射线双壁双投影法透照中径钢管环焊缝方法的探讨

随着电力工业的发展，高参数、大容量机组的建成，锅炉本体上有更多的连通中管，这些连通中管是整个锅炉本体的“血管”。连通中管焊口由于对口困难，施焊位置不好，焊口中易产生许多缺陷。因此，连通管焊口质量的监督关系到整个锅炉本体的安全运行。采用射线透照，依照标准ＤＬ／Ｔ５０６９—１９９６《电力建设施工及验收技术规范（钢制承压管道对接焊接接头射线检验篇）》的要求，管径大于８９ｍｍ的管道焊接接头采用双壁单投影分段透照。由于现场连通管与管之间的距离较近，有时进行分段透照困难，因此，文章通过试验分析，在分段透照困难时，采用双壁双投影透照方法也是可行的。这样不但可以提高工作效率、降低成本，还可以避免缺陷漏检。

On the method of detecting circular welding line on steel pipe by using ray projection

In the large power boiler main link pipes play a role as"vein"of the boiler.Because difficulties on alignment and bad position for welding many defects exist in welding line.In detection of those defects the too small gap between those pipes makes section detection very difficult.Through analysis this paper proposes a new method of detecting circular welding line by using bidirectional ray projection,and some examples are also given.