Ultrasonic Signal Processing for Bonding Quality Testing of Pipeline Joint Coatings
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摘要: 管道补口粘接质量超声检测技术具有广泛的应用前景，分析了管道补口超声检测的理论模型，使用5 MHz水浸探头对粘接质量不同的管道补口试样进行了超声检测试验；根据回波信号的特点区分出了表面回波及胶层上下界面回波，归纳总结了检测信号随粘接质量的变化趋势。提出了混合信号总强度E及混合信号频谱强度F两个评价参数，对检测信号进行了参数计算、对比及分析；结果表明，评价参数E和F能够反映管道补口的剥离强度，可以用于粘接质量的评价。Abstract: The ultrasonic technique for bonding quality testing of pipeline joint coatings has a broad application prospect. In this paper, the theoretical model of pipeline joint coatings was analyzed for ultrasonic testing. Several pipeline samples of different bonding quality were tested in immersed method, using a specific transducer whose center frequency was 5 MHz. The echo signals of the testing experiment were distinguished into a signal coming from the surface and two signals from the upper and the lower interface of the adhesive layer respectively. The changing trends of these signals related to bonding quality were summarized in this paper. Two calculating parameters were introduced in this paper, named as E for total intensity of mixed signal and F for frequency intensity of mixed signal. Both parameters were calculated for signals from different samples and the results were analyzed and compared, which showed that both E and F were available parameters for quality evaluation of pipeline joint coatings, as the calculation results of E and F could represent the bonding quality to some extent.
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Keywords:
- Pipeline joint coatings /
- Bonding quality /
- Ultrasonic testing /
- Signal processing
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