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<p>High heat input electro-gas welding has been performed on EH36 shipbuilding steel by employing flux-cored wires containing CaF<sub>2</sub>–SiO<sub>2</sub>–MnO fluxes. It is found that most of the O in the weld metal stems from the pyrolysis of CO<sub>2</sub> rather than the decomposition of MnO and SiO<sub>2</sub> in the fluxes under the impact of high-temperature arc, while the O gain in the weld metal is well maintained in the range from 0.055 to 0.064&#xa0;wt pct. It is further demonstrated that increasing the MnO content in the fluxes can largely prevent any substantial Mn loss (from −0.722 to −0.249&#xa0;wt pct) yet effectively curb Si pick up (0.085 to 0.058&#xa0;wt pct) in the weld metal. The findings could provide both practical and theoretical guidance towards flux-cored wire design suitable for high heat input electro-gas welding.</p>

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Deciphering Element Transfer Mechanisms for Electro-Gas Welded Metals Under Flux-Gas Synergistic Protection: A Case Study into CaF2–SiO2–MnO Fluxes and CO2 Shielding Gas

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Xu Xie,
  • Shuai Han,
  • Ming Zhong,
  • Yibo Wan,
  • Yongwu Wu,
  • Imants Kaldre,
  • Cong Wang

摘要

High heat input electro-gas welding has been performed on EH36 shipbuilding steel by employing flux-cored wires containing CaF2–SiO2–MnO fluxes. It is found that most of the O in the weld metal stems from the pyrolysis of CO2 rather than the decomposition of MnO and SiO2 in the fluxes under the impact of high-temperature arc, while the O gain in the weld metal is well maintained in the range from 0.055 to 0.064 wt pct. It is further demonstrated that increasing the MnO content in the fluxes can largely prevent any substantial Mn loss (from −0.722 to −0.249 wt pct) yet effectively curb Si pick up (0.085 to 0.058 wt pct) in the weld metal. The findings could provide both practical and theoretical guidance towards flux-cored wire design suitable for high heat input electro-gas welding.