Welding sequence optimization using local/global FEM analysis

• Ano de defesa: 2019
• Autor(a) principal: Gomes, Eduardo Vitor Meirelles Azevedo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia Oceânica; UFRJ
• Palavras-chave em Português: Welding sequence; Optimization; Welding simulation; CNPQ::ENGENHARIAS::ENGENHARIA NAVAL E OCEANICA::TECNOLOGIA DE CONSTRUCAO NAVAL E DE SISTEMAS OCEANICAS::SOLDAGEM DE ESTRUTURAS NAVAIS E OCEANICOS
• Link de acesso: http://hdl.handle.net/11422/13491

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.