基于DR数字射线成像技术的铝合金焊缝缺陷检测

利用DR(Digital radiography)数字射线检测方法对不同透照厚度的铝合金焊缝进行射线检测试验,优化管电压、管电流、曝光时间、放大倍数等工艺参数,使其检测灵敏度满足标准要求。在此基础上分别对铝合金熔焊缝和搅拌摩擦焊缝进行数字射线检测和常规胶片射线检测对比试验,获得典型缺陷检测图像,并对缺陷的形貌分布、尺寸、性质等进行了对比分析,分析数字射线检测的缺陷检出能力,验证数字射线检测结果的可靠性。结果表明,数字射线检测灵敏度优于标准要求,且缺陷的检出能力与常规胶片射线检测基本一致,尺寸误差小于5%。

Weld defect detection of aluminum alloy based on digital radiography

Digital radiography method was used to detect welded joints of aluminum alloy with different thickness.The process parameters such as voltage,current,exposure time and magnification were optimized to make the detection sensitivity meet the standard requirements.On this basis,digital radiography and film radiography were respectively carried out on fusion weld and friction stir welded joint of aluminum alloy to obtain the typical defect images.The morphology distribution,size and properties of the defects were compared and analyzed.The defect detection ability of digital radiography was analyzed and the reliability of digital radiography detection results was verified.The result showed that the detection sensitivity of digital radiography was superior to the standard requirements.Meanwhile,the defect detection capability of digital radiography was basically the same as that of film radiography,and the dimension error was less than 5%.