Welding residual plastic strains and residual stresses are the product of complicated
nonlinear behaviors of the structures during welding. The residual strains and stresses for stiffened
stainless steel structure and welding fatigue analysis are studied in this paper. The
three-dimensional transient temperature field is analyzed by FEM first. Doing the welding
experiment for fundamental model is to verify the numerical results, the infrared thermograph is
used to follow and record the whole process. The results of FEM are supported by experimental
data. Then, the elastic-plastic-model is established to analyze the residual strains and stresses.
Based on the stresses, loading and fatigue factors, according to Miner fatigue damage law, some
fatigue behaviors such as fatigue life and remaining life are obtained.