为了减小焊接变形，优化焊接工艺，需要准确预测激光焊接过程中温度场的分布情况，使用有限元模拟来预测温度场的分布是一种较好的方法。通过分析和总结激光焊接过程有限元模拟和理论分析的研究现状，以平板的焊接为例，建立了物理模型，并利用ABAQUS进行了激光焊接三维温度场的有限元模拟，讨论了模型的网格划分、边界条件及其模拟结果的后处理。模拟结果可以给出试件上任意一点任意时刻的温度情况，在激光功率为2000W、焊接速度为20mm／s的参数下模拟焊接2mm厚的A3钢板。结果表明，最高温度为3100℃左右，距焊接中心横向4mm处A点的最高温度为150℃左右，与相同参数条件下的实验结果基本一致，说明有限元模拟可以准确预测焊接过程的温度场分布情况。

In order to reduce the deformation of welding parts,optimize welding technics,it is necessary to forecast the thermal field of welding process. It is proved the finite element analysis(FEA)is a good method to resolve the problem. After reviewing the present research of the finite element simulation and theoretical calculation of the laser welding,a physical model for plate welding was built and its temperature field was simulated based on ABAQUS,the modeling and meshing method,boundary conditions and the simulation result were discussed. The simulation results can tell us the temperature of any point of the workpiece at any time. For a 2mm thick A3 steel plate,the simulation results are the highest temperature is 3100℃,the temperatme of the point A 4mm distant from the center point of the plate is 150℃ under the condition of 2000W laser power and 20mm/s welding speed,which are in good agreement with experimental results and prove that the FEA can be used to forecast the temperature field of welding process precisely.