黑度是衡量底片质量的一项重要指标, 现行钢管制造标准及其引用的相关检测标准对黑度的规定存在差异, 在双面埋弧焊钢管管端焊缝射线检测的实际工作中常常因黑度问题发生争议。通过射线检测理论结合实际应用情况深入分析探讨, 指出了DEP 31.40.20.37:2013标准对黑度的严格规定缺乏合理性, GB/T 9711-2011等标准对黑度的规定存在不合理的宽松情况, 从而总结提出相对合理的黑度指导规定。

Density is one of the important indicators to measure film quality. There are different requirements for density in existing pipe manufacturing standards and their cited testing standards. Therefore, disputes are caused by different density requirements in the actual radiographic testing of weld seam at the double SAW pipe ends. Through thorough analysis and investigation by combination of radiographic testing theory and actual application, it was pointed out the lack of rational strictness of density requirements in standard DEP 31.40.20.37:2013 as well as the irrational leniency of density requirements in GB/T 9711-2011 and other standards. At last the relatively reasonable guideline for density requirements was summarized and proposed.