Application of a Soft Root Technique to the Welding of High Strength Steels (HSS)

Souza, Gabriel Barbosa Coutinho Freire de

Repositório Institucional da Produção Científica da Marinha do Brasil (RI-MB)

Use este identificador para citar ou linkar para este item: https://hdl.handle.net/ripcmb/848020

Registro completo de metadados

Campo DC	Valor	Idioma
dc.contributor.advisor	Ganguly, Supriyo	-
dc.contributor.advisor	Barritte, Graeme	-
dc.contributor.author	Souza, Gabriel Barbosa Coutinho Freire de	-
dc.date.accessioned	2025-11-24T18:51:33Z	-
dc.date.available	2025-11-24T18:51:33Z	-
dc.date.issued	2025-11	-
dc.identifier.uri	https://repositorio.marinha.mil.br/handle/ripcmb/848020	-
dc.description	The increasing use of High-Strength Steels (HSS) in structural applications poses significant challenges to welding, particularly in selecting compatible filler metals with the same level of strength and in reducing the likelihood of cold cracking. Among the strategies proposed to address these issues, the use of a “soft root”, a root pass made with a lower-strength filler metal, has been studied. This research investigates the effects of applying a soft root configuration in the welding of a HSS (S690). The study explores the use of two different filler metals: a lower-strength wire applied to the root and a higher-strength wire used in the fill and cap passes. The experimental set included tensile tests, Charpy impact tests, hardness surveys, Scanning Electron Microscopy (SEM), and metallographic analysis to evaluate joint performance. The results indicate that the soft root configurations, even with mismatch ratios as low as 0.57, did not compromise mechanical integrity, reducing hardness and increasing ductility. Samples with a soft root did not behave as unmatched joints, outperforming the predictions of Eurocode 3 (EC3) curve. These findings support the strategy as a viable design alternative for welding HSS, especially in scenarios where matching or overmatching consumables and cold cracking are concerns. More research is recommended to unlock the full potential of this technique.	pt_BR
dc.language.iso	en_US	pt_BR
dc.publisher	Cranfield University	pt_BR
dc.rights	openAccess	pt_BR
dc.subject	Undermatched welds	pt_BR
dc.subject	Soft root technique	pt_BR
dc.subject	HSS welding	pt_BR
dc.subject	Weld metal mismatch	pt_BR
dc.subject	Cold cracking mitigation	pt_BR
dc.subject	Fracture toughness	pt_BR
dc.subject	S690 steel	pt_BR
dc.title	Application of a Soft Root Technique to the Welding of High Strength Steels (HSS)	pt_BR
dc.type	masterThesis	pt_BR
dc.subject.dgpm	Engenharia nuclear	pt_BR
dc.subject.setorMarinha	Diretoria-Geral do Desenvolvimento Nuclear e Tecnologia da Marinha (DGDNTM)	pt_BR
Aparece nas coleções:	Engenharia Naval: Coleção de Dissertações

Arquivos associados a este item:

Arquivo	Descrição	Tamanho	Formato
Thesis_Gabriel.pdf		49,63 MB	Adobe PDF	Visualizar/Abrir

Mostrar registro simples do item Visualizar estatísticas