热焊工艺对焊接残余应力影响的数值模拟
A Numerical Simulation on the Influences of Hot Welding Process to Welding Residual Stress
付建科，卢泽民，徐亮，黄晓辉
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作者单位：三峡大学机械与材料学院
中文关键字：热焊工艺；残余应力；有限元法；数值模拟
英文关键字：hot welding processing; residual stress; finite element analysis; numerical simulation
中文摘要：运用有限元分析软件ANSYS对25#钢对接接头分别在20℃、200℃、400℃、600℃和800℃的热焊工艺条件下进行焊接残余应力场的数值模拟。通过单元生死技术模拟焊缝的填充过程，得到了25#钢对接接头试板分别在该五种热焊工艺条件下焊接残余应力的大小及分布，并对计算结果进行了分析。结果表明：热焊工艺的加热温度越高，焊后产生的残余应力越小；残余应力降低的幅度在加热温度为400℃和600℃较明显。
英文摘要：This paper, making use of finite element analysis software ANSYS, conducted a numerical simulation about welding residual stress field to analyse the magnitude and distribution of welding residual stress of the 25# welded plates under room temperature 20℃、200℃、400℃、600℃ and 800℃ of hot welding processes. The paper researched the magnitude and distribution of 25#welding residual stress under five different heat welding process conditions by simulating the filling process of the welding with the "element birth and death" technology. The conclusions in this paper show that heat welding process of heating temperature is higher, the residual stress produced after welding is smaller. Residual stress reduction under 400℃ and 600℃ is very obvious.