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檢測管道腐蝕或及其內襯橡膠膠接

Application Note 002
操作說明002
Inspection of rubber lined metal pipes or vessels for disbonds
檢測管道腐蝕或容器與其內襯橡膠脫膠

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.
案例：許多金屬管道或容器里有橡膠或其它內襯用以混合液體，一般需要檢查金屬和內襯橡膠之間的結合。

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：我們需要選用一個能穿透（良好膠接口下的）橡膠的探頭，然后利用缺陷閘門檢測回波的波幅。良好
的膠接口會令信號衰減。在脫膠的地方由于聲波沒法穿透空氣，會有較高幅度的回波反射。

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：起初我們使用5MHz的探頭，由于聲波沒法穿透橡膠，因此工件上已知的脫膠部位無法顯示出來。
因此我們使用頻率稍低的2.25MHz探頭，能穿透橡膠和改進了信噪比。另外由于管道有弧度，所以
需要使用雙晶探頭。因為單晶探頭無法消除盲區。

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成像探傷儀
2.RCA-10或RCA-18掃查器
3.雙晶2.25MHz探頭，編號：AE07E06

Results:
結果：

Figure 1. C-scan of pipe. Initial results using 5MHz dual-element. Variable shows % flaw gate height.
圖1 C-掃描管道。初步結果使用5MHz的雙晶探頭。不能明確顯示已知脫膠位置。

Figure 2. C scan of pipe using 2.25MHz transducer. Variable shows % flaw gate height.
圖2 使用2.25MHz的探頭。可明顯看到回波幅度較大位置代表脫膠位置。

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.
結論：使用Raptor,RCA-10或者RCA-18掃查器和低頻雙晶探頭，可自動檢測管道
和容器與其內襯的脫膠。

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檢測管道腐蝕或及其內襯橡膠膠接