金属管道未焊透缺陷定量检测方法

Quantitative detection method of incomplete welding defects in metal pipeline

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。

In order to solve the engineering application problem of quantitative detection technology for incomplete welding defects in welded joints of metal pressure pipes, digital radiographic technology and phased array ultrasonic technology were selected to detect the prefabricated incomplete welding defects in carbon steel and stainless steel welded specimens, and the depth and width of defects were quantified, which verified the feasibility of the two methods in quantitative detection of incomplete welding defects in metal pipes. The results show that the accuracy of digital ray technology and phased array ultrasonic technology in quantitative detection of the characteristic size of incomplete welding defects in metal pipes for the quantification of defect width and depth can meet the engineering needs of safety evaluation of welded joints in pressure pipes with defects. Digital ray technology has advantages in determining the nature of defects;Phased array ultrasonic technology has the advantages of high detection efficiency, non radiation and accurate quantification. In practical application, the inspector shall comprehensively select the detection method based on the advantages, disadvantages and application characteristics of the two technologies.