火力发电厂660 MW超超临界机组运行中, 对高温再热器的焊接质量要求较高, 且作业环境困难, 检测要求严格。根据现场实际情况, 合理选择射线源和透照位置, 通过对比检测试验确定了焦距和曝光参数, 设计制定了最佳透照工艺。结果表明, 该工艺既满足了质量要求, 同时也兼顾了检测效率。

The 660MW ultra supercritical thermal power generating units of thermal power plants demand rather high requirements for the welding level of high temperature reheater, needing a more demanding working environment and stricter standard of testing. This paper shows how to choose the ray source and transillumination position reasonably based on the situation of the site, and to determine the focus and exposure parameters through experiments, and finally it designs and develops the optimum radiographic technology, which is able to meet the requirements of quality and testing efficiency.