在对不加垫板的单面焊缝的射线透照底片进行评定时，未焊透缺陷的等级评定是根据未焊透工件中埋藏深度来确定，也就是依据X光底片上来焊透部位的黑度大小来确定。如果只凭经验观察底片上未爆透部位的黑度变化来评定等级，而没有适当的检验方法和对比手段，当通过实物解剖时往往 In the unlabelled single-sided radiographs of radiographic films were evaluated, the level of impermeable defects was assessed based on the depth of the unwedged workpiece to determine the depth, which is based on the X-ray film on the site to penetrate Black size to determine. If only by empirical observation of unexpressed parts of the blackness changes to assess the level, without appropriate testing methods and comparative means, when the physical dissection often