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讨论了小径管对接焊缝射线探伤双壁双影椭圆成像透照技术特点 ,提出电站锅炉厚壁小径管和高合金耐热钢小径管及其异种钢对接焊缝 ,其椭圆开口尺寸应按下限 (3～ 5 mm)严格控制 ,并应辅以其他方法 (超声波和表面探伤 )以防裂纹和根部缺陷漏检 ,指出用专用双丝像质计可有效和合理地评价小径管对接焊缝射线探伤双壁双影一次成像底片的检出范围和灵敏度
This paper discusses the technical characteristics of the double-wall double-ellipse ellipse imaging technology of radiographic flaw detection of small-diameter pipe butt welds, and proposes the thick-walled small diameter pipe and high-alloy heat-resistant steel small diameter pipe and dissimilar steel butt weld of power station boiler. (3 ~ 5 mm) strictly controlled, and should be supplemented by other methods (ultrasonic and surface inspection) to prevent cracks and root defects, missed inspection, pointed out that with a dedicated dual-wire image quality meter can be effective and reasonable evaluation of small diameter butt weld ray Detection of double-wall double-imaging negative film detection range and sensitivity