摘要
采用超声导波检测方法,对中央空调冷冻水管道腐蚀缺陷进行了检测。对导波反射回波信号进行标定,拆除保温层对疑似缺陷进行验证,计算缺陷处管道周向腐蚀减薄率,并分析了影响缺陷回波信号的因素。结果表明,超声导波检测能够实现腐蚀缺陷的快速检测与定位;波包在支管与大小头处发生模态转换与发散,使得其后的区域成为检测盲区;导波信号在管道外壁腐蚀层的吸收作用下迅速衰减,沿长度方向的反射回波强度迅速下降。
Corrosion defects in central air-condition chilled water pipelines were tested using ultrasonic guided wave. Reflection signals were marked and suspected defects were verified after removal of the insulating layer. The corrosion rate of the defects in the circumferential direction was calculated, and different factors affecting the reflection signals were studied. The results show that the ultrasonic guided wave method can test and locate the corrosion defects rapidly. Guided wave modes transform and wave packets disperse in the branch and adjustable tube, so the testing results in the areas behind such structures are invalid. Guided wave weakens rapidly due to the corrosion layer＇s absorb leading to the decline of reflection signals along pipelines.
出处
《腐蚀与防护》
CAS
北大核心
2013年第7期628-631,共4页
Corrosion & Protection
关键词
超声导波
管道腐蚀
无损检测
ultrasonic guided wave
pipeline corrosion
nondestructive testing
