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<p>This study investigates the weldability of high-strength steel plates used in the water transmission system of pumped storage power stations. The phase transformation and welding performance of 1000&#xa0;MPa grade steel plates during heating and cooling were examined via thermal simulation tests, focusing on the effects of simulated heat-affected zone continuous cooling transformation (SH-CCT) diagram, preheating temperature, and welding heat input on the properties of the heat-affected zone (HAZ). The test results show that the critical transformation temperatures Ac1 and Ac3 of the steel plate are 679 and 815&#xa0;°C, respectively, and its SH-CCT diagram consists of three transformation zones: martensite, bainitic ferrite, and granular bainite. At a cooling rate of 0.5&#xa0;°C/s, the matrix is granular bainite, but the coarse-grained zone exhibits significant softening, necessitating heat input control. As the preheating temperature increases, the hardness of the coarse-grained zone gradually decreases, and preheating to a minimum temperature of 90-120&#xa0;°C is necessary to prevent cold cracks. Considering welding efficiency and joint performance, the optimal heat input for a single thermal cycle is 20-25&#xa0;kJ/cm. Under this condition, the four sub-zones of the coarse-grained HAZ (CGHAZ) after the second thermal cycle meet service requirements. This study provides reliable theoretical and technical support for developing welding processes for 1000&#xa0;MPa grade steel plates in the water transmission systems of pumped storage power station.</p>

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Research on the Weldability of High-Strength Steel Plate in the Water Transmission System of Pumped Storage Power Stations

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Qiang Zhao,
  • Tianyu Zhang,
  • Kangli Li,
  • Huifang Sun,
  • Yuan Li,
  • Keyuan Wang,
  • Kenan Du,
  • Qingyuan Song

摘要

This study investigates the weldability of high-strength steel plates used in the water transmission system of pumped storage power stations. The phase transformation and welding performance of 1000 MPa grade steel plates during heating and cooling were examined via thermal simulation tests, focusing on the effects of simulated heat-affected zone continuous cooling transformation (SH-CCT) diagram, preheating temperature, and welding heat input on the properties of the heat-affected zone (HAZ). The test results show that the critical transformation temperatures Ac1 and Ac3 of the steel plate are 679 and 815 °C, respectively, and its SH-CCT diagram consists of three transformation zones: martensite, bainitic ferrite, and granular bainite. At a cooling rate of 0.5 °C/s, the matrix is granular bainite, but the coarse-grained zone exhibits significant softening, necessitating heat input control. As the preheating temperature increases, the hardness of the coarse-grained zone gradually decreases, and preheating to a minimum temperature of 90-120 °C is necessary to prevent cold cracks. Considering welding efficiency and joint performance, the optimal heat input for a single thermal cycle is 20-25 kJ/cm. Under this condition, the four sub-zones of the coarse-grained HAZ (CGHAZ) after the second thermal cycle meet service requirements. This study provides reliable theoretical and technical support for developing welding processes for 1000 MPa grade steel plates in the water transmission systems of pumped storage power station.