共查询到18条相似文献,搜索用时 62 毫秒
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对小径管对接接头中存在的裂纹、未熔合和未焊透等自然缺陷分别进行相控阵超声检测和射线检测,比较分析了两种检测方法的检测结果,评述了相控阵检测的优势及其在小径管检测中的应用前景。 相似文献
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介绍小口径薄壁管环焊缝用横向曲面相控阵超声探头进行探伤与定量的新方法。制作了φ70×6.5和φ38×4两种钢试样管,试样管中加工了φ1mm通孔和深×宽=0.5mm×0.5mm(长分别为6.9mm和6.6mm)的线槽。相控阵图像仿真显示验证结果表明:曲面相控阵聚焦的缺陷定量准确度明显优于平面相控阵和矩阵探头,而且,该方法简单、经济。 相似文献
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采用相控阵超声检测技术,通过声学特性分析、模拟仿真、试块设计和验证试验,对304L不锈钢薄壁小径管焊缝的相控阵超声检测进行了研究。试验结果表明,对于未熔合、未焊透、裂纹等面积型缺陷,相控阵超声和射线检测的检出率均为100%。对于体积型缺陷,相控阵超声检测能力和射线检测相当;对于直径0.5 mm以下的小缺陷,受缺陷形貌、性质的影响,其反射波幅存在一定偏差。另外,相控阵超声检测的可达性和自检测效率优于射线检测的,且具有可进行交叉施工,结果数据可复查,数据重复性好,无辐射风险。 相似文献
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针对常规超声检测小径管焊缝存在的检测效率低、灵活性差、人为因素影响大等问题,通过专用探头及扫查器,利用超声相控阵检测技术对小径管焊缝进行了检测研究。结果表明,小径管相控阵检测装置操作简便、灵活,小径管相控阵检测能够比较直观的显示缺陷的特性,为缺陷的定性提供了一定的依据。同时,对焊缝根部及近表面缺陷具有相同的检出率,消除了焊缝的不可探区。 相似文献
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叙述小径薄壁管焊缝超声检测应用现状和发展动向。采用相控阵技术,制定适当的扫查工艺,用声线示踪法,可显示法规提出的检测体积全覆盖的范围,也能校核检测角度适当与否。相控阵可使用S(扇形)扫描或E(电子)扫描,并使用多道扫描,完成小径管检验。关键项目是解决小径管的声束散焦、薄壁管中缺陷表征定量以及使用合适的扫查器。意在为国内推广应用该新技术并制定相应工业标准提供有用借鉴。 相似文献
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将相控阵技术引入蜗壳焊缝检测,举例说明该技术在检测中的应用情况及检测效果。对主要参数的设置进行了分析,通过与其他检测方法的对比说明该技术在蜗壳焊缝检测中的优越性。 相似文献
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随着业主对相控阵超声检测技术的接受,该技术在电站项目中应用得越来越多.如何依据ASME(美国机械工程师协会)相关标准及公司内部质量控制手册对电站锅炉进行相控阵超声检测变得尤为重要.对于ASME锅炉钢印项目,现场一般会有AI(授权检验师)监督验收全部的过程文件.根据ASME钢印项目相控阵超声检测现场的演示经验,对演示试块... 相似文献
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A research about the ultrasonic phased array imaging principle from A-scan signal to B-scan image for non-destructive testing (NDT) was conducted in this paper, the ultrasonic phased array inspection imaging system used in industrial field was developed and the experiment was performed on the steel testing block by the system with 64 elements, 5 MHz phased array transducer. Experimental results show that the flaws could be accurately detected and the flaws size could be estimated from the B-scan images, and the B-scan images could clearly show the location of the flaws, but the quality of B-scan images needs to be enhanced by digital signal processing and controlling dynamic focusing for improving the image resolution. 相似文献
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As the core component of nuclear units, the inspection of low-pressure (LP) turbine disc is of particular importance to assure their quality and safety. Nevertheless, the complex structure makes the position of transducer very limited and the huge size brings about a significant amount of data. Recently, it has been suggested that compressive sensing (CS) may be promising to implement the sampling far below the Nyquist rate. In this work, a novel CS-based procedure specifically dedicated to phased array ultrasonic signals in LP turbine disc NDE is proposed, aiming to achieve high compression rate with low signal distortion. Taking the effect of sampling frequency into account, the simulation is first conducted on the signals derived from CIVA platform. An excellent recovery is reached using measurement points less than the Nyquist sampling limitation required, which confirms the miraculous power of the CS. Then experimental verification is presented on a proportional mockup with EDM notches and the reconstruction performance is compared between five greedy algorithms, like used in the simulation. Although not as impressive as the results obtained from simulated data, the Orthogonal Matching Pursuit (OMP) algorithm verifies its feasibility and effectivity in ultrasonic array signal compression with sufficient recovery accuracy. Finally, the performance of OMP-based CS is compared with the gold standard for signal compression, namely, the discrete wavelet transform (DWT). 相似文献