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Influence of length / diameter ratio and post weld heat treatment on collapse resistance of welded pipes

Carvalho, G.H.S.F.L. ; Cordeiro, W.R. ; Payão Filho, J.C.

The International journal of pressure vessels and piping, 2019-03, Vol.171, p.224-232 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Influence of length / diameter ratio and post weld heat treatment on collapse resistance of welded pipes
  • Autor: Carvalho, G.H.S.F.L. ; Cordeiro, W.R. ; Payão Filho, J.C.
  • Assuntos: Collapse resistance under external pressure ; Etchant for seam steel pipe ; High collapse pipe ; High-frequency induction welding ; Microstructure ; Oil and gas
  • É parte de: The International journal of pressure vessels and piping, 2019-03, Vol.171, p.224-232
  • Descrição: Three steel pipes longitudinally welded by a high-frequency induction process are developed. A post weld heat treatment is performed, and its effect on the microstructure, mechanical properties, and collapse resistance is analysed. The influence of the length/diameter ratios on the collapse resistance, and a method to improve the metallographic analysis of the weld lines are studied. The post weld heat treatment resulted in a homogeneous microstructure and uniform mechanical properties, and the etchant for the weld line analysis revealed the flowlines and the localised decarburisation with excellent contrast. An increase in the length/diameter ratio leads to a decrease in the collapse resistance; however, the tensile strength proved to be a significant influence on this phenomenon. Collapse resistance is a characteristic of the component itself in which several aspects such as manufacturing, mechanical properties, and dimensions shall be considered, and it is not an intrinsic property of the alloy. •An increase in the length/diameter ratio led to a decrease in the collapse resistance.•The collapse resistance was more sensitive to changes in strength.•The heat treatment resulted in a homogeneous microstructure throughout the pipe.•Collapse resistance is not a feature exclusively related to the alloys' properties.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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