Quality Control of Single-Side Welding with Double-Side Formation for Main Steam Super Pipeline in Nuclear Power Plant

HUANG Qinghui; XIANG Jiebo; ZHU Congbin

doi:10.7512/j.issn.1001-2303.2026.05.12

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Quality Control of Single-Side Welding with Double-Side Formation for Main Steam Super Pipeline in Nuclear Power Plant
Vol. 56, Issue 5, Pages: 102-107(2026)
Received：14 July 2024，

Revised：2024-08-12，

Published：20 May 2026
DOI： 10.7512/j.issn.1001-2303.2026.05.12
稿件说明：

移动端阅览

黄清辉，项杰波，朱从斌.核电站主蒸汽超级管道单面焊双面成形质量控制［J］.电焊机，2026，56（5）：102-107. DOI： 10.7512/j.issn.1001-2303.2026.05.12.

HUANG Qinghui, XIANG Jiebo, ZHU Congbin.Quality Control of Single-Side Welding with Double-Side Formation for Main Steam Super Pipeline in Nuclear Power Plant[J].Electric Welding Machine, 2026, 56(5): 102-107. DOI： 10.7512/j.issn.1001-2303.2026.05.12.

摘要

针对核电站主蒸汽超级管道壁厚大、坡口深窄、焊接填充量大、检测要求高等特点，分析其现场安装焊接施工难点，从焊接工艺控制、焊工技能管控、作业环境控制、焊后处理及检验控制四个方面提出质量控制措施。焊接工艺方面，采用细长喷嘴GTAW打底配合合理的操作与保护，利用预留窗口监控焊缝背面成形；焊工管控方面，通过资格筛选、一次合格率考核、专项特训及绩效激励保障焊工技能水平；环境控制方面，加强防风与除湿措施；焊后处理方面，严格后热及消应力热处理工艺，热处理前增加无损检验以提前识别缺陷。经上述控制措施，某核电站主蒸汽超级管道安装焊接一次合格率达100%，可为类似厚壁管道现场安装焊接质量控制提供借鉴。

Abstract

In view of the characteristics of the main steam super pipeline in nuclear power plants

such as large wall thickness

deep and narrow groove

large welding deposition volume and high inspection requirements

the difficulties of on-site installation welding construction were analyzed

and quality control measures were proposed from four aspects: welding process control

welder skill management

operating environment control

and post-weld treatment and inspection control. For welding process control

a slender nozzle was adopted for GTAW root pass with proper manipulation and shielding

and a reserved window was used to monitor the back-side formation of the weld. For welder skill management

welder qualification screening

primary qualification rate assessment

specialized training and performance-based incentive were implemented to ensure the welders' skill level. For operating environment control

wind shielding and dehumidification measures were strengthened. For post-weld treatment

post-heating and stress relief heat treatment processes were strictly controlled

and non-destructive testing was added before heat treatment for early defect identification. With the above control measures

the primary qualification rate of on-site installation welding for the main steam super pipeline in a nuclear power plant reached 100%

which can provide reference for quality control of on-site installation welding of similar thick-walled pipelines.

关键词

Keywords

references

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