304不锈钢管道环焊缝热力耦合有限元模拟

 为合理控制304不锈钢管道环焊缝焊接残余应力，运用有限元软件ABAQUS建立二维轴对称壳单元模型，模拟管道环形焊缝的焊接过程，获取了304不锈钢管道环焊缝温度场和应力场的分布规律。在焊件上表面提取了特征点的热循环曲线，同时获取了焊接过程中焊接接头径向某一截面特征点同一时刻的温度场分布特征。对管道环形焊缝内外表面残余应力的分布规律研究表明，管道焊缝及靠近焊缝区，内表面的轴向残余应力是拉应力，外表面的轴向残余应力是压应力；内外表面的横向残余应力都是拉应力，而径向残余应力主要是压应力，上表面的余高两侧热影响区受到少许拉应力作用。

Thermo-mechanical Coupling Finite Element Simulation of 304 Stainless Steel Pipe Girth Weld

 In order to reasonably control the welding residual stress of 304 stainless steel pipe girth weld, a two-dimensional axisymmetric shell element model was established by using numerical simulation software ABAQUS. The distribution of temperature field and stress field of 304 stainless steel pipe girth weld was obtained. The thermal cycle curve of the feature points is extracted on the upper surface of the weldment, and the temperature field distribution characteristics of a radial section feature point in the welding process are obtained. The distribution law of residual stress on the inner and outer surface of girth weld shows that the axial residual stress on the inner surface is tensile stress, while the axial residual stress on the outer surface is compressive stress. The transverse residual stress on the inner and outer surfaces is tensile stress, while the radial residual stress is mainly compressive stress. The heat affected zone on both sides of the reinforcement of the upper surface is affected by little tensile stress.