Influence of Multiple Welding Repairs on the Properties of SA-533BCL1 Steel Welded Joints

Yang MING; Yongfang JIA; Mingjin WANG; Yong WANG

doi:10.7512/j.issn.1001-2303.2022.07.17

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Influence of Multiple Welding Repairs on the Properties of SA-533BCL1 Steel Welded Joints
Vol. 52, Issue 7, Pages: 116-120(2022)
DOI： 10.7512/j.issn.1001-2303.2022.07.17

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明阳，贾永方，王名锦，等.多次返修次数对SA-533GrBCL1钢焊接接头组织和性能的影响［J］.电焊机，2022，52（7）：116-120.

MING Yang, JIA Yongfang, WANG Mingjin, et al.Influence of Multiple Welding Repairs on the Properties of SA-533BCL1 Steel Welded Joints[J].Electric Welding Machine, 2022, 52(7): 116-120.
明阳，贾永方，王名锦，等.多次返修次数对SA-533GrBCL1钢焊接接头组织和性能的影响［J］.电焊机，2022，52（7）：116-120. DOI： 10.7512/j.issn.1001-2303.2022.07.17.

MING Yang, JIA Yongfang, WANG Mingjin, et al.Influence of Multiple Welding Repairs on the Properties of SA-533BCL1 Steel Welded Joints[J].Electric Welding Machine, 2022, 52(7): 116-120. DOI： 10.7512/j.issn.1001-2303.2022.07.17.

摘要

SA-533GrBCL1钢是核电站建设中使用较多的一种钢材，有一定的核级安全要求，为验证SA-533GrBCL1焊接稳定性。特开展焊条电弧焊多次返修对压力容器用钢板SA-533GrBCL1接头性能的影响研究，通过拉伸、弯曲、低温冲击和硬度试验等性能试验，分析多次返修（≤5次）的焊接接头不同位置的金相组织分布和变化规律。结果表明，SA-533GrBCL1焊接接头经过多次返修或返修焊后热处理，其接头力学性能未见异常变化，各项性能指标符合相关制造规范要求，但多次返修后热影响区较未返修接头存在软化，焊后热处理降解并平化了焊接接头各区域的硬度差异。焊缝金属和焊后热处理熔合区微观上表现为铁素体组织萌生针状、块状、片状形态转变，并伴生少量粒状贝氏体、珠光体组织形态，表现出冲击韧性值呈现分散性。

Abstract

SA-533GrBCL1 steel is a kind of steel that is widely used in the construction of nuclear power plants. It has certain nuclear safety requirements to verify the welding stability of SA-533GrBCL1. Specially carry out research on the influence of electrode arc welding multiple repairs on the performance of steel plate SA-533GrBCL1 for pressure vessels. Through performance tests such as tensile, bending, low temperature impact and hardness tests, the different welding joints of multiple repairs (≤5 times) are analyzed. The metallographic structure distribution and variation law of the location. The results show that the mechanical properties of SA-533GrBCL1 welded joints have not changed abnormally after repeated repairs or post-weld heat treatment, and the performance indicators meet the requirements of relevant manufacturing specifications, but the heat-affected zone exists after repeated repairs compared with unrepaired joints. Softening, post-weld heat treatment degrades and smoothes out hardness differences in various areas of the welded joint. Microscopically, the weld metal and the fusion zone of the post-weld heat treatment show that the ferrite structure initiates acicular, block, and flake morphology transformation, and is accompanied by a small amount of granular bainite and pearlite structure, showing that the impact toughness value is dispersive.

关键词

SA-533GrBCL1返修次数力学性能金相组织

Keywords

SA-533BCL1multiple repairsmechanical propertiesmetallographic structure

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