磁致伸缩导波检测技术对管道具有高效、全横截面检测等优点，但导波的检测效果易受多种因素，如弯头、支架和焊缝等的影响。针对检测试验中发现的分层腐蚀缺陷，通过解剖等试验手段，开展其对磁致伸缩导波信号的衰减影响的试验。试验结果表明，穿透分层腐蚀缺陷对导波信号的衰减影响剧烈，且难于用其他检测方法验证。

The technology of magnetostrictive guided waves has been extensively applied in pipeline detection because of the excellent advantages, high efficiency and comprehensive detection of cross section, for example. However, the effectiveness of guided wave detection technique is affected by various factors, such as elbow, bracket bearing and welds, which might lead to detection failure. In this paper, based on corroded lamination defects which are discovered in the experiments, the attenuation effect of magnetostrictive guided waves caused is investigated with careful anatomy. The results show that the laminated corrosion defect has severe impact on the signals loss and it is also difficult to be determined by other non-destructive testing methods also.