电焊机2024，Vol.54Issue(4)：77-83,7.DOI:10.7512/j.issn.1001-2303.2024.04.11
反应堆压力容器管座贯穿件与顶盖J型焊缝缺陷分析及改进
Analysis and Improvement on the Penetration Testing Defects for J Type Joint of Head Cover and Pipe Seat in Reactor Pressure Vessel
李恩 1何冰 1江国焱 1戴光明 1刘盛波1
作者信息
- 1. 东方电气(广州)重型机器有限公司,广东 广州 511455
- 折叠
摘要
Abstract
The complicated structure for J type joint of head cover and pipe seat in reactor pressure vessel and weld defects has been puzzled the manufacturers of nuclear island equipment.In this paper,the causes of penetration testing defects were deeply analyzed according to metallographic structure analysis,scanning electron microscopy,energy spectrum analysis,which was determined that the primary cause of the defect was intercrystalline inclusion caused by foreign body invasion in the weld pool during the welding process rather than DDC crack.After hydrostatic test,the weld surface had been polished by brush,and the surface of weld was breaked.The tiny inclusion embedded in the weld are exposed to the surface.The defect is superficial(within 1mm of the surface)which could be removed by grinding under the condition that the margin is rich.The key process improvement measures were the cleanliness control of the welding process including that station cleaning control,avoiding welding and grinding cross operation and dust removal before welding.关键词
J型焊缝/渗透检验/夹杂/改进措施Key words
J type of joint/penetration testing defects/inclusion/improvement分类
金属材料引用本文复制引用
李恩,何冰,江国焱,戴光明,刘盛波..反应堆压力容器管座贯穿件与顶盖J型焊缝缺陷分析及改进[J].电焊机,2024,54(4):77-83,7.
