Application Note 002
操作说明００２
Inspection of rubber lined metal pipes or vessels for disbonds
检查橡胶衬里的金属管道或容器的脱胶
Motivation: Many metal pipes or vessels have rubber or other linings on the inside diameter for
transport or mixing of certain fluids. There is a common requirement to be able to inspect the bonding
between the metal and liner.
动机：许多金属管道或容器上有橡胶或其它衬里内径运输或某些流体混合。有一个共同的要
求，一般需要检查金属和衬管之间的胶合。
Principle: By using a transducer that can penetrate the rubber through the bondline, the amplitude of
the interface can be measured with a flaw gate. Good bonding will attenuate the signal. A disbond will
return a higher amplitude echo since the sound cannot now penetrate the rubber.
原理：通过使用一个探头，能够穿透橡胶通过胶层的振幅、接口，可以测量缺陷。良好的粘接，将
信号衰减。脱层将返回一个更高的幅度回声，声音无法穿透橡胶。
Challenge: Initial tests with a 5MHz tranducer showed that we did not penetrate the rubber since a
known disbond was not resolved. Therefore a lower frequency 2.25MHz was used with a composite
construction to give better penetration and an improved signal to noise ratio. A dual-element was also
required because of the curvature of the pipe; a single element was too sensitive to rocking of the
transducer.
分析：起初我们使用准备好的频率为５ＭＨｚ探头时，声波无法穿透橡胶。工件上已知的脱胶部位的
反射波没有被显示出来。
因此我们使用了频率低一点的２．２５ＭＨｚ探头，得到了更好的穿透改进了信噪比。
需使用双晶探头检测， 因为单晶探头无法消除盲区。
Solution:
* Raptor Imaging Flaw Detector
* RCA-10 or RCA-18 scanner
* Dual-element 2.25MHz composite transducer (1/4”) Part No. AE07E06
方案：
１．Ｒａｐｔｏｒ成像探伤仪
２．ＲＣＡ－１０或ＲＣＡ－１８扫查器
３．双晶２．２５Ｍ探头，编号：ＡＥ０７Ｅ０６
Results:
结果：
Figure 1. C-scan of pipe. Initial results using 5MHz dual-element. Variable shows % flaw gate height.
图１ Ｃ－扫描管道。初步结果使用５ＭＨｚ的双晶探头。变量用百分比显示裂隙门的高度
Figure 2. C scan of pipe using 2.25MHz transducer. Variable shows % flaw gate height.
图２。使用２．２５ＭＨｚ的探头。裂隙门高度可用百分比显示
Conclusion: Pipes and vessels with bonded internal liners can be inspected for disbonds automatically
using the Raptor and RCA-10 or RCA-18 and a low frequency composite dual-element transducer.
ｄｕａｌ－ｅｌｅｍｅｎｔ ｔｒａｎｓｄｕｃｅｒ结论：管道和容器与保护的内部衬垫脱胶可使用猛禽和
ＲＣＡ－１０或ＲＣＡ－１８和低频双晶探头检查 |
