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X射线实时成像在焊缝探伤中的应用 总被引:7,自引:1,他引:7
X射线实时成像是一项新兴的无损检测技术,它具有快速、准确、直观、成本低廉等优点,可以代替常规的X射线胶片照相探伤方法.概述了X射线实时成像技术的要点和在焊缝探伤中的应用情况. 相似文献
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X射线实时成像技术在焊缝探伤中的应用 总被引:3,自引:0,他引:3
X射线实时成像是一项新兴的无损检测技术,它具有快速、准确、直观、成本低廉等优点,可以代替常规的X射线胶片照相探伤方法。本文概述了X射线实时成像技术的要点和焊缝探伤中的应用情况。 相似文献
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本文详细介绍便携式工业X射线探伤机曝光曲线的制做方法,使用试块精度高、设计新颖,为射线探伤机的使用提供了精确、方便的理论依据。 相似文献
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X射线实时成像系统的应用 总被引:1,自引:0,他引:1
X射线照相法操作简单、结果显示直观,是企业常用的无损检测方法之一。但该方法检测成本高,检测图像不能动态可调,因此目前国外已普遍采用X射线实时成像系统和工业CT成像系统。X射线照相法是作者单位使用最广泛的无损探伤方法,仅胶片一项,每年就需要十几万元,而X射线实时成 相似文献
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介绍新一代X射线无损检测设备-3010X射线探伤机,对其采用的各种新技术新成果作概要说明,重点了分析了有关主要技术指标的试验数据及图像处理中的积分降噪问题,指出了本领域面临的问题及其解决思路。 相似文献
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讨论了BGA封装器件焊接的特点,并对BGA封装器件焊点检测方法进行了阐述。采用X射线检测法,通过图像处理技术检测每个焊点的面积、质心和圆度,以此来判断焊点是否有漏焊、焊锡球、桥连、焊球过大或过小、偏移以及焊球变形等缺陷。试验证明,所用系统可以快速、准确地检测出BGA封装器件中常见的焊点缺陷,为BGA封装器件焊点的质量提供保障。 相似文献
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针对X射线线阵探测器实时成像的焊缝图像,提出了降噪处理、焊缝图像分割及缺陷检测的方法.通过自适应中值滤波方法对焊缝图像进行滤波降噪,利用类间、类内方差比分割法和数学形态学方法进行焊缝图像分割,对焊缝部分应用高频加强变换提取焊接缺陷.结果表明,采用自适应中值滤波能够有效去除噪声的同时保留焊缝和缺陷的边缘细节;类间、类内方差比分割方法与数学形态学方法并用能准确地将图像分割为焊缝与母材区域;高频加强变换能使焊缝中心部位灰度变化突显进而实现缺陷检测. 相似文献
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在不等厚钢板搭接焊缝X射线检测图像中,由于工件及焊缝厚度变化带来的图像背景灰度差异、焊缝区灰度连续变化等,给基于图像处理的缺陷自动识别带来困难.同时,被检测焊缝装卡的空间位置具有不确定性,垂直布置的焊缝和重力方向存在一定角度,不便于缺陷自动识别及定位.文中给出一种基于不变矩的X射线图像校正方法,解决焊缝图像倾斜问题;在此基础上,给出一种图像噪声抑制、背景去除、图像分割及数学形态学相结合的缺陷识别方法.结果表明,所提方法能有效识别不等厚搭接焊缝中的气孔类缺陷,适用于自动检测. 相似文献
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A. R. Potter J. C. Austin R. M. Ormerod P. W. Haycock B. R. Heywood S. D. George 《NDT & E International》2003,36(2):77-83
The drying phase during the manufacture of ceramic pieces is often the point of failure owing to the formation of cracks. In this study, non-destructive microfocus X-ray imaging has been employed to study the onset of cracking in porcelain and correlate it with the moisture content. Samples of moist porcelain paste were extruded through dies of 30 and 50 mm diameter. Sections of the extrudate were placed into an X-ray transparent oven and imaged while drying at constant temperature and low humidity. The time to the onset of cracking was found to be a function of temperature. The mode of failure was consistent across the temperature range 40–120 °C.The higher the drying temperature, the shorter the time to failure and the higher the moisture loss at failure. For a particular paste consistency and sample geometry there was found to be a critical moisture content below which cracking began to occur. This moisture threshold was observed to be weakly temperature dependent; it appears to be more sensitive to sample geometry and paste consistency. A safe drying curve has been constructed which provides a boundary for the process parameters which prevent cracking. The implication is that during the drying of a ceramic piece, different sections may have different safe parameter boundaries and the process must be designed to keep all sections within the safe region. 相似文献
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The computer evaluation of weld X-ray film is an attractive technique for weld seam NDT (nondestructive testing).To achieve this target,digitalization of film is the first step and automatic defect identification is another key techniqae.In this paper,a weld X-ray film digitalizing system has been established with linear array CCD and highlight LED light source.Its space resolution can reach 0.04 mm/pixel and scanning speed can reach 100 mm/s for an industrial film.The transfer function curves of the system have been measured and the results indicate that its image gray resolution can reach 88 G/D at 4.5D,and its dynamic range can be wider than 2.0D.In order to facilitate the evaluation of large welded structure,a panoramic evaluation algorithm is developed also.The algorithm includes image matching,image fusion and panoramic evaluation of the long linked film image. 相似文献