measurement(ACFM) has been proposed in order to nondestructively inspect the critical welds of the in-service offshore platform drilling rig substructure with coatings.The detection principle of ACFM method is first introduced and is compared and analyzed with other nondestructive testing methods for surface defects,including MT and ET.Based on the structural characteristics and the special working environment of the platform drilling rig substructure,the corresponding ACFM detection system is presented,which is applied successfully to test surface or sub-surface defects of the critical welds of the rig substructure,and the scanning methods and signal recognition for the longitudinal and transversal cracks are emphatically discussed.At last,the general process and detection procedure of engineering application using ACFM method are summarized systematically,providing a good reference for ACFM inspection of other engineering structures.
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