焊板焊接变形及残余应力仿真分析
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中图分类号：TG6+ 文献标志码：A doi：0969/jissn006-06060004
文章编号：006-06（06）0-005-07
Simulation AnalysisofWeldingDeformationand Residual StressinWeldedPlates MO Binwei1，GUO Zhaoyuan23，XIAO Haojun¹，HU Xiaobing23， ZHANG Xuejian2.3
（1.Mechanical and Electrical Installation Branch，China WaterResourcesand Hydropower Seventh EngineeringBureau Co.，Ltd.，Meishan 62o860， China; 2.School ofMechanical Engineering，Sichuan University，Chengdu 61oo65，China; 3.Yibin Institute of Industrial Technology of Sichuan University，Yibin 644oo0， China）
Abstract ：This study investigates the deformation and residual stress induced by high heat input during the welding of thick plates（ 40-68mm .A thermo-mechanical coupled numerical model was developed to systematically analyze the combined effects of welding temperature （1600-2400∘C ），weldingspeed 2⋅6mm/s ）， and plate thickness on welding quality.The Goldak double-elipsoid heat source model was employed to characterize the arc heat distribution.By integrating the nonlinear Fourier heat conduction equation with a temperature-dependent elastic-plastic constitutiverelation，amulti-physics theoretical framework was established，encompassing heat conduction，elastic-plastic mechanics，and heat source dynamics.The dynamic simulation of the moving heat source was implemented on the ANsYS platform， where the birth and death element method was applied to model the molten pool activation.Mesh sensitivityand time-step controls were rigorously enforced to ensure computational accuracy.The simulation results reveal that the influence of welding temperature on deformation and residual stress exhibits significant nonlinearity.Higher welding speeds effectively mitigate heat accumulation.Plate thickness significantly influences theresponse.This study proposes dynamic optimization strategies tailored to diferent plate thicknesses.For thin plates，acombinationof high temperature and high speed is recommended， whereas thick plates require temperature control below 2000∘C combined with multi-layer welding techniques.
Key words ：Goldak double-ellipsoid heat source model;dynamic simulation ;birth and death element method
焊接工艺在现代制造与装配中占据着不可替代的地位，其通过热输入实现局部金属熔合，从而连接构件，形成整体结构。（剩余6641字）
