摘要
为准确表征海底管道焊接接头的应力腐蚀特性与规律,保障海底管道安全运行,利用COMSOL Multiphysics多物理场耦合技术,自定义焊接接头应力应变与腐蚀耦合关系,研究海底管道在恒定内外压及不同轴向拉伸应变下焊接接头腐蚀行为响应规律。研究结果表明:发生电偶腐蚀时,焊接接头各区域的腐蚀倾向由大到小依次为热影响区、焊缝、母材,其腐蚀净电流密度降序排列为热影响区、母材、焊缝,且两项特性均随弹性拉伸应变增强而增大。塑性拉伸应变加剧电偶腐蚀,热影响区与焊缝交界面区域存在最大电流密度值,成为焊接接头腐蚀最严重区域。
In order to accurately characterize the stress corrosion characteristics and rules of welded joints of submarine pipelines and ensure the safe operation of submarine pipelines,this paper used COMSOL Multiphysics coupling technology to define the coupling relationship between stress strain and corrosion of welded joints.The corrosion behavior response rule of welded joints of submarine pipelines under constant internal and external pressure and different coaxial tensile strain was studied.The results show that when galvanic corrosion occurs,the corrosion tendency in each area of the welded joint is the heat affected zone,the weld and the base material,and the net corrosion current density is the heat affected zone,the base material and the weld in descending order,and both characteristics increase with the increase of elastic tensile strain.The plastic tensile strain intensifies the galvanic corrosion,and the maximum current density exists at the interface between the heat affected zone and the weld,which becomes the most serious corrosion area of the welded joint.
作者
诸浩君
张大伟
张涛
ZHU Haojun;ZHANG Dawei;ZHANG Tao(Shanghai Haiwan New Energy Wind Power Co.,Ltd.;Qingdao Hanhe Cable Co.,Ltd.)
出处
《管道技术与设备》
2025年第2期50-58,共9页
Pipeline Technique and Equipment
基金
山东省重点研发计划(重大科技创新工程)(2023CXGC010409)。
