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指出在接管角焊缝圆周方向上穿透厚度的变化率和倾斜投影造成的影象畸变是确定透照工艺和进行缺陷评定的难点所在。提出目前可以采用并使之标准化、规范化的一些透照方法。
It is pointed out that the rate of change of the penetration thickness in the circumferential direction of the take-over fillet weld and the image distortion caused by oblique projection are the difficulties in determining the transillumination process and evaluating the defects. Put forward some methods that can be adopted and standardized and standardized at present.