2219铝合金板材双道TIG焊接残余应力与变形的有限元预测

Finite Element Prediction of Residual Stress and Deformation Induced by Double-Pass TIG Welding of Al 2219 Plate.

作者信息

Ahmad Abdulrahaman Shuaibu, Wu Yunxin, Gong Hai, Nie Lin

机构信息

College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2019 Jul 12;12(14):2251. doi: 10.3390/ma12142251.

DOI:10.3390/ma12142251

PMID:31336961

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6678515/

Abstract

Finite element (FE) analysis of welding residual stress and deformation is one of the essential stages in the manufacturing process of mechanical structures and parts. It aids in reducing the production cost, minimizing errors, and optimizing the manufactured component. This paper presents a numerical prediction of residual stress and deformation induced by two-pass TIG welding of Al 2219 plates. The FE model was developed using ABAQUS and FORTRAN packages, Goldak's heat source model was implemented by coding the nonuniform distributed flux (DFLUX) in user subroutine to represent the ellipsoidal moving weld torch, having front and rear power density distribution. Radiation and convection heat losses were taken into account. The mechanical boundary condition was applied to prevent the model from rotation and displacement in all directions while allowing material deformation. The FE model was experimentally validated and the compared results show good agreement with average variations of 18.8% and 17.4% in residual stresses and deformation, respectively.

摘要

焊接残余应力和变形的有限元（FE）分析是机械结构和零件制造过程中的关键环节之一。它有助于降低生产成本、减少误差并优化制造部件。本文给出了Al 2219板材双道TIG焊接引起的残余应力和变形的数值预测。有限元模型使用ABAQUS和FORTRAN软件包开发，通过在用户子程序中编写非均匀分布通量（DFLUX）来实现Goldak热源模型，以表示具有前后功率密度分布的椭圆形移动焊炬。考虑了辐射和对流热损失。施加了机械边界条件以防止模型在各个方向上旋转和位移，同时允许材料变形。有限元模型经过实验验证，比较结果表明残余应力和变形的平均变化分别为18.8%和17.4%，吻合良好。