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<p>Bimetallic composite pipes have received widespread attention because of their excellent performance and low cost. However, the residual stresses in welded joints with different groove angles of L360QS/Incoloy 825 have not been analyzed. The analysis of residual stresses in welded joints through numerical simulation is beneficial to the development and improvement of the welding process. Therefore, in this paper, the use of Simufact.Welding 6.0 and another software, a thermal coupling finite element model of the bimetallic composite pipe, was established, and the actual test results were used for comparison and verification. The results show that the 8° groove angle induces higher peak equivalent residual stress (389.3&#xa0;MPa on the outer surface) compared to the 15° angle (375.1&#xa0;MPa). The circumferential residual stress at the weld center of the 8° groove is 315.4&#xa0;MPa, which is 7.4% higher than that of the 15° groove (293.7&#xa0;MPa). This study clarifies the influence mechanism of groove angle on residual stress, providing direct technical support for the optimization of bimetallic pipe welding processes.</p>

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Effects of groove angle on heat source distribution and residual stress in L360QS/Incoloy 825 bimetallic composite pipes: numerical simulation and experimental validation

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Jiayao Liu,
  • Xing Yan,
  • Jingxiang Lu,
  • Hao Li,
  • Jia Xu,
  • Yang Li,
  • Mei Yang

摘要

Bimetallic composite pipes have received widespread attention because of their excellent performance and low cost. However, the residual stresses in welded joints with different groove angles of L360QS/Incoloy 825 have not been analyzed. The analysis of residual stresses in welded joints through numerical simulation is beneficial to the development and improvement of the welding process. Therefore, in this paper, the use of Simufact.Welding 6.0 and another software, a thermal coupling finite element model of the bimetallic composite pipe, was established, and the actual test results were used for comparison and verification. The results show that the 8° groove angle induces higher peak equivalent residual stress (389.3 MPa on the outer surface) compared to the 15° angle (375.1 MPa). The circumferential residual stress at the weld center of the 8° groove is 315.4 MPa, which is 7.4% higher than that of the 15° groove (293.7 MPa). This study clarifies the influence mechanism of groove angle on residual stress, providing direct technical support for the optimization of bimetallic pipe welding processes.