射线检验程序

ensure that where the required geometric unsharpness requirement cannot be met, then the single wall viewing shall be used.

对于公称外径小于或等于90毫米的管线或其他元件焊缝，应当采用双壁双影透照方式，使射线通过双壁并使双壁的焊缝在同一张底片上成像进行观察。仅对双壁双影透照方式，透度计应当放置在源侧。应当注意，如果不能满足要求的几何不清晰度，则要采用双壁单影透照方式。 For welds, the radiation beam will be offset from the plane of the weld at an angle sufficient to separate the images of the source side and film side portions of the weld so that there is no overlap of the areas to be interpreted. When complete coverage is required, a minimum of two exposures taken 90° to each other shall be made for each joint.

对于焊缝透照，应当使射线束与焊缝成一定角度，以保证在胶片上可以分辨源侧和胶片测的焊缝影像，两边影像应没有重叠。当要求完全透照时，每个接头至少要进行2次透照，每次透照应间隔90度。

As an alternative, the weld may be radiographed with the radiation beam positioned so that the images of both walls are superimposed. When complete coverage is required, a minimum of three exposures taken at either 60° or 120° to each other shall be made for each joint.

作为可选择的方案，可以采取射线垂直于焊缝进行透照，在片子显示为两侧焊缝的影像重叠。当要求完全透照时，每个接头至少要进行3次透照，每次透照应间隔60度或120度。

Additional exposures shall be made if the required radiographic coverage cannot be obtained using the minimum number of exposures indicated in a) or b) above.

如果采用上述a）或b）所述的最少透照次数不能满足要求的覆盖范围，则应当增加透照次数。 Note:

备注： Figures 3 and 4, illustrate the double wall exposure set ups that may be used. 附图3和图4，给出了所用的双壁透照布方式。

6.5 FILM PROCESSING 胶片处理

This shall be carried out in accordance with the recognised good practice. Processing shall be carried out using the standard developer and fixer solutions, and shall be in accordance with manufacturer’s recommendations.

洗片应当按照被公认的、良好的常规做法进行。同时洗片应当使用标准的显影和定影液，也应当遵从制造商的推荐做法。

The performance of the processing will be checked daily using control strips of X-ray film exposed to a known density and processed. From the developed film, a check is taken and any density change is marked on a process control chart. Upper and lower limits are marked on the chart to provide controls against which the plot can be monitored. The results are interpreted and corrective action taken if necessary.