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<p>The microstructure and phase composition of a pipe welded joint from alloy HP40NbTi of the Fe – 25Cr – 35Ni system formed by a pulsed gas tungsten arc welding (GTAW) process are studied using light and electron microscopy and x-ray spectrum microanalysis. The short-term and long-term mechanical properties of the joint are determined. It is shown that a more uniform temperature field with a lower temperature level during the pulsed welding prevents active development of the NbC → G phase transformation in the HP40NbTi alloy as compared to the standard GTAW process. This contributes to formation of a more homogeneous structure in the weld metal, greater uniformity of strength in different zones of the welded joint, and elevation of its operating properties.</p>

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Analysis of the Structure and Properties of Pipe Welded Joint from Heat-Resistant Alloy HP40NbTi Obtained by Pulsed GTAW

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • S. Yu. Kondrat’ev,
  • M. D. Fuks

摘要

The microstructure and phase composition of a pipe welded joint from alloy HP40NbTi of the Fe – 25Cr – 35Ni system formed by a pulsed gas tungsten arc welding (GTAW) process are studied using light and electron microscopy and x-ray spectrum microanalysis. The short-term and long-term mechanical properties of the joint are determined. It is shown that a more uniform temperature field with a lower temperature level during the pulsed welding prevents active development of the NbC → G phase transformation in the HP40NbTi alloy as compared to the standard GTAW process. This contributes to formation of a more homogeneous structure in the weld metal, greater uniformity of strength in different zones of the welded joint, and elevation of its operating properties.