铸钢件形状复杂, 壁厚尺寸变化大, 对其射线照相检测时, 为使透照底片有效范围内的黑度满足标准要求, 通常需对检验区域进行多次分段曝光, 但此做法易带来检验成本增加和效率降低的问题。为了在有效透照范围内最大限度地减少透照次数, 从铸件透照区域划分, 射线源特性运用, 多胶片技术, 厚度补偿和屏蔽等方面入手, 对提高铸钢件射线照相宽容度的操作技巧及其试验数据进行介绍和分析, 以为同行提供参考。

During casting radiographic inspection, the inspection area is normally divided into several sections when the shape and dimension change sharply, so that one can obtain standard transmitted film density in valid area. With this method, on the other hand, one may get a poor efficiency and an increment in the cost. In order to reduce exposure times at the maximum extent and improve radiographic inspection latitude, a systematic discussion was made on the exposure area division, source application, multiple films technique, thickness compensation and screening etc in this paper. Also, some experimental information was investigated and the effective operation technique was analyzed in order to improve radiographic inspection latitude.