Abstract: The influence of welding sequence on residual stress and deformation of T-joint of Q690 steel was analyzed by using ABAQUS. The simulation models of temperature field and stress field of K-groove double-sided two-layer two pass welding was established. The calculation results show that the welding sequence has a certain influence on the residual stress and deformation. For the residual stress， the scheme 3， in which one side was welded first and then the other side， produced the minimum residual stress， and the high stress range of the weld area was also small. The overall stress level of alternative welding scheme 1 and scheme 2 was slightly larger， and the high stress range of the weld area was also larger. For welding residual deformation， the deformation of scheme 1 and scheme 2 was smaller， and the deformation of both sides was symmetrical， and the deformation of scheme 3 was the largest， accompanied by the overall tilt deformation.

Key words: welding sequence, two layers and two passes welding, numerical simulation, residual stress, welding deformation