Research on the Process Technology of Manual Tungsten Argon Arc Welding for Repairing Stainless Steel Surfacing Layer on Sealing Surface

BAI Zhonglian; LI Shiyi; YE Yihai; LIU Chengdan; XUE Jingkai

doi:10.7512/j.issn.1001-2303.2025.07.11

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Research on the Process Technology of Manual Tungsten Argon Arc Welding for Repairing Stainless Steel Surfacing Layer on Sealing Surface
Vol. 55, Issue 7, Pages: 106-111(2025)
Received：15 July 2024，

Revised：2024-12-01，

Published：20 July 2025
DOI： 10.7512/j.issn.1001-2303.2025.07.11
稿件说明：

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柏忠炼，李诗易，叶义海，等.手工钨极氩弧焊修复密封面不锈钢堆焊层工艺技术研究［J］.电焊机，2025，55（7）：106-111. DOI： 10.7512/j.issn.1001-2303.2025.07.11.

BAI Zhonglian, LI Shiyi, YE Yihai, et al.Research on the Process Technology of Manual Tungsten Argon Arc Welding for Repairing Stainless Steel Surfacing Layer on Sealing Surface[J].Electric Welding Machine, 2025, 55(7): 106-111. DOI： 10.7512/j.issn.1001-2303.2025.07.11.

摘要

针对核反应堆压力容器密封面308L不锈钢堆焊层的局部修复需求，采用手工钨极氩弧焊技术，在SA508-III低合金钢基材的模拟件上开展不同深度（1 mm、2 mm、3 mm）的补焊试验，系统研究焊接热影响及焊趾区变形特征。结果表明：当不锈钢堆焊层总厚度为6 mm、焊接电流为90 A时，补焊深度达3 mm仍不会对下层低合金钢组织产生热影响，其微观结构保持块状铁素体与珠光体的原始形态，无硬脆马氏体生成；焊缝及热影响区显微硬度分布稳定（焊缝区约210 HV，不锈钢层约200 HV，低合金钢母材约120 HV）。但补焊后焊趾区存在最大19.614 μm的凹陷，需通过后续机加工消除以保证密封面平面度。本研究首次明确了手工钨极氩弧焊修复308L堆焊层的安全工艺窗口（≤3 mm补深/90 A电流），为核反应堆压力容器密封面的局部精准修复提供了关键技术依据。

Abstract

In response to the local repair needs of the 308L stainless steel cladding layer on the sealing surface of nuclear reactor pressure vessels

manual tungsten inert gas arc welding technology was employed. Welding tests were conducted on SA508-III low-alloy steel base material mock-ups at different depths (1 mm

2 mm

3 mm) to systematically study the thermal impact of welding and the deformation characteristics of the weld toe area. The results show that when the total thickness of the stainless steel cladding layer is 6 mm and the welding current is 90 A

a repair depth of up to 3 mm will not cause thermal effects on the underlying low-alloy steel structure. Its microstructure remains in the original form of blocky ferrite and pearlite

with no hard and brittle martensite formation. The microhardness distribution in the weld and heat-affected zone is stable (weld area approximately 210 HV

stainless steel layer approximately 200 HV

low-alloy steel base material approximately 120 HV). However

after repair

there is a maximum depression of 19.614 μm in the weld toe area

which needs to be eliminated by subsequent machining to ensure the flatness of the sealing surface. This study for the first time defines the safe process window for manual tungsten inert gas arc welding repair of the 308L cladding layer (≤3 mm repair depth / 90 A current)

providing a key technical basis for the precise local repair of the sealing surface of nuclear reactor pressure vessels.

关键词

Keywords

references

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