共查询到19条相似文献,搜索用时 218 毫秒
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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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针对某型号车用变速箱齿轮电子束焊缝,通过对比传统目视检测以及常规超声检测方法的局限性,结合相控阵超声检测理论,提出了一种用自聚焦线阵探头配合短前沿楔块进行相控阵超声无损检测的方法,设计了一套针对该种齿轮焊缝检测的自动化相控阵超声检测系统。该系统30 s内即可自动完成一个齿轮焊缝的全记录成像检测、焊缝缺陷自动分析识别、缺陷工件自动剔除分选等全流程操作,并在某汽配厂现场进行了实际运用。结合射线检测、渗透检测以及破坏性解剖等方法对该系统性能进行了二次验证。验证结果表明该系统在该型号车用齿轮焊缝检测上具有实用性和准确性。 相似文献
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为了解决埋弧焊管焊缝缺陷检测问题,针对埋弧焊管焊缝产生缺陷的特点进行探讨,分析缺陷成因及各类无损检测方法特点,采用相控阵超声自动检测方法,通过计算机仿真软件建立埋弧焊管焊缝截面模型并模拟声束全覆盖检测,设计模拟试块应用虚拟探头排列方式对各种缺陷(纵向、横向及热影响区)进行检测。结果表明:相控阵超声自动检测技术对埋弧焊管焊缝缺陷检测结果稳定可靠,能够有效指导埋弧焊管焊缝相控阵超声自动检测工艺设计,直观显示超声波束在焊缝中的覆盖状态,克服相控阵超声检测参数设置的盲目性,为埋弧管焊缝缺陷相控阵自动检测提供借鉴。 相似文献
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针对Y型管节点焊缝的特点,为解决在Y型管节点焊缝超声波检测中的缺陷定位困难、方法繁琐和耗时严重等问题,结合计算机辅助软件,设计了Y型管节点焊缝超声相控阵检测工艺,并对该类焊缝进行试验研究。试验证实:采用计算机辅助超声相控阵技术检测Y型管节点焊缝有利于该类焊缝检测效率的提高,可以有效地避免常规方法频繁移动探头的检测方式。 相似文献
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Jing Ye Hak-Joon Kim Sung-Jin Song Sung-Sik Kang Kyungcho Kim Myung-Ho Song 《NDT & E International》2011,44(3):290-296
Phased array ultrasound testing (PAUT) can produce steerable and tightly focused ultrasonic beams, so it is widely used for detecting flaws. However, inspection of dissimilar metal welds (DMWs) using phased array ultrasound is not easy at all, since ultrasonic beams are skewed and distorted severely in the welds that are anisotropic and inhomogeneous elastic media. So, to increase focusing efficiency and have optimized conditions for inspecting the welds, quantitative prediction of phased array ultrasonic beams is needed. This paper proposes a modeling approach that includes modeling the grain orientation of the welds with buttering, calculating the ray path for the determination of focal laws, and applying the linear phasing multi-Gaussian beam model in order to focus the ultrasonic beams produced by a phased array transducer mounted on a wedge contacted to the interrogated DMW. This paper also presents an example of the model-based simulation of the focused beam fields produced in the DMW. The proposed model allows us to increase the focusing efficiency by accurately simulating the ultrasonic testing of welded components and to propose a new tool to associate welding design with the ultrasonic assessment of structural integrity. 相似文献
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The basic principle and features of ultrasonic phased array imaging are discussed in this paper,Through the ultrasonic phased array technology,the electron beam welding defects and frozen keyholes characterization and imaging were realized.The ultrasonic phased array technology can detect kinds of defects in electron beam welding (EBW) quickly and realized.The ultrasonic phased array technology can detect kinds of defects in electron beam welding (EBW) quickly and easily. 相似文献
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对比了相控阵超声和常规超声对接焊缝的检测仿真和试验,分析了对接焊缝相控阵超声检测的可靠性,为承压设备相控阵超声检测标准的制订提供相应参考。仿真与试验得出:相控阵超声检测的缺陷检出率总体上要高于常规超声检测。对于有着严重危害且对声束指向性要求较高的面状缺陷,相控阵超声的检出率要高于常规超声。对于夹渣、未焊透等体积性缺陷,相控阵与常规超声的检出率均非常高。但是对于气孔类回波较小的体积性缺陷,相控阵超声的检出率明显高于常规超声。对于工件厚度较大的焊缝,相控阵超声较常规超声技术可以扫描检测到更厚的焊缝区域。在缺陷测长方面,相控阵超声的测长结果相对于常规超声技术总体偏大,测长精度并无明显优势。 相似文献
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为了解决金属压力管道焊接接头中的未焊透缺陷定量检测技术的工程应用问题,选择了数字射线成像技术和相控阵超声技术,对碳钢和不锈钢2种材质焊接试件中的预制未焊透缺陷进行检测,并对缺陷的深度、宽度进行了定量,验证了2种方法在金属管道未焊透缺陷定量检测应用的可行性。结果表明,数字射线技术和相控阵超声技术在金属管道未焊透缺陷特征尺寸的定量检测方面,对于缺陷宽度和深度定量的准确度均可以满足在用含缺陷压力管道焊接接头安全评价的工程需要,数字射线技术在判定缺陷性质方面较有优势;相控阵超声技术检测效率高、无辐射且定量准确。在实际应用中检验人员应综合两种技术的优缺点和应用特点综合选择检测方法。
创新点: 将数字射线技术和相控阵超声技术用于金属管道未焊透缺陷定量检测,并对2种技术的精度和可靠性进行了验证,解决了金属压力管道未焊透缺陷定量检测的工程应用问题。 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