基于复合热源模型的CO2气体保护焊温度场模拟
Simulation of CO2 Temperature Field of Gas Shielded Arc Welding Based on Compound Welding Heat Source Model
仝维维1， 刘 松1， 石文超1， 胡小建1，2
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作者单位：1.合肥工业大学 材料科学与工程学院，安徽 合肥 230009；2.合肥工业大学 计算机网络系统研究所，安徽 合肥 230009
中文关键字：复合热源模型； 动态演变； 温度分布规律； 数值模拟
英文关键字：a compound welding heat source model; dynamic variation; regularities of temperature distribution; numerical simulation
中文摘要：实际短路过渡CO2气体保护焊接过程中，熔滴的热量对熔池温度场的分布会产生很重要的影响，当前焊接温度场模拟采用的热源模型中往往忽略了这一点。论文研究了CO2气体保护焊接的双椭球电弧热源模型以及将熔滴作为电弧之外的第二个作用热源模型，建立了适合于CO2焊的双椭球电弧热源与熔滴热源相叠加的一种新型复合热源模型；利用有限元软件ANSYS对低碳钢焊件的温度场及其不同位置的热循环曲线、纵向与横向温度场分布以及从起弧到宏观稳态的温度场动态演变规律进行了模拟和计算，并通过实验进行验证。研究结果表明，利用复合热源模型比单一的双椭球热源模型的模拟结果更接近于实验测试结果，验证了改进复合热源模型的准确性、有效性与实用性。
英文摘要：In CO2 gas shielded arc process of actual short-circuit transfer, the heat of droplet have significant impact on temperature field distribution of the molten pool, which is always ignored in the current welding temperature simulation. The double-ellipsoid heat source model and the droplet heat source model were analyzed respectively, and the new composite heat source model was set up based on double-ellipsoid heat source and heat droplet for CO2 arc welding of. The temperature field of low carbon steel was calculated using ANSYS finite element software, which is verified by the experiments. Thermal cycling curves at different positions, vertical and horizontal temperature distribution and dynamic evolution of the law were simulated and calculated. The results show that composite heat source model is better than single double-ellipsoid heat source model , the simulation results are closer to experimental results. The accuracy, validity and practicability of the composite heat source model are verified.