Repair and quality control of sealing lip weld for nuclear-grade sdtainless steel valve

CHEN Yingjie; DING Lijun; ZHANG Hongquan; WU Xiaofeng; ZUO Zhicheng

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Repair and quality control of sealing lip weld for nuclear-grade sdtainless steel valve
Vol. 49, Issue 4, Pages: 121-126(2019)
Published：2019
DOI：
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DOI：

CHEN Yingjie, DING Lijun, ZHANG Hongquan, et al. Repair and quality control of sealing lip weld for nuclear-grade sdtainless steel valve[J]. Eletric Welding Machine2019, 49(4): 121-126. DOI：

摘要

综合介绍核级不锈钢阀门密封唇焊的典型缺陷及成因

对影响焊接质量的重要维修工序进行了失效分析

制订了密封唇焊切割、结合面研磨、部件清洁及检查、阀体阀盖装配、焊接及焊后检查等维修关键工艺和质量控制技术要点

提出了在核电现场进行阀门密封唇焊维修的后续改进方向。

Abstract

This paper introduces the typical defects and causes of the sealing lip weld for nuclear-grade stainless steel valve

analyzes the failure of important repair processes that affect the welding quality. It has developed the key technical points of the repair and quality control for the valve sealing lip weld

including sealing lip weld cutting

mating surface grinding

component cleaning and inspection

valve body cap assembly

welding and post-weld inspection etc. It also proposed the follow-up improvement direction of the repair for the valve sealing lip weld on the nuclear power site.