【摘要】 在试验基础上,考虑了材料导热系数、对流换热系数、热焓等参数随温度的变化,通过有限元软件ANSYS建立激光薄板焊接的热源模型,模拟激光焊焊接过程,研究其温度场分布。对比试验和模拟结果,得出其焊缝形状基本一致。同时分析焊接电流、脉宽、频率对熔池熔深、熔宽的影响,结果显示,熔深、熔宽与电流成正比,与脉宽和频率成反比。对焊缝组织进行研究,发现焊缝主要由珠光体和铁素体构成,材料性能满足焊接要求。更多还原

【Abstract】 Considering of the change of material parameters such as the enthalpy,thermal conductivity,coefficient of convection along with the temperature,the heat source model of laser weld is established based on experiment and used to simulate the laser welding process by applying the finite element software ANSYS. The comparison between results of experiment and simulation shows that they have same weld bead. Then the influence of weld pool of current,pulse width,frequency on the width and depth is analyzed. The results show that the width and depth of weld pool are proportional to welding current,and are inversely proportional to pulse width and frequency. Through analyzing the organization of weld,it’s found that the organization is composed of ferrite and pearlite. The characteristics of materials meet the requirement of welding.更多还原