基于体热源的激光透射焊接PA66温度场模拟

目前国内激光透射焊接温度场模拟大多采用面热源,无法考虑炭黑含量的影响。为此,文中使用Ansys的APDL语言构建了基于体热源的三维瞬态有限元模型,采用该模型对PA66的激光透射焊接温度场进行了模拟,并将模拟结果与面热源下的模拟结果、实验结果分别进行对比。结果发现,由体热源模型模拟得到的焊缝热影响区形貌与实际热影响区形貌较为接近,模型预测的热影响区尺寸也与实测值保持着较高的吻合度,表明体热源能较好地表征炭黑含量对焊接结果的影响,并在温度场模拟方面明显优于面热源。

Temperature Field Simulation of Laser Transmission Welding PA66 Based on Volumetric Heat Source

The majority of temperature field models of laser transmission welding in China are established based on surface heat source without the influence of carbon black in consideration.A 3D transient finite element model based on volumetric heat source is presented using APDL language of ANSYS to simulate the temperature field of laser transmission welding PA66.The simulated results are compared with that of surface heat source model and experimental results respectively.The results indicate that the simulated shape of heat affect zone (HAZ) under volumetric heat source agrees very well with the experimental observation,and the dimensions of HAZ predicted by simulation also maintains relatively high accuracy.It is evident that volumetric heat source has obvious advantages over surface heat source in temperature filed simulation and can be used to characterize the influence of carbon black very well.