分段退焊对角接接头焊接残余应力及变形的影响

基于热-弹塑性有限元理论,以Abaqus软件为平台进行角接接头焊后残余应力及变形的分析,采用分段移动热源模型并利用Fortran语言开发热源子程序,分别采用直通焊和分段退焊两种方式进行角接接头焊接温度场、残余应力及变形的数值模拟分析。结果表明:横向变形是角接接头最主要的变形;角接接头焊接在焊缝端口处的残余应力为压应力,而在中间部位的残余应力为拉应力;分段退焊对横向残余应力的减弱作用较为明显,可以有效降低焊接后的变形及其应力。

Effect of backstep welding on residual stress and deformation of fillet joint

Based on the thermal elastoplastic finite element theory and Abaqus analysis software,the residual stress and deformation of fillet joint after welding are analyzed.The segmented moving heat source model is adopted and the heat source subroutine is developed by using Fortran language.The numerical simulation analysis of the welding temperature field,residual stress and deformation of the fillet joint is carried out by means of straight through welding and backstep welding respectively.The results show that the transverse deformation is the main deformation of the fillet joint;the residual stress at the weld end of the fillet joint is compressive stress,while the residual stress in the middle part is tensile stress;the transv-erse residual stress is obviously weakened by backstep welding,which can effectively reduce the deformation and stress after welding.