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Abstract(s)
Ensaios não destrutivos por ultrassom são amplamente utilizados na indústria, principalmente na avaliação de peças e estruturas mecânicas para a identificação de defeitos, corrosão, falhas ou imperfeições em soldas, constituindo uma das principais ferramentas do controlo da qualidade dos produtos. Este trabalho tem por objetivo avaliar a capacidade de deteção e dimensionamento de descontinuidades internas em juntas soldadas pelos processos de soldadura MIG, TIG e Friction Stir Welding através da inspeção por ultrassom com o uso da técnica de Phased Array. Foram efetuadas 8 inspeções ( 3 placas com juntas soldadas por TIG, 2 placas com juntas soldadas por MIG e 3 placas com juntas soldadas pelo processo de Friction Stir Welding), num total de 77 dimensionamentos dos defeitos realizados no software Tomoview. As placas soldadas por MIG exibiram a maioria dos defeitos na raiz da solda bem como algumas placas soldadas por TIG. A maioria dos defeitos detetados numa das placas soldada por TIG situaram-se no lado esquerdo do cordão. Nas placas soldadas por Friction Stir Welding foram encontrados o maior número de defeitos, sendo estes, maioritariamente, caraterizados por porosidades e apresentando as menores profundidades.
O ensaio por ultrassom Phased Array permitiu a deteção e caracterização, em dimensão e localização, dos defeitos encontrados, validando o sistema de inspeção utilizado.
Non-destructive tests by ultrasound are widely used in industry, mainly in the evaluation of parts and mechanical structures for the identification of defects, corrosion, failure or imperfections in welds, constituting one of the main tools of quality control of the products. The aim of this work is to evaluate the ability to detect and dimension internal discontinuities in joints welded by the MIG, TIG and Friction Stir Welding welding processes through ultrasonic inspection using the Phased Array technique. Eight inspections were carried out (3 plates with TIG welded joints, 2 MIG welded boards and 3 welded plates by welding friction joints), in a total of 77 defect dimensions performed in the Tomoview software. The MIG welded plates exhibited most of the weld root defects as well as some TIG welded plates. Most defects detected on one of the TIG-welded plates were on the left side of the bead. In the plates welded by Friction Stir Welding were the largest numbers of defects, these being, mostly, characterized by pores and presenting as people depths. The Phased Array ultrasound assay allowed the detection and characterization, in size and location, of the defects found, validating the surveillance system used.
Non-destructive tests by ultrasound are widely used in industry, mainly in the evaluation of parts and mechanical structures for the identification of defects, corrosion, failure or imperfections in welds, constituting one of the main tools of quality control of the products. The aim of this work is to evaluate the ability to detect and dimension internal discontinuities in joints welded by the MIG, TIG and Friction Stir Welding welding processes through ultrasonic inspection using the Phased Array technique. Eight inspections were carried out (3 plates with TIG welded joints, 2 MIG welded boards and 3 welded plates by welding friction joints), in a total of 77 defect dimensions performed in the Tomoview software. The MIG welded plates exhibited most of the weld root defects as well as some TIG welded plates. Most defects detected on one of the TIG-welded plates were on the left side of the bead. In the plates welded by Friction Stir Welding were the largest numbers of defects, these being, mostly, characterized by pores and presenting as people depths. The Phased Array ultrasound assay allowed the detection and characterization, in size and location, of the defects found, validating the surveillance system used.
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Ensaios não destrutivos Ultrassons Phased Array