ResumoEste trabalho objetiva a descrição dos diferentes desempenhos sob corrosão de uma junta soldada de uma tubulação de aço carbono obtida pelos consumíveis ER 70S-3 e ER 80S-Ni2, empregada em plataformas offshore. Amostras de tubos e chapas de aço carbono foram soldadas, através do processo TIG, empregando tais consumíveis, e submetidas a ensaio de corrosão acelerada por perda de massa em uma cuba com fluxo constante de água destilada e ácido sulfúrico a 98%. Posteriormente, as amostras foram caracterizadas de modo a quantificar as possíveis alterações nas características mecânicas, estruturais e superficiais. O resultado final foi que a corrosão ocasionada na junta com o consumível ER 80S-Ni2 apresentou características diferenciadas e mais deletérias ao desempenho estrutural do material, apesar de ser o consumível inicialmente recomendado para a aplicação. Palavras-chave: Corrosão, Perda de Massa, Consumíveis de Soldagem. CASE STUDY OF PERFORMANCE OF WELDED JOINTS FOR OFFSHORE APPLICATIONS AbstractThis work has as objective to describe the different performances under corrosion of a welded joint composed of a carbon steel pipe obtained with ER 70S-3 and ER 80S-Ni2 consumables and used at offshore platforms. Samples of carbon steel tubes and plates were welded through TIG process, using the different consumables, and were subjected to accelerated corrosion test by mass loss in a tank with constant flow of distilled water and 98% sulfuric acid. Subsequently, the samples were characterized in order to identify possible changes in the mechanical, structural and surface characteristics. As the result corrosion caused in the joint with the ER 80S-Ni2 consumable showed more deleterious to the structural performance of the material, despite being the consumable initially recommended for the application.
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