Computational Tool Development for Weld Sequence Planning in Major Assemblies

摘要

For the U.S. Navy, the use of computational simulations is prevalent for structural finite-element analysis but not for shop floor fabrication during construction. However, prevention and mitigation of welding-induced deformation creates a significant manufacturing challenge during fabrication of major ship assemblies, especially for thin-plate steel construction. The objective of this project was to improve weld sequence planning (WSP) capabilities for major ship assemblies through the development of a quick and user-friendly WSP software tool. An approximately 5x reduction in analysis time (from model setup through solve time) was realized through process automation, development of a weld joint database, and two-step weld sequence optimization algorithms. Physical testing of tank-like structures validated the computational tool, which established high correlation between measured and predicted distortion results. Sequence optimization analysis for an eggcrate structure showed a 43% reduction in maximum distortion from the two-step optimization process within the WSP tool. The end goal of this program is improved confidence in, and use of, computational weld mechanics techniques to more cost-effectively serve the U.S. Navy enterprise.