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<p>A method for situating the thermal and mechanical processes in arc welding of steel with allowance for phase transformations is suggested. The method is based on calculating the properties of the steel, which depend on the temperature, on the actual fractions of phases of the microstructure and on the influence functions of every main phase. Using an example of underwater wet welding of shipbuilding steel, it is shown that low-temperature decomposition of austenite leads to a sharp decrease in residual stresses in the weld. The residual longitudinal stresses in the heat-affected zone reach the yield point. The coincidence of the calculated and experimental distributions of the temperature and of the residual stresses is satisfactory.</p>

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Effect of Phase Transformations on Thermal and Mechanical Processes in Welding of Low-Alloy Steel

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • M. K. Tishkov,
  • Y. Aldaiee,
  • V. E. Nikulin,
  • V. A. Karkhin,
  • S. G. Parshin,
  • A. M. Levchenko

摘要

A method for situating the thermal and mechanical processes in arc welding of steel with allowance for phase transformations is suggested. The method is based on calculating the properties of the steel, which depend on the temperature, on the actual fractions of phases of the microstructure and on the influence functions of every main phase. Using an example of underwater wet welding of shipbuilding steel, it is shown that low-temperature decomposition of austenite leads to a sharp decrease in residual stresses in the weld. The residual longitudinal stresses in the heat-affected zone reach the yield point. The coincidence of the calculated and experimental distributions of the temperature and of the residual stresses is satisfactory.