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首页> 外文会议>Second Pan-American Conference for Nondestructive Testing (PACNDT) and ASNT's International Chemical and Petroleum Industry Inspection Technology (ICPIIT) VII Topical Conference, Jun 18-22, 2001, Houston, Texas, USA >In-Service Inspection of Coated Carbon Steel Welds Using Eddy Current Techniques
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In-Service Inspection of Coated Carbon Steel Welds Using Eddy Current Techniques

机译：使用涡流技术的涂层碳钢焊缝在役检查

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摘要

This paper will describe the development of the application of eddy-current techniques to Coated "As-Welded" Carbon Steel Welds. Emphasis will be given to probe design and limitations, personnel and practical tuition also being addressed. Traditionally surface crack detection in Ferritic Steel Welds with Eddy-Current Techniques has been difficult due to the change in material properties in the Heat Affected Zone. These typically produce signals much greater than crack signals. Sophisticated probe design and construction, combined with modern electronic equipment, have largely overcome the traditional problems and now enable the advantages of Eddy-Current Techniques to be applied to "In-Service Inspection of Ferritic Steel Structures in the 'As-Welded' Conditions". Specifically, the advantage of the technique is that under specific conditions an inspection may now be carried out through corrosion protection systems. This means the costly removal and replacement of the protective coating is now not necessary. An additional advantage is that, on detection of surface breaking defects, the amplitude of the signals obtained, given the appropriate corrections for coating thickness, geometry etc., can be compared directly with the slots in the calibration block, therefore enabling decisions on appropriate remedial action to be taken immediately.
机译：本文将描述涡流技术在涂层“焊接”碳钢焊接中的应用发展。将重点介绍探针的设计和局限性，同时还要解决人员和实际学费问题。传统上，由于热影响区材料性能的变化，利用涡流技术检测铁素体钢焊缝中的表面裂纹非常困难。这些通常会产生比裂纹信号大得多的信号。精密的探头设计和构造，再加上现代的电子设备，已在很大程度上克服了传统问题，现在使涡流技术的优势可用于“在'焊接'条件下的铁素体钢结构的在役检查” 。具体而言，该技术的优势在于，现在可以在特定条件下通过腐蚀防护系统进行检查。这意味着现在不需要昂贵的去除和更换保护涂层。另一个优点是，在检测到表面破损缺陷时，如果对涂层厚度，几何形状等进行了适当的校正，则所获得信号的幅度可以直接与校准块中的槽进行比较，从而可以做出适当的补救措施立即采取行动。

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