【摘要】 根据双壁双投影射线成像中小径管焊口的投影特点,分析了不同缺陷在不同部位的变化及规律,提出了正确评定缺陷的方法。采用该方法对华能鹤岗发电有限公司1021t/h锅炉以及其它同类型在建机组锅炉受热面小径管焊口进行检验评定分级,效果良好。经过对部分焊口进行解剖对照,结果基本相近。更多还原

【Abstract】 Based on projection features of the small-diameter tubes’ welded seam in dual-wall and dual-projection radiographic imaging, the variation and regularity of different defects in different parts have been analysed, and correct evaluation method of defects being put forward. Evaluation and gradation of small-diameter tubes’ welded seams on heating surface of a 1021 t/h boiler and other similar boilers of units under construction in Huaneng Hegang Power-Generation Co Ltd have been made, obtainging good results. Through dissection and comparison of some welded seams, the results are basically similar, playing a good role in ensuring engineering quality and welding quality.更多还原