论文部分内容阅读
根据GB 3323—87,对小径管(D≤89mm)对接焊缝的射线照相,可采用双壁双影椭圆成象的方法。从图1可看出,小径管双壁双影照相检测时,上焊缝中缺陷Φ的底片成象,在管轴方向上的投影Φ＇和管径方向上的投影Φ″都有放大现象存在,而且上焊缝有效评定范围内各点的放大量均是变化的。在评定焊缝质量时,缺陷当量的计点换算如果仍按GB 3323—87进行计算,将会把合格的焊缝判为不合格,这样不仅造成不必要的返修,而且使焊缝质量受到返修的影响。本文主要讨论焊缝中缺陷质量等级的合理评定问题。
According to GB 3323-87, the diameter of the pipe (D ≤ 89mm) butt weld radiography, dual-wall double-ellipse imaging method can be used. As can be seen from Figure 1, when the double-walled double-walled double-tube photogrammetric inspection is performed, the negative film Φ in the upper weld is imaged, the projection φ ’in the tube axis direction and the projection Φ "in the tube diameter direction are magnified Exist, and the effective assessment of the weld within the scope of the magnification are varied.When assessing the quality of the weld, the defect equivalent amount of point conversion if still calculated according to GB 3323-87, will be qualified weld Convicted as unqualified, this will not only cause unnecessary rework, but also affect the quality of the weld repaired.This paper mainly discusses the reasonable assessment of the defect quality level in the weld.