Performance Evaluation of a Welded Union for Application in Oil Platform Pipelines Willy Ank de Morais, Adriana Rey Rey, Ethiene Raunaimer Takakura, Felipe de Oliveira Barros, Jeferson Alves de Oliveira, Mauro André Guilherme Vieira Júnior, Wanderley Graça Rivela Júnior, Valmir Demarchi, Nestor Ferreira de Carvalho

Abstract

This 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.