Key Welding Technology for Advanced Nuclear Reactor Heat Exchangers

JIANG Yuchen; HE Bing; LIU Xiaohong; JIANG Guoyan; LI En; DAI Guangming

doi:10.7512/j.issn.1001-2303.2026.06.03

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Key Welding Technology for Advanced Nuclear Reactor Heat Exchangers
Vol. 56, Issue 6, Pages: 30-36(2026)
Received：26 June 2025，

Revised：2025-08-23，

Published：20 June 2026
DOI： 10.7512/j.issn.1001-2303.2026.06.03
稿件说明：

移动端阅览

蒋宇晨，何冰，刘晓鸿，等.先进核电堆型热交换器关键焊接技术［J］.电焊机，2026，56（6）：30-36. DOI： 10.7512/j.issn.1001-2303.2026.06.03.

JIANG Yuchen, HE Bing, LIU Xiaohong, et al.Key Welding Technology for Advanced Nuclear Reactor Heat Exchangers[J].Electric Welding Machine, 2026, 56(6): 30-36. DOI： 10.7512/j.issn.1001-2303.2026.06.03.

摘要

为突破我国先进核电堆型热交换器一体化设计与商用化的核心制造瓶颈，本研究聚焦自主设计的新型热交换器，系统解析其创新结构、材料选型及工艺要求，重点攻克高可靠焊接技术难题。针对高温钠环境与复杂结构特性，通过制造装备创新研发、抗钠腐蚀焊接接头工艺开发、焊接过程检测技术等方法，成功开发了5项核心焊接技术：开槽式管子/管板封口焊焊接工艺、迷宫密封耐磨层堆焊工艺、管板-套筒装焊几何精度与尺寸变形控制措施、小径薄壁管全位置对接焊工艺、大型多层薄壁奥氏体不锈钢低变形高效不锈钢焊接工艺，形成全流程焊接质量控制体系。研究成果填补国内核级热交换器精密焊接领域空白，建立了自主化工艺规范与制造标准，为同类设备标准化设计及工程化应用提供核心技术支撑，有力推动国家重大装备自主化战略实施。

Abstract

To break through the core manufacturing bottleneck of integrated design and commercialization of advanced nuclear power plant heat exchangers in China

this research focuses on the newly designed heat exchanger with independent intellectual property rights

systematically analyzes its innovative structure

material selection and process requirements

and focuses on solving the technical problems of high-reliability welding. In response to the high-temperature sodium environment and complex structural characteristics

through the innovative development of manufacturing equipment

the development of anti-sodium corrosion welding joint processes

and the detection technology of the welding process

five core welding technologies have been successfully developed: the slot-type tube/tube sheet sealing weld welding process

the labyrinth seal wear-resistant layer surfacing welding process

the control measures for the geometric accuracy and dimensional deformation of the tube sheet - sleeve assembly and welding

the all-position butt welding process for small-diameter thin-walled tubes

and the low-deformation and high-efficiency stainless steel welding process for large multi-layer thin-walled austenitic stainless steel. A full-process welding quality control system has been formed. The research results fill the gap in the field of precision welding of nuclear-grade heat exchangers in China

establish independent process specifications and manufacturing standards

provide core technical support for the standardized design and engineering application of similar equipment

and effectively promote the implementation of the national major equipment independentization strategy.

关键词

Keywords

references

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