Abstract：A welding finite element model for TA15 titanium alloy panel structure is developed. The influence of
welding sequence on the panel distortion is investigated by using thermo-elastic-plastic finite element method. The double
ellipsoid heat source models which are suitable for the site TIG penetration welding process are established through comparing
the weld cross-section and the residual stress of calculation and experiment. Furthermore, the distortion behaviors of
the panel structure in different welding sequences are simulated. The results show that the distortion of the middle part of
thin plate is severewhen the welding starts from one side, and the maximum distortion is 3.9mm. The distortion of the thin
plates is improved effectively by using the symmetrical welding sequence.
2017, 
