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<p>Conventional TIG welding of EH36 marine steel suffers from limited penetration and coarse microstructures, which adversely affect joint performance. This study introduces fast-frequency double-pulsed TIG (FFDP-TIG) as an innovative approach to overcome these issues. The relationship between arc morphology, weld formation, phase evolution, grain characteristics, microhardness, tensile property, and electrochemical corrosion behavior was systematically investigated. Compared to conventional single-pulsed TIG (SP-TIG), FFDP-TIG enhances arc concentration and electromagnetic stirring, increasing weld penetration by 11.8% while reducing weld and heat-affected zone widths by 10.2% and 5.3%, respectively. These effects refine and homogenize the solidification structure, reduce grain size by 21.6%, and increase the proportion of Σ3 grain boundaries. The refined microstructure improves corrosion resistance, with a 24.9% reduction in self-corrosion current density, and maintains superior mechanical properties. However, the study requires further validation under industrial conditions. Overall, FFDP-TIG offers a promising balance between strength and corrosion resistance for marine steel welding.</p> Graphical abstract <p></p>

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Microstructure, mechanical properties, and corrosion resistance of EH36 steel welds fabricated by fast-frequency double-pulsed TIG welding

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Danhuan Zhou,
  • Haipeng Liao,
  • Baojun Zuo,
  • Jianliang Hu,
  • Zhelong Song,
  • Qin Zhang,
  • Yi Feng,
  • Zhenmin Wang

摘要

Conventional TIG welding of EH36 marine steel suffers from limited penetration and coarse microstructures, which adversely affect joint performance. This study introduces fast-frequency double-pulsed TIG (FFDP-TIG) as an innovative approach to overcome these issues. The relationship between arc morphology, weld formation, phase evolution, grain characteristics, microhardness, tensile property, and electrochemical corrosion behavior was systematically investigated. Compared to conventional single-pulsed TIG (SP-TIG), FFDP-TIG enhances arc concentration and electromagnetic stirring, increasing weld penetration by 11.8% while reducing weld and heat-affected zone widths by 10.2% and 5.3%, respectively. These effects refine and homogenize the solidification structure, reduce grain size by 21.6%, and increase the proportion of Σ3 grain boundaries. The refined microstructure improves corrosion resistance, with a 24.9% reduction in self-corrosion current density, and maintains superior mechanical properties. However, the study requires further validation under industrial conditions. Overall, FFDP-TIG offers a promising balance between strength and corrosion resistance for marine steel welding.

Graphical abstract