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在国标GB 3323—87“钢熔化焊对接接头射线照相和质量分级”中提到K值、黑度、灵敏度、几何尺寸的控制等,为较好地满足这些要求,提高工作效率,在同样条件下应首先考虑内照法,内照法最大优点是它可以减少一次透照有效长度中心与边缘距射线源的距离差,在满足透照厚度比K值的情况下,增加了有效透照长度,与百分比探伤相比减少了拍片次数。
In the national standard GB 3323-87 “steel fusion welding butt joint radiography and quality classification ” mentioned K value, blackness, sensitivity, geometry control, etc., in order to better meet these requirements and improve work efficiency in Under the same conditions should first consider the internal illumination method, the biggest advantage of internal illumination method is that it can reduce the effective length of the transillumination center and edge away from the ray source distance difference, in the case to meet the transillumination thickness ratio K value, an increase of effective through According to the length, compared with the percentage of testing to reduce the number of filming.