射线照相法对缺陷定性通常较为直观,而近来我们发现在对不锈钢埋弧自动焊焊缝拍片后,底片上出现酷似未焊透、夹渣之类的条状黑色“隐线”,给评片工作带来一定的困难。条状黑色“隐线”是什么?是否需要返修?为此我们对此类焊缝部分实体进行取样分析。1 试样来源试样取自实体对接环缝,采用自动焊,其母材为316L,厚度12mm,焊材为HOOCr19Ni12Mo2,焊剂J601,坡口系内坡口,焊接顺序是先焊筒体内部,筒体外部碳刨清根,凹槽深2～3mm,槽宽5～7mm,手工砂轮打磨至金属光泽,再焊一层,焊缝余高在2.5～3.5mm之间。2“隐线”在底片上的影象显示“隐线”在底片上呈断续状。长短不一的直线条状,线条宽0.5～1.5mm左右,黑度淡,隐约发散,通常位 Radiography is often more intuitive to characterize defects, and recently we found that after the filming of stainless steel submerged arc automatic welding, strip-like black “hidden lines” resembling impervious, Work has brought some difficulties. What is the “hidden line” of black strip? Do we need to repair it? For this reason, we carry out the sampling analysis on some of these kinds of weld joints. 1 Sample source samples taken from the physical butt joint ring, the use of automatic welding, the parent material is 316L, thickness 12mm, welding consumables HOOCr19Ni12Mo2, flux J601, groove bevel groove, the welding sequence is first welded cylinder body, Cylinder external carbon planing roots, grooves deep 2 ~ 3mm, groove width 5 ~ 7mm, manual grinding wheel polished to metallic luster, and then welding a layer, the weld height between 2.5 ~ 3.5mm. 2 The image of the “hidden line” on the film shows that the “hidden line” is intermittent on the film. The length of a straight line of the strip, the line width of about 0.5 ~ 1.5mm, light black, vague divergence, usually bit