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本文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。提出锅炉厚壁小径管和高合金耐热铜小径管及其异种钢对接焊缝,其椭圆开口尺寸应按下限(3～5mm)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 article discusses the characteristics of double-wall double-ellipse ellipse imaging radiography with small diameter tube butt welds. Proposed boiler thick-walled small diameter pipe and high-temperature heat-resistant copper small diameter pipe and its dissimilar steel butt weld, the size of the oval opening should be strictly controlled by the lower limit (3 ~ 5mm), and should be supplemented by other methods (ultrasonic and surface inspection) Crack prevention and root defect inspection. It is pointed out that the detection range and the sensitivity of double-wall double-imaging double-imaging double-coated imaging film can be effectively and reasonably evaluated with the special double-wire image quality meter.