激光-等离子弧复合焊温度场的数值模拟

利用峰值热流随深度衰减的高斯体热源与高斯面热源相结合的方法,建立了激光等离子弧复合焊三维运动热源模型,重点考虑了由热源间距引起的激光束与等离子弧之间相互作用对热源模型的影响.基于所建立的热源模型对2 mm厚1420铝锂合金板的激光等离子弧复合焊接温度场进行了有限元分析,得到了不同热源间距条件下焊接区域的温度场分布.结果表明,仿真结果与试验结果相符合,证明了该热源模型是反映了客观实际的.此工作对于激光电弧复合焊接传热及工艺研究具有指导意义.

Numerical simulation on temperature field in laser-plasma arc hybrid welding

A three dimensional heat transfer model was put forward for the laser-plasma arc hybrid welding,which combines the mathematical models of two heat sources.The model of laser welding is Gaussian volume heat source and its peak heat flux decreases with depth,and the model of plasma arc is Gaussian plane heat source.The influence,induced by reaction between laser beam and plasma arc,was mainly studied in the model.Based on the model,the temperature distribution of 2 mm 1420 Al-Li alloy plate was obtained by FEM computation for laser-plasma arc hybrid welding in different distances of two heat sources.The hybrid welding experiments were conducted and show that the simulation results are well agreed with the experimental results.The result proves that the heat transfer model is more close to physical reality.This paper is instructive to research on heat transfer and process about laser-plasma arc hybrid welding.