超小直径管X射线照相检测与评判

X-ray Radiography and Judgments on Super Small Diameter Tube

区别于小直径管焊缝射线检测通常采用椭圆成像的方法,超小直径管焊缝检测经常会用到垂直透照法。本文结合超小直径管的具体情况,通过透照厚度比和成像位移分析,对椭圆成像和垂直透照两种透照技术的选用进行了论述。并针对垂直双壁单影透照法射线影像重叠的特点,对超小直径管反面余高(焊漏)的影像特征进行了重点分析,提出了反面余高尺寸测定的两种可行方法。此外通过对垂直透照法有效透照次数的计算验证,得出了简化透照法能够满足实际工程需要的结论。

Different from the method of Oval imaging method on ray detection of narrow-bore tube weld, the Ul- tra narrow-bore tube weld detection normally use the vertical transillumination method. The essay discusses the choice of oval imaging and the vertical transillumination method through the transillumination thickness ratio and the imaging displacement analysis, base on the specific circumstances of the Ultra narrow-bore tube. According to the feature of ray image overlay of vertical double-wall single shadow transillumination, the essay do key analysis on the image fea- ture of the Ultra narrow-bore tube opposite reinforcement, propose two practical way of measuring the figure of oppo- site reinforcement. The essay concludes that the simplified transillumination satisfy the actual needs of the project.