某核电厂高压缸缸体缺陷成因分析及焊接修复
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- 英文论文题名：Analysis of the cause of defect and welding repair for high pressure cylinder in a NPP
- 论文作者：李邱达 ; 唐世延 ; 高飞 ; 方江 ; 毛彩云 ; 徐秋旻
- 英文论文作者：LI Qiu-da ; TANG Shi-yan ; GAO Fei ; FANG Jiang ; MAO Cai-yun ; XU Qiu-min ; CNNP Nuclear Power Operations Management Co. ; Ltd.
- 年：2015
- 作者机构：中核核电运行管理有限公司;
- 论文关键词：高压缸 ; 铸钢 ; 缺陷 ; 焊接修复 ; 镍基焊材
- 英文论文关键词：high pressure cylinder ; casting steel ; defect ; welding repair ; nickel-based welding materials
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第3册（核能动力分卷（下））
- 语种：中文
- 分类号：TM623
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：7
- 文件大小：690k
- 原文格式：O
- 会议级别：全国
摘要
某核电厂高压缸缸体内表面存在多处裂纹、夹杂、砂眼、肉瘤、疏松、减薄等缺陷,在运行过程中受高温高压环境、蒸汽冲蚀以及机组启、停时的交变应力共同作用,引起缸体表面开裂,严重危害机组的安全稳定运行。本文分析了缸体开裂的根本原因、大型铸钢件焊接修复的技术难点;对比分析了铸钢材料三种焊接修复方案的优缺点后,选用了镍基焊材低温预热焊接方法,既简化了现场施工步序、减少缸体变形,又提高焊接接头的机械性能与抗裂能力;通过焊接工艺试验、金相组织分析及力学性能试验,获得了合格的工艺参数。现场采用该工艺对高压缸进行了焊接修复,机组运行至今修复效果良好;可为其他电厂铸钢件的焊接修复提供技术参考。
Several defects were found on the surface of high pressure cylinders in A NPP including crack,mixed impurity,sand hole,loosen,reduction and so on,which might cause cracking under the combined action of high temperature and pressure,steam erosion,alternating stress and be seriously harm to the security and stability operation of the unit.The research analyzed the causes of cracks in the cylinder and technical difficulties for casting steel welding repairing,as well as the advantages and disadvantages of the three welding repair scheme and finally decided to utilize low temperature preheating with the Nickel-based Welding Materials.Through the welding experiment,microstructure analysis and mechanical test,qualified welding repair process parameters were developed.The process was adopted during in-site repairing the cracks of four high-pressure cylinders.After the units are fully operational,the repaired zones have exhibited a good result until now.The welding repair process can provide a reference for other plants welding repairing similar casting steels.
Several defects were found on the surface of high pressure cylinders in A NPP including crack,mixed impurity,sand hole,loosen,reduction and so on,which might cause cracking under the combined action of high temperature and pressure,steam erosion,alternating stress and be seriously harm to the security and stability operation of the unit.The research analyzed the causes of cracks in the cylinder and technical difficulties for casting steel welding repairing,as well as the advantages and disadvantages of the three welding repair scheme and finally decided to utilize low temperature preheating with the Nickel-based Welding Materials.Through the welding experiment,microstructure analysis and mechanical test,qualified welding repair process parameters were developed.The process was adopted during in-site repairing the cracks of four high-pressure cylinders.After the units are fully operational,the repaired zones have exhibited a good result until now.The welding repair process can provide a reference for other plants welding repairing similar casting steels.
引文
[1]姜求志,王金瑞.火力发电厂金属材料手册[M].北京:中国电力出版社,2000.
[2]周振丰,张文铖.焊接冶金与金属焊接性[M].北京:机械工业出版社,1988.
[3]DL/T 868-2011,焊接工艺评定规程.
[4]DL/T 753-2001,汽轮机铸钢件补焊技术导则.
[2]周振丰,张文铖.焊接冶金与金属焊接性[M].北京:机械工业出版社,1988.
[3]DL/T 868-2011,焊接工艺评定规程.
[4]DL/T 753-2001,汽轮机铸钢件补焊技术导则.