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<p>Although transformation-induced plasticity (TRIP) steels including Q&amp;P steel are susceptible to liquid metal embrittlement (LME) cracking, research on its thickness remains lacking. This study investigated the stress sensitivity of nuggets as a function of their thickness during resistance spot welding of Galva-annealed Q&amp;P 980 MPa steel. We selected the materials combination considering application possibilities. Under the same welding current and time conditions, the 1.4 mm combination produced more and larger LME cracks than the 1.2 mm combination. Simulations were conducted to analyze the reasons for the difference in LME crack sensitivities between thickness combinations; the results indicated that the relatively low cooling rate and approximately 10 % higher maximum stress in the 1.4 mm combination increased the LME crack rate and size. To suppress LME cracking, optimizing welding conditions, such as increasing the holding time, to allow sufficient solidification of the molten zinc (Zn), is necessary.</p>

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Effect of sheet thickness on liquid metal embrittlement cracking of Galva-annealed quench & partitioning (Q&P) 980 MPa steel during resistance spot welding

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Hyuck Min Kwon,
  • Gyu Hwan Oh,
  • Chang-Wook Lee,
  • Junyeong Jeong

摘要

Although transformation-induced plasticity (TRIP) steels including Q&P steel are susceptible to liquid metal embrittlement (LME) cracking, research on its thickness remains lacking. This study investigated the stress sensitivity of nuggets as a function of their thickness during resistance spot welding of Galva-annealed Q&P 980 MPa steel. We selected the materials combination considering application possibilities. Under the same welding current and time conditions, the 1.4 mm combination produced more and larger LME cracks than the 1.2 mm combination. Simulations were conducted to analyze the reasons for the difference in LME crack sensitivities between thickness combinations; the results indicated that the relatively low cooling rate and approximately 10 % higher maximum stress in the 1.4 mm combination increased the LME crack rate and size. To suppress LME cracking, optimizing welding conditions, such as increasing the holding time, to allow sufficient solidification of the molten zinc (Zn), is necessary.