压力容器2025，Vol.42Issue(2)：62-70,9.DOI:10.3969/j.issn.1001-4837.2025.02.008
Q345R氮气储罐焊缝开裂原因分析及建议
Cracking cause analysis and strategies for weld cracking in Q345R nitrogen storage vessels
摘要
Abstract
To address the weld failure issue in a Q345R nitrogen storage vessel,this study systematically investigated the formation and propagation mechanisms of weld cracks through macro-morphological analysis,residual stress testing,computed tomography(CT),and other physicochemical testing techniques.Results indicate that the failure originated from hot cracks formed in the weld zone during manufacturing,which propagated to the surface under combined effects of residual tensile stress(382 MPa maximum)and internal pressure loading.The crack region exhibited intergranular brittle fracture features and spherical silicate oxide inclusions,with weld hardness significantly higher than the base metal.It is recommended to prevent the formation of welding hot cracks by properly selecting harmful element content in welding materials and optimizing welding process parameters.For B-type circumferential welds with wall thickness exceeding 50 mm,phased array ultrasonic testing(PAUT)is prioritized to improve crack defect detection rates,supplemented by additional inspections for blind zones.关键词
Q345R储罐/焊缝失效/裂纹/残余应力Key words
Q345R storage vessel/weld failure/cracks/residual stress分类
机械工程引用本文复制引用
宋利滨,朱国栋..Q345R氮气储罐焊缝开裂原因分析及建议[J].压力容器,2025,42(2):62-70,9.基金项目
国家重点研发计划项目(2024YFC3013703) （2024YFC3013703）
