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在管子对接焊缝双壁透照时,对相对灵敏度计算公式中射线穿透厚度值的选取,有两种不同的认识,一种认为射线穿透厚度仅选取单侧壁厚加上一个焊缝余高而靠近射源侧的壁厚不予考虑,持这种观点的同志认为射源侧壁厚起到滤波板的作用并不影响相对灵敏度的计算;另一种认为射线穿透厚度应考虑双层壁厚再加上一个焊缝余高,这种观点的同志认为影响透照灵敏度的诸因素中射线硬度的选取起着主导作用,决定于被射线穿透的材料总厚度,射线硬度增大时主因衬度降低,必然导致透照灵敏度要下降,若按单壁考虑和规程中规定也
In the pipe butt weld double-wall transillumination, the relative sensitivity of the formula to calculate the ray penetration thickness of the value of the selection, there are two different ways of understanding, one that ray penetration thickness only select one side wall thickness plus a weld The height of the wall near the source side is not taken into consideration. Comrades holding this view think that the thicker side of the source wall does not affect the calculation of the relative sensitivity; on the other hand, the thickness of the ray penetration should be considered Double wall thickness coupled with a weld remaining high, comrades of this view that the factors affecting permeability sensitivity of ray hardness plays a leading role in determining the total thickness of the material being penetrated by rays, ray hardness increased Large Lord because of reduced contrast, will inevitably lead to the sensitivity of transillumination to decline, if the single-wall considerations and procedures specified