基于ABAQUS的EH36海工钢气电立焊数值模拟研究  

Numerical Simulation of Electro-gas Welding of EH36 Offshore Steel Based on ABAQUS

作　　者：江坤 刘芳芳 蒋健博 厉文墨 JIANG Kun;LIU Fangfang;JIANG Jianbo;LI Wenmo(Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102200

出　　处：《热加工工艺》2024年第1期84-89,共6页Hot Working Technology

摘　　要：为研究EH36海工钢气电立焊过程,以有限元软件ABAQUS为平台,建立了用于计算气电立焊焊接温度场和应力场的有限元模型。采用椭球体热源与高斯面热源的组合热源模型并通过DFLUX子程序实现,通过生死单元技术来控制焊缝的填充加载,通过实测得到EH36钢的热物理性能参数,模拟了气电立焊焊接过程。进行了焊接试验,并通过热电偶测得了焊板典型位置的热循环曲线。结果表明:焊后横向残余应力在立板的中间区域为拉应力,在其余区域为压应力。纵向残余应力在焊缝及其附近区域表现为较大的拉应力,而远离焊缝拉应力迅速衰减并过渡为压应力;计算得到的热循环曲线和焊缝形状与实际基本一致,表明了本文建立的气电立焊焊接模型的准确性。In order to study the electro-gas welding process of EH36 offshore steel,a finite element model for calculating the welding temperature and stress fields of electro-gas welding was established by using finite element software ABAQUS.A combined heat source with an ellipsoid heat source and a Gaussian surface heat source was used,which was realized by using DFLUX subroutine.The weld filling was controlled by birth and death element technology.The physical parameters of the EH36 steel were obtained through experiments.Finally,the electro-gas welding process was simulated.The welding test was carried out,and the thermal cycle curves of typical positions of the plate were measured by thermocouple.The results show that the transverse residual stress after welding is tensile stress in the middle area of the vetical plate,and that is compressive stress in the remaining area.Longitudinal residual stress is large tensile stress in the weld and its nearby area,and the tensile stress rapidly decreases and transits to compressive stress far away from the weld.The calculated thermal cycle curve and the weld shape are consistent with the experimental results,which shows the accuracy of the model established in this paper.

关 键 词：气电立焊 热源模型 热循环曲线 

分 类 号：TG402[金属学及工艺—焊接] TG448