Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/doi/10.4322/2176-1523.1362
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

PROCESSO DE SOLDAGEM POR FRICÇÃO COM PINO CONSUMÍVEL SFPC APLICADO NO AÇO INOXIDÁVEL DUPLEX SAF 2205

FRICTION HYDRO PILLAR PROCESSING (FHPP) APLIED IN DUPLEX STAINLESS STEEL SAF 2205

Douglas Martinazzi; Cleber Rodrigo de Lima Lessa; Arlan Pacheco Figueiredo; Afonso Reguly

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Resumo

A presente investigação demonstra a utilização do processo de Soldagem por Fricção com Pino Consumível (SFPC), ou Friction Hydro Pillar Processing (FHPP), para reparar estruturas que contenham o aço inoxidável duplex SAF 2205 (AID UNS S31803) como material base. Para tanto, foi realizado um estudo preliminar relativo ao mesmo material reparado com o processo Tungsten Inert Gas (TIG). Após a obtenção das juntas reparadas em ambos os processos, estas passaram por rigorosa análise microestrutural e ensaios mecânicos para, dessa forma, qualificá-las através de critérios usuais recomendados em normas que regulamentam a utilização deste material no reparo de estruturas. Foram investigadas as propriedades metalúrgicas através de microscopia ótica e eletrônica de varredura, fractografia e EDS (energy dispersive x-ray), além de ensaios de corrosão. Já as propriedades mecânicas foram averiguadas através de ensaios de impacto, de dobramento e perfis de microdureza. Com o intuito de garantir a qualidade da junta soldada e, por sua vez, a segurança da estrutura reparada, o processo FHPP atendeu aos requisitos recomendados pelas normas DNV-RP-F112 e DNV-OS-F101.

Palavras-chave

Reparo de estruturas; Aço inoxidável duplex; FHPP; Fases intermetálicas.

Abstract

The present investigation demonstrates the use of the Friction Hydro Pillar Processing (FHPP) to repair structures containing SAF 2205 (AID UNS S31803) duplex stainless steel (DSS) as the base material. Therefore, a preliminary study was carried out regarding the same material repaired with the Tungsten Inert Gas process (TIG). After obtaining the repaired joints in both processes, they underwent rigorous microstructural analysis and mechanical tests to qualify them through the usual criteria recommended in standards which regulate the use of this material, the DSS SAF 2205, in the repair of structures. The metallurgical properties were investigated by optical and scanning electronic microscopy, fractography and EDS (energy dispersive x-ray) in addition to corrosion tests. The mechanical properties were investigated through impact tests, bending tests and microhardness profiles. With the purpose to guarantee the quality of the welded joint and, in turn, the safety of the repaired structure, the FHPP process met the requirements recommended by the standards DNV-RP-F112 and DNV-OS-F101.

Keywords

Structural repair; Duplex stainless steel; FHPP; Intermetallic phases.

Referências

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