小孔型层流电弧等离子体焊接温度场数值模拟
Numerical Simulation on Temperature Field in Keyhole Laminar Arc Plasma Welding
袁 洁， 朱 华， 姚 进
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作者单位：（四川大学 制造科学与工程学院, 四川 成都 610065）
中文关键字：小孔焊接； 层流电弧等离子体射流； 热源模型； 温度场； 数值模拟
英文关键字： keyhole welding; laminar plasma jet; heat source model; temperature field; numerical simulation
中文摘要：根据层流电弧等离子体射流的特性及小孔焊接的特点，建立了一种新型焊接热源模型，它利用衰减函数表征热流密度在工件厚度方向上的变化；针对焊接时焊缝处复杂的温度变化，采用非均匀网格对单元进行划分，在考虑材料热物理性参数随温度变化及相变潜热的情况下，对焊接过程进行了数值分析，并对小孔型层流电弧等离子体焊接工艺进行了探索研究。结果表明，控制焊接功率可以实现对小孔熔池最高温度的控制；而焊接速度对小孔熔池的形成有着决定性作用。
英文摘要：A new welding heat source model was established according to the characteristics of laminar plasma jet and keyhole welding, the heat density on the workpiece was defined by a decay function. Aiming at the complicated temperature field on the welding gap, the element was meshed unevenly. Considering the thermo-physical property of material changing with latent heat of phase transition and temperature, the welding process was numerically simulated. The model of keyhole laminar arc plasma welding was explored. The results show that welding power can affect the maximum temperature and welding velocity which play a key role in forming the keyhole welding pool.