INFLUENCE OF WELDING PARAMETERS IN CALCULATION OF RESIDUAL STRESS BY USING DCP METHOD IN NAVAL WELDED SHEETS

Leonardo Gadelha Tumajan Costa de Melo¹; Ricardo Artur Sanguinetti Ferreira¹; Catarina Esposito Mendes¹; Oscar Olimpio de Araujo Filho¹; Tiago Leite Rolim¹; Paternak de Souza Barros¹; Israel Lira Gonçalves¹; Euclides Apolinário Cabral de Pina¹

¹ Universidade Federal de Pernambuco

doi:10.20906/CPS/COB-2015-0691

Resumo

Residual stress classify commonly as the internal stress that remain in the material, even when no longer under influence of mechanical and thermal stresses. In welding, residual stresses are introduced by the high temperature gradient due to uneven heating and cooling. Heat flux in welding affects phase changing, becoming the great responsible for residual stress existence. By changing welding parameters in a MAG process, it changes current, voltage, joint aspects and therefore, heat input. In order to study the influence of welding parameters in residual stress, a displacement of coordinated points method was used. Sheets that dealt with higher heat input presented higher residual stresses values as well.

Palavras-chave: residual stress; welding parameters; displacement of coordinated points; naval welded sheets