物性参数对焊接温度场模拟计算的影响

Effect of physical parameters on numerical calculation of welding temperature field

数值模拟技术在焊接领域应用越来越广泛,对焊接领域生产应用和实验研究具有重要的工程使用价值及理论意义。文章利用双椭圆分布热源模型,对304不锈钢TIG焊接温度场进行计算,分析比热容(C_p)、热传导系数(λ)、热损失系数(α)三个物性参数在不同取值下对焊接温度场计算结果的影响。结果表明:比热容(C_p)的取值变化对焊接温度场计算结果影响最大,其熔深、熔宽变化值四组取值的计算结果分别为0.923、0.162 mm;热传导系数(λ)的影响次之,其熔深、熔宽变化值分别为0.522、0.057 mm;热损失系数(α)的四组取值的计算结果基本保持不变,其熔深、熔宽变化值分别为0.05、0.003 mm。

Numerical calculation of welding temperature field can provide more theoretical basis for production and experimental research,which has theoretical and practical significance. The paper takes 304 stainless steel as base material and takes the calculation of TIG welding temperature field as an example,The double elliptic distribution modes is used as heat source. Through changing thermal physical parameters values of the material（ thermal conductivity（λ）,specific heat capacity（ Cp ）,heat loss coefficient（α）） ,the effect of thermal physical parameters on the temperature field of welding are analyzed. The results show the influence of specific heat capacity on the calculation of welding temperature field is most. . In the four groups,the change values of weld depth and weld width are 0. 923 mm and 0. 162 mm;the influence of thermal conductivity is less,the change values of weld depth and weld width are 0. 522 mm and 0. 057 mm;the influence of heat loss coefficient is least,the calculated value is fairly constant,the change values of weld depth and weld width are 0. 05 mm and 0. 003 mm.