Welding sequence optimization using local/global FEM analysis

Abstract

The fusion welding processes are largely employed in the naval industry, mainly due to its productivity and obtained water tightness. However, some problems may be generated due to the high-temperature gradient that is imposed by the welding process, as distortions and residual stresses. Distortions may reach elevated values, making difficult the future assembly of pieces, panels or blocks. Therefore, production becomes slower and consequently elevating costs. The objective of this project is the reduction of distortions on stiffened plates by optimization of the welding sequence. Using a genetic algorithm for the optimization and finite element analysis for the prediction of induced distortions was shown that specific welding sequences might considerably reduce distortions. Additionally, optimizations may be feasible in the industry when considered the time spent on the optimization of a single panel.