超薄板焊接熔池流场数值模拟

Numerical Simulation of Flow Field of Ultra-thin Plate Weld Pool

为了研究超薄板焊接质量差的问题,根据流体力学和传热学原理,建立超薄板焊接熔池的二维数值分析模型。电弧热源模型采用高斯热源分布模型,模型考虑了超薄板固态金属的热传导、熔池与外部环境的对流辐射、熔池内部液态金属质点的热传递、材料的热物理性能参数部分随温度变化等因素。采用FLUENT对超薄板微束等离子焊接熔池模型进行求解,得出了熔池温度场、流场分布,并讨论了几种作用力对超薄板熔池流场的影响。研究结果表明表面张力是超薄板熔池内部液态金属流动的主要驱动力。

In order to study the problem of the poor quality of thin plate weldingand according to the theories of fluid mechanics and heat transfer,a two-dimensional numerical analysis model of the ultra-thin plate weld pool was established.Gaussian distribution model was used to describe the heat source of arc.Many factors were considered in the model,such as the thermal conductivity of solid metal of the ultra-thin plate,the convection and radiation between the ultra-thin plate puddle and external environment,the heat transfer of the liquid metal,some thermal physical properties of the material changed with temperature and so on.The temperature field and flow field were given,and the influence of the flow field of ultra-thin plate weld pool by several forces was discussed by using FLUENT to calculate the model of the ultra-thin plate weld pool of micro-plasma arc welding.