Influence of Welding Sequence on the Welding Residual Distortion for Laser Welded Sandwich Structures Used in Shipbuilding Industry

摘要

Based on the classical theory of welding structure, the welding residual distortion for laser welded sandwich structure was simulated using finite element method (FEM). The results showed that welding front all and then to back may lead to a relatively high welding residual distortion. The maximum distortion in Z-direction is higher than 0.5 mm. The distortion can be obviously decreased when the welding sequence is welded from front to back and then back to front alternatively. The maximum distortion in Z-direction is less than 0.1 mm.