The coplanar double lap-joint is the weld type mainly used for the connection of skin and stringer. The welding deformation in the component will reduce fabrication accuracy and bearing capacity and the excessive welding deformation can even render the product unusable. In the present work, a thermal-elastic-plastic finite element model is developed to investigate the characteristics of welding deformation in the coplanar double lap-joint. The experiment is carried out to verify the accuracy of simulated results. The results of the simulation shows a good agreement with the experimental measurements. The influence of welding direction on welding deformation is studied by finite element analysis. Moreover the mechanism of deformation mode in the coplanar double lap-joint is discussed. The results show that the change of welding direction has different effects on the distribution of residual deformation. Through the analysis of simulation results, the deformation mode of the joint is similar to a concave-convex mode.

共面双搭接接头是主要用于蒙皮和桁条连接的焊接类型。组件中的焊接变形会降低制造精度和承载能力，过度的焊接变形甚至会使产品无法使用。在目前的工作中，建立了一个热弹塑性有限元模型来研究共面双搭接接头中焊接变形的特征。进行实验以验证模拟结果的准确性。仿真结果与实验测量结果吻合良好。通过有限元分析研究了焊接方向对焊接变形的影响。此外，还讨论了共面双搭接接头的变形模式机理。结果表明，焊接方向的变化对残余变形的分布有不同的影响。通过对仿真结果的分析，接头的变形模式类似于凹凸模式。