焊接顺序对AH36船用高强钢焊接残余应力及其释放的影响研究

Study on the effect of welding sequence on welding residual stress and its release of AH36 marine high-strength steel

采用热弹塑性有限元方法对AH36船用高强度钢对接焊的残余应力进行数值计算,获得了焊缝区域两条路径方向上的纵向残余应力和横向残余应力分布。分析焊接过程中不同焊接顺序对焊接残余应力及其释放的影响。计算结果表明:两条路径上的焊接残余应力受焊接顺序影响较大;工况一和工况四的初始横向和纵向焊接残余应力较小;加载50次拉伸循环载荷之后,工况一的横向和纵向焊接残余应力释放率最大,应力数值最小。

In this paper,the thermo-elastic-plastic finite element method is used to calculate the residual stress of butt welding of AH36 marine high-strength steel.The longitudinal and transverse residual stress distributions in the directions of two paths near the weld zone are obtained.The effects of different welding sequences on the welding residual stress and its release during the welding process are analyzed.The calculation results show that the welding residual stresses on the two paths are greatly affected by the welding sequence.The initial transverse and longitudinal welding residual stresses of working condition one and working condition four are small.After applying 50 times of tensile cycle load,the release rate of longitudinal and transverse residual stresses of working condition one is the largest and the stress value is the smallest.