Analysis and Improvement on the Penetration Testing Defects for J Type Joint of Head Cover and Pipe Seat in Reactor Pressure Vessel

LI En; HE Bing; JIANG Guoyan; DAI Guangming; LIU Shengbo

doi:10.7512/j.issn.1001-2303.2024.04.11

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Analysis and Improvement on the Penetration Testing Defects for J Type Joint of Head Cover and Pipe Seat in Reactor Pressure Vessel
Vol. 54, Issue 4, Pages: 77-83(2024)
Received：12 May 2023，

Revised：2024-01-30，

Published：25 April 2024
DOI： 10.7512/j.issn.1001-2303.2024.04.11
稿件说明：

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李恩，何冰，江国焱，等.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. DOI： 10.7512/j.issn.1001-2303.2024.04.11.

LI En, HE Bing, JIANG Guoyan, et al.Analysis and Improvement on the Penetration Testing Defects for J Type Joint of Head Cover and Pipe Seat in Reactor Pressure Vessel[J].Electric Welding Machine, 2024, 54(4): 77-83. DOI： 10.7512/j.issn.1001-2303.2024.04.11.

摘要

反应堆压力容器（reactor pressure vessel，RPV）管座贯穿件之间的J型密封焊缝的结构形式复杂，焊接难度大，极易产生焊接缺陷。针对某J型焊缝在水压试验后出现的渗透探伤显示进行了深入研究，通过金相分析、扫描电镜、能谱分析等手段对焊接缺陷产生的原因进行了深入分析，确定了缺陷产生的根本原因为焊接过程中焊缝熔池异物侵入导致的晶间夹杂而非DDC（高温失塑裂纹）裂纹，水压试验后使用钢丝刷对J型焊缝表面进行抛光，焊缝表面状态发生了变化，焊缝中埋藏的微小夹杂缺陷暴露于表面，在随后的焊缝渗透检验（PT）形成显示，该缺陷为浅表缺陷（表面1 mm以内），在余量允许的情况下，可通过打磨的方式去除，其关键工艺改进措施为焊接过程的清洁度管控（包括：工位清洁管控、避免焊接-打磨交叉作业、焊前除尘等）。

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

Keywords

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