Complex welding repair of thickness thinning defect under stainless steel cladding of reactor pressure vessel

CHEN Liang; WANG He

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Complex welding repair of thickness thinning defect under stainless steel cladding of reactor pressure vessel
Vol. 48, Issue 9, Pages: 71-75(2018)
Published：2018
DOI：
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DOI：

CHEN Liang, WANG He. Complex welding repair of thickness thinning defect under stainless steel cladding of reactor pressure vessel[J]. Eletric Welding Machine2018, 48(9): 71-75. DOI：

摘要

针对反应堆压力容器(RPV)内壁不锈钢堆焊完成后

因超标缺陷造成低合金钢母材大范围减薄导致设备结构完整性分析不满足要求的情况

设计了低合金钢母材加不锈钢复合补焊方案

并基于反应堆压力容器本体母材(16MND5)试板

采用手工电弧焊完成了低合金钢加不锈钢模拟复合补焊及性能验证试验分析。结果表明

母材与补焊区域熔合良好

返修区域化学成分、微观金相、腐蚀试验、弯曲试验、硬度试验及无损检验结果满足验收要求。

Abstract

After completion of stainless steel cladding on low alloy steel of reactor pressure vessel

extensive thinning of base material due to excessive defects may induce the structural integrity analysis dissatisfy the requirements. This study completed the design of complex welding repair of low alloy steel base metal and stainless steel cladding

and based on the test plate of reactor pressure vessel base metal（16 MND5）

the simulate welding repair process via manual arc welding and property analysis have been conducted. The analysis show that the base metal and welding repair area are well-fused

and the chemical composition

micro metallography

corrosion

bending

hardness test and non-destructive test results of the welding repair meet the acceptance requirements.