基于建立的三维粗糙表面模型、瞬态有限元模型与热接触模型, 研究了激光功率、焊接速率和夹紧力对激光透射焊接聚碳酸酯接触热导率的影响, 并对仿真结果与实验结果进行了对比。研究结果表明, 随着焊接速率的增大, 接触热导率减小, 且减小趋慢; 随着激光功率的增大, 接触热导率增大, 且增大趋慢; 在0~0.25 MPa的夹紧力范围内, 随着激光功率的增大, 接触热导率逐渐增大; 在较高的激光功率和夹紧力以及较低的焊接速率下, 能够得到较大的接触热导率; 所建立的数学模型能较好地预测接触热导率。

Based on the established three-dimensional rough surface model, the transient finite element model and the thermal contact model, the effects of laser power, welding speed and clamp pressure on the contact thermal conductivity of laser transmission welding of polycarbonate are studied, and the comparison between simulated and experimental results is also conducted. The study results show that, with the increase of the welding speed, the contact thermal conductivity decreases and the decrease becomes slow. With the increase of laser power, the contact thermal conductivity increases and the increase becomes slow. When the clamp pressure is within the range of 0-0.25 MPa, the contact thermal conductivity increases with the increase of the laser power. A relatively high contact thermal conductivity can be achieved when the conditions of high laser power, low welding speed and high clamp pressure are satisfied. The contact thermal conductivity can be well predicted based on the built mathematical models.