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堆焊层厚度的精确测量对于堆焊材料的合理利用有重要意义。本文基于超声测厚原理,在超声波探伤仪和直探头校准的基础上,提出了等离子弧粉末堆焊层厚度测量的数学模型,实现了堆焊层厚度的精确测量。堆焊层厚度的测量分为三个步骤:首先测出母材的厚度;其次测出母材上方堆焊层的厚度;最后从堆焊层的金相照片中测出母材中熔焊层的厚度,从而根据提出的数学模型得到堆焊层的厚度。与游标卡尺测厚相比,该方法简便可行,检测速度快,可大大减轻检测人员的劳动强度。另外,难以采用游标卡尺测量的部位,也可采用本文提出的方法进行测量。 相似文献
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In this paper, the X-ray nondestructive test method of small defects in precision weldments with complex structure was presented. To resolve the difficulty of defect segmentation in variable grey image, the image processing based on Visual Basic programming method was adopted. The methods of automatic contrast and partial grey stretch were used to enhance the X-ray detection image which has relatively low contrast, then automatic threshold method was carried out to segment the two high intensity zones, and weld zones which contain the small defects was extracted. Smoothing and sharpen processing were proceeded on the extracted weld zones, and small defects in X-ray detection image of weldments with complex structure were segmented by using the method of background subtraction in the end. The effects of raster were eliminated, and because of that the image processing was only proceeded on the extracted weld zones, the calculated speed using the above provided algorithm was improved. 相似文献
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为了确定工字形焊件中批量缺陷的空间位置,采用多视角几何的方法对其进行了无损检测.提出了工字形激光焊件中小缺陷的深度与偏移量计算的数学模型,确定了精密焊缝中小缺陷的深度和偏移量.对影响缺陷定位精度的因素进行了理论分析,得出了影响缺陷定位精度的主要因素.为了实现焊件的快速检测和提高检测的鲁棒性,在缺陷分割与细化的基础上提出了缺陷投影距离自动提取的算法,并采用模拟缺陷的方法对上述算法进行了验证.结果表明,该方法是可行的. 相似文献
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