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<p>In this study, butt welding of X80/2205 bimetallic lined pipe was performed using two different materials: ENiCrFe-3 and ENiCrMo-3. Both mechanical and corrosion-resistance properties of welded joints were evaluated. The results show that, compared with ENiCrFe-3 joint, ENiCrMo-3 joint possessed higher tensile strength and hardness, yet lower Charpy energy. A crack appeared in bending specimens of ENiCrFe-3 joint due to the higher hardness of surfacing layer compared to the root weld, and the presence of stress concentration caused by misalignment defects at the junction between the root weld and the surfacing layer. There were more corrosion pits in the ENiCrFe-3 weld than ENiCrMo-3 weld which is explained by the fact that the coincident site lattice (CSL) boundary of ENiCrMo-3 weld is obviously more than ENiCrFe-3 weld. The ENiCrMo-3 can improve the corrosion resistance of the weld compared to ENiCrFe-3. It is advisable to use ENiCrMo-3 to weld X80/2205 bimetal composite pipe to avoid welded joint failure.</p>

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Effect of Welding Materials on Microstructure, Mechanical and Corrosion-Resistance Properties of Welded Joints of Bimetal Composite Pipe

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Xianqiao Fu,
  • Bin Han,
  • Zhenhua Gao,
  • Fuwang Song,
  • Liying Li,
  • Xueda Li

摘要

In this study, butt welding of X80/2205 bimetallic lined pipe was performed using two different materials: ENiCrFe-3 and ENiCrMo-3. Both mechanical and corrosion-resistance properties of welded joints were evaluated. The results show that, compared with ENiCrFe-3 joint, ENiCrMo-3 joint possessed higher tensile strength and hardness, yet lower Charpy energy. A crack appeared in bending specimens of ENiCrFe-3 joint due to the higher hardness of surfacing layer compared to the root weld, and the presence of stress concentration caused by misalignment defects at the junction between the root weld and the surfacing layer. There were more corrosion pits in the ENiCrFe-3 weld than ENiCrMo-3 weld which is explained by the fact that the coincident site lattice (CSL) boundary of ENiCrMo-3 weld is obviously more than ENiCrFe-3 weld. The ENiCrMo-3 can improve the corrosion resistance of the weld compared to ENiCrFe-3. It is advisable to use ENiCrMo-3 to weld X80/2205 bimetal composite pipe to avoid welded joint failure.