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

Detalhes bibliográficos
Ano de defesa: 2022
Autor(a) principal: Lima, Lincoln Hudson Acioli de Araujo
Orientador(a): Martins, Carlos Otávio Damas
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Pós-Graduação em Ciência e Engenharia de Materiais
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://ri.ufs.br/jspui/handle/riufs/15858
Resumo: 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.