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在球罐制造的射线检测过程中,对于球罐上、下极中板的人孔、进、出气口等凸缘与球壳板的焊接对接接头的射线检测,通常采用γ射线对整条环焊缝进行一次透照检测,而焦距的选择需要满检测标准对射线检测透照厚度比(K)的要求。在透照厚度比(K)一定的情况下,射线检测最小焦距与球罐的体积、球壳板厚度及凸缘直径有关。在实际编制工艺过程中,采用计算法计算最小焦距比较困难而且容易出错,为了使γ射线检测最小焦距满足标准对透照厚度比(K)的要求,通过采用AutoCAD软件放样的办法,简便、直观,精确的测出了满足透照厚度比的最小焦距。
In the process of testing the radiation produced by the spherical tank, the ray detection of the welded butt joint of the flange of the upper and lower plate, such as the manhole, the inlet and outlet ports of the upper and lower polar plates of the spherical tank, The weld undergoes a transillumination test, and the choice of focal length requires a full testing standard for radiographic testing of transillumination thickness ratio (K) requirements. In the transillumination thickness ratio (K) is a certain case, the minimum focal length of the ray detection and the volume of the spherical tank, spherical shell thickness and flange diameter. In the actual preparation process, the calculation method used to calculate the minimum focal length more difficult and error-prone, in order to make the minimum γ-ray detection focal length to meet the standard requirements of the transillumination thickness ratio (K) through the use of AutoCAD software lofting approach, simple and intuitive , Accurately measured to meet the transillumination thickness ratio of the minimum focal length.