Aplicação de técnicas ultrassônicas avançadas para inspeção e controle de qualidade na soldagem circunferencial de dutos

• Ano de defesa: 2022
• Autor(a) principal: Lima, Lincoln Hudson Acioli de Araujo
• Orientador(a): Martins, Carlos Otávio Damas
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Ciência e Engenharia de Materiais
• Palavras-chave em Português: Ciência dos materiais; Minérios; Transporte; Controle de qualidade; Minerodutos; Ensaios não destrutivos; Integridade estrutural
• Palavras-chave em Inglês: Pipelines; Non-destructive testing; Structural integrity
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: http://ri.ufs.br/jspui/handle/riufs/15858

Field (circumferential) welding is one of the technological bottlenecks related to pipeline assembly for ore transportation. Frequently, the choice between welding process and inspection for quality control determine the feasibility of using the structure. Since the beginnings of the use of steel pipes (~1940) the radiography has been used as a technique for circumferential welding inspection, ensuring portability, capacity for detecting volumetric defects and inspecting complex geometries. However, the use of harmful radiation to human health demands the adoption of strict safety plans and create the need for production stoppages in the vicinity where the test is being carried out, affecting the dynamics of the pipeline assembly process. In this work, the potential of applicability of the Advanced Ultrasonic inspection technique for the inspection of circumferential welds on pipelines made of API 5L Gr X70 steel was analyzed. In addition to increasing the analysis speed, ultrasonic techniques showed greater sensitivity than conventional radiography for the detection of internal defects. The advanced ultrasonic system showed a rejection rate of 28%, while the radiography rate was 6% for the 50 welds analyzed. These results show that several defects that were not detected in the radiographic test were identified in the advanced ultrasound, and despite generating more rework, there is the certainty of greater safety and the structural integrity of the pipeline.