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针对某天然气管道工程用X70级1 016 mm×17.5 mm焊管环焊缝焊接接头出现的缺陷,应用超声波检测和射线检测方法对缺陷进行了定位和定量检测,并通过金相分析、扫描电镜分析了缺陷中材料的性质。分析结果表明,此缺陷为第一次焊接过程中产生的焊渣在第二次补焊时未清理干净而产生的坡口未熔合。同时,分析了由于射线检测透照角度不同造成的射线底片影像异常现象。最后给出了焊接和无损检测过程中的一些合理化建议。
Aiming at the defects of weld joint of X70 grade 1 016 mm × 17.5 mm welded pipe girth welds for a natural gas pipeline project, the defects were located and quantitatively detected by ultrasonic inspection and ray inspection. The defects were analyzed by metallographic analysis and scanning electron microscope The nature of the material in the defect. The analysis results show that the defect is that the groove generated during the first welding process is not fused when the second welding is not cleaned. At the same time, the anomalies of radiographs caused by the different perspectives of radiographs were analyzed. Finally, some reasonable suggestions in welding and nondestructive testing are given.