高频直缝焊管焊接残余应力的三维有限元模拟研究

基于高频直缝焊管焊接热源的计算结果,综合考虑材料的物理属性随温度的高度非线性变化,以及高频加热的焊缝热影响区特有的温度分布规律,利用ANSYS有限元软件建立了高频直缝焊管焊接残余应力的三维有限元模型。获得了高频焊管温度场和残余应力场的分布规律,并对结果进行了分析。通过后处理模块,给出了焊缝部位残余应力的分布趋势,并分析了高频感应焊接残余应力的主要形成原因。发现焊缝附近的轴向残余应力较大,其中有些数值接近材料的屈服强度,而周向残余应力仅为材料屈服应力的1/3左右,径向残余应力数值较小,工程上可以忽略。

Study on 3D finite element simulation of high frequency welded pipe welding residual stress

Based on the high-frequency longitudinal welding heat calculations,ANSYS finite element software is used to establish the three-dimensional finite element model of welding residual stress.Physical properties of materials with highly non-linear changes in temperature and high-frequency heating of the weld heat affected zone-specific temperature distribution are considered.High-frequency welded pipe temperature field and residual stress field distribution are obtained,and the results are analyzed.Trends of the main causes of the high frequency induction welding residual stress are analyzed through the post-processing module.The axial residual stress of near the weld seam are larger,and some of the values are close to the material yield strength.Residual stress in the circumferential direction is one-third of the material yield stress,and radial residual stress value is smaller that in projects can be ignored.