针对大型飞机高强铝合金壁板激光焊接T 型接头结构的角变形缺陷，提出了一种在蒙皮背部添加辅助热源的方法，有效地控制了角变形的产生。并基于有限元软件ABAQUS，开发了一种适用于这种焊接方法的焊接模型，同时考虑材料非线性、几何非线性和移动热源的热-弹-塑性有限元计算方法来模拟焊接过程中的热-力学耦合行为，分析焊接过程中的温度场、残余应力和焊接变形。同时，采用实验方法测量了加入辅助热源前后焊接接头的变形。结果表明，数值计算所得到的挠曲变形、角变形与实验测量结果十分吻合，验证了所开发的有限元计算方法的有效性。

To avoid the angular deformation of T joint in high-strength aluminum alloy plate of large aircraft, a method that equips skin back with auxiliary heat source (AHS) is proposed to prevent angular deformation effectively. A welding model applicable to this welding method is developed based on finite element software ABAQUS, the material and geometrical nonlinear finite element methods and the thermal-elastic-plastic finite element method for moving heat source are applied to simulate the thermodynamic coupling behavior as well as to analyze the temperature field, residual stress and welding deformation in welding process. The deformation of the weld joint before and after the addition of the AHS is measured by experimental method. The findings show that the flexural deflection and angular deformation achieved through numerical computation completely consist with the experimental result, which has proved the effectiveness of the finite element methods developed.