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TWIP950 advanced high strength steelAdvanced high strength steel (AHSS) with a zinc-based coating for corrosionCorrosion protection is widely utilized in the automotive industry. Nevertheless, galvanized TWIP950 steels are prone to liquid metal embrittlementLiquid metal embrittlement (LME) during the resistance spot weldingResistance spot welding (RSW) process, which can possibly threaten the load-bearing capability of welded joints. In this study, the influence of welding currentsWelding current on LME of galvanized TWIP950 steel was comparatively analyzed. The crackCrack quantitative results revealed that no obvious LME cracksCrack could be observed on the welding spot surface with the current below expulsion. However, the LME cracksCrack formed with the longest length of 55.0 μm with the expulsion current of 8.0 kA. Subsequently, numerous longer LME cracksCrack were detected above expulsion, with the longest crackCrack reaching as long as 1138.9 μm. It was deemed that higher welding currentWelding current could bring much more heat input, leading to the formation of more LME cracksCrack during the RSW. Thus, it was anticipated that the LME susceptibility could be reduced in the TWIP950 welded joints with an appropriate control of the welding currentWelding current.

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Effect of the Welding Current on the Liquid Metal Embrittlement of Galvanized TWIP950 Advanced High Strength Steel

  • 会议论文

  • 发表日期：

    2025年

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  • Jingyi Gu,
  • Jiayi Zhou,
  • Yu Sun,
  • Rongxun Hu,
  • Yulai Gao

摘要

TWIP950 advanced high strength steelAdvanced high strength steel (AHSS) with a zinc-based coating for corrosionCorrosion protection is widely utilized in the automotive industry. Nevertheless, galvanized TWIP950 steels are prone to liquid metal embrittlementLiquid metal embrittlement (LME) during the resistance spot weldingResistance spot welding (RSW) process, which can possibly threaten the load-bearing capability of welded joints. In this study, the influence of welding currentsWelding current on LME of galvanized TWIP950 steel was comparatively analyzed. The crackCrack quantitative results revealed that no obvious LME cracksCrack could be observed on the welding spot surface with the current below expulsion. However, the LME cracksCrack formed with the longest length of 55.0 μm with the expulsion current of 8.0 kA. Subsequently, numerous longer LME cracksCrack were detected above expulsion, with the longest crackCrack reaching as long as 1138.9 μm. It was deemed that higher welding currentWelding current could bring much more heat input, leading to the formation of more LME cracksCrack during the RSW. Thus, it was anticipated that the LME susceptibility could be reduced in the TWIP950 welded joints with an appropriate control of the welding currentWelding current.