Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.1008
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

EFEITO DA SOLDAGEM CIRCUNFERENCIAL DE TUBOS API 5L X65MS, X70MS E X80MS NA ZAC E NO METAL DE SOLDA

EFFECT OF GIRTH WELDING AT THE WELD METAL AND HAZ OF API 5L X65MS, X70MS AND X80MS PIPES

Batista, Gilmar Zacca; Carvalho, Leonardo da Paixão; Silva, Marcinei Santos da; Souza, Marcos Ponciano

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Resumo

Este trabalho analisa a tenacidade e dureza do metal de solda e ZAC da solda circunferencial de tubos API 5L X65, X70 e X80 para serviço ácido. Os tubos de elevada resistência, fabricados para serviço ácido, apresentam grande desafio para a soldagem. Os consumíveis e processos devem ser capazes de produzir uma junta soldada de alta resistência, baixa dureza e elevada tenacidade. O objetivo deste estudo foi identificar problemas de amolecimento ou fragilização da ZAC e verificar se a elevada resistência não prejudica a tenacidade e dureza do metal de solda. A metodologia incluiu a soldagem circunferencial e ensaios de dureza e CTOD. Os resultados mostraram que o metal de solda e a ZAC dos graus X65 e X70, são adequadas para o emprego em dutos terrestres. Observou-se um amolecimento na ZAC dos graus X70 e X80 que, de acordo com a literatura, não é crítico para projetos baseados em tensão. Para o grau X80, o CTOD da ZAC ficou abaixo do valor mínimo desejado, indicando que pode ter ocorrido a formação de zonas frágeis localizadas e resultando na necessidade de estudos complementares para ajustar os parâmetros de soldagem. Os resultados deste estudo servem como base para uma futura aplicação destes materiais em campo.

Palavras-chave

Soldagem circunferencial, X70, X80, Serviço ácido.

Abstract

This paper analyses the HAZ and weld metal toughness and hardness of sour service API 5L X65, X70 and X80 girth welds. The high strength steel pipes produced for sour service introduce a big challenge for welding. The process and consumables applied should be able to produce a high strength, high toughness and low hardness welded joint. The purpose of this study was identify HAZ softening and embrittlement and whether the high strength does not affect the weld metal hardness and toughness. The methodology includes pipe girth welding, CTOD and hardness tests. Results showed that HAZ and weld metal of grade X65 and grade X70 pipes are suitable for pipelines. The X70 and X80 HAZ presented softening that, according to the literature, is not a critical point for stress based design. The X80 HAZ presented CTOD below the desired value. It indicates that local brittles zones could be present and new tests should be done in order to define better welding parameters.

Keywords

Girth welding, X70, X80, Sour service.

Referências

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