冷建成，田洪旭，周国强，吴泽民

(东北石油大学 机械科学与工程学院，黑龙江 大庆 163318)

自升式海洋平台关键部位MMM与ACFM联合检测

冷建成，田洪旭，周国强，吴泽民

(东北石油大学 机械科学与工程学院，黑龙江 大庆 163318)

针对传统无损检测方法对自升式海洋平台检测工作量大、费时费力等问题，提出了一种金属磁记忆(MMM)与交流电磁场(ACFM)联合检测的新方法。在简介MMM和ACFM检测机理之后，将其应用到自升式海洋平台关键部位的无损检测中。分别以齿条座板与桩腿之间的T型焊缝和桩腿环焊缝为例，首先通过MMM快速全面扫描待检测表面，基于磁场分布及梯度值确定应力集中部位；在此基础上，利用ACFM方法重点对应力集中部位进行裂纹缺陷的定量化检测，结果表明MMM对应力集中或微观缺陷非常敏感，而ACFM方法可精确给出裂纹缺陷的深度信息，为平台结构的安全可靠运行和维修方案制定提供了方法参考和理论依据。

自升式海洋平台；金属磁记忆；交流电磁场；无损检测

Abstract: In view of the inconvenience such as heavy workload, time-consuming and laborious damage detection on jack-up offshore platform using traditional nondestructive testing methods, a new approach combining metal magnetic memory(MMM) and alternating current field measurement(ACFM) is proposed. After the detection mechanisms of MMM and ACFM were introduced, they were both applied to detect critical parts of the jack-up offshore platform nondestructively. By taking the T-type weld between rack seat plate and leg and the girth welding seam as examples, the pending surfaces were first detected quickly using MMM method, and the stress concentration zones were determined by virtue of magnetic field distributions and their gradient values. On this basis, the quantitative detection of cracks in the stress concentration zones was carried out using ACFM method emphatically. The results show that MMM method is very sensitive to stress concentration or microscopic defects, whilst ACFM method can give the depth of crack accurately, providing an approach reference and theoretical basis for safe operation and maintenance plan of platform structure.

Keywords: jack-up offshore platform; metal magnetic memory; alternating current field measurement; nondestructive testing

随着国家对海洋石油勘探开发支持力度的加大，油气开采作业所面临的环境也更加恶劣；而随着服役年限的增加，越来越多的自升式平台已临近甚至超过其设计服役寿命，平台结构可能会产生裂纹、变形以及腐蚀等缺陷，这些损伤会降低平台结构的承载能力，其可靠性和耐久性受到严峻挑战。为了保障平台正常安全作业，就需对其进行结构无损检测甚至健康监测。

目前，对海洋平台进……