摘要
本文对激光穿透焊中涉及的传热与熔体流动特性进行了三维数值模拟研究,模拟中考虑了焊接速度、表面张力梯度(Marangoni对流)、浮力、熔池表面散热以及材料性质依赖于温度等复杂因素对焊接过程的影响,研究结果表明,焊接速度与Marangoni对流的影响最为重要,变物性效应也相当明显、预言的焊缝截面形状与实验观察一致,利用所得到的数值模拟结果,与其它途径获得的数据相配合,可以估计激光穿透焊的能量效率或蒸气孔尺寸。
A 3D modeling approach is proposed to account for the effects on the laser full - penetration welding characteristics of the welding speed, Morangoni convection, natural convection, melt surface heat loss as well as temperature- dependent material properties. It is shown that the welding speed and the Marangoni convection play critical roles in determining the heat transfer and melt flow in the welding process, and the variable property effect is appreciable. The predicted profile of the weld cross section agrees well with the experimental observation.
出处
《应用激光》
CSCD
北大核心
2002年第2期185-187,202,共4页
Applied Laser
基金
国家自然科学重点基金(编号59836220)
