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<p>The aging process of API X65 steel welded joints significantly impacts their mechanical and microstructural properties, influencing pipeline integrity and longevity. This study investigates the effects of artificial aging on the longitudinal welds of API X65 steel, evaluating changes in mechanical behavior, microstructural evolution, and electrical conductivity. Optical Microscopy, Scanning Electron Microscopy, and Electron Backscatter Diffraction were employed to analyze microstructural transformations, including phase distribution and carbide precipitation. Charpy impact tests assessed the energy absorption capacity of the welded joints, revealing the influence of aging on toughness. Additionally, the Alternating Current Potential Drop (ACPD) technique provided insights into the material's electrical conductivity, serving as a non-destructive tool for aging assessment. Results indicate that aging promotes microstructural changes such as carbide precipitation and grain boundary alterations, leading to increased hardness and reduced toughness, particularly in the fusion zone. Statistical analysis demonstrated a strong correlation between Charpy impact energy and electrical conductivity, confirming the potential of ACPD as a reliable monitoring technique for pipeline aging and degradation. These findings contribute to the development of more effective maintenance and safety strategies for welded pipeline infrastructures.</p>

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Non-Destructive Monitoring of the Effect of Artificial Aging on API X65 Pipeline Welded Joints

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • V. Conejo,
  • H. Carreón,
  • A. Ruiz

摘要

The aging process of API X65 steel welded joints significantly impacts their mechanical and microstructural properties, influencing pipeline integrity and longevity. This study investigates the effects of artificial aging on the longitudinal welds of API X65 steel, evaluating changes in mechanical behavior, microstructural evolution, and electrical conductivity. Optical Microscopy, Scanning Electron Microscopy, and Electron Backscatter Diffraction were employed to analyze microstructural transformations, including phase distribution and carbide precipitation. Charpy impact tests assessed the energy absorption capacity of the welded joints, revealing the influence of aging on toughness. Additionally, the Alternating Current Potential Drop (ACPD) technique provided insights into the material's electrical conductivity, serving as a non-destructive tool for aging assessment. Results indicate that aging promotes microstructural changes such as carbide precipitation and grain boundary alterations, leading to increased hardness and reduced toughness, particularly in the fusion zone. Statistical analysis demonstrated a strong correlation between Charpy impact energy and electrical conductivity, confirming the potential of ACPD as a reliable monitoring technique for pipeline aging and degradation. These findings contribute to the development of more effective maintenance and safety strategies for welded pipeline infrastructures.