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某电站锅炉水冷壁补焊层裂纹原因分析

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针对某电站锅炉水冷壁管补焊层裂纹的问题,通过宏观检查、无损探伤、成分分析、金相组织、硬度检验、力学性能检验和微区能谱分析等方法来查找原因,结果表明在焊缝金属中 C质量分数较高,造成晶界处的 S、P元素富集,形成低熔点共晶体,而这主要是由于在补焊过程中管样表面涂层未打磨干净所导致的,同时焊接热应力较高,最终在焊后沿晶界处产生焊接裂纹.
Causal Analysis of Cracks in Repair-welded Layer of Boiler Water-cooled Wall of an Actual Plant
This study mainly focused on seeking the causes of cracks in the repair-welded layer of a boiler's water-cooled wall in an actual power plant.The observations and tests employed in the study were macroscopic inspection,non-destruc-tive testing,composition analysis,metallographic analysis,hardness testing,and micro-area energy spectroscopy.It was found high mass fraction of C element in the welded seam metal,resulting in enriching of S and P elements at the grain boundary and the formation of low-melting-point eutectics.This could be attributed to the incomplete polishing of tube surface coating prior to the repair welding process.The low-melting-point eutectics and the high welding thermal stress to-gether led to welding cracks along the grain boundary.

water-cooled wallrepair-welded layerlow-melting-point eutecticwelding crack

肖厚全、程翔

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安徽省新能创业投资有限责任公司,安徽 合肥 230051

安徽新力电业科技咨询有限责任公司,安徽 合肥 230601

水冷壁 补焊层 低熔点共晶体 焊接裂纹

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(17)