Scholarlink

<p>Thermal and mechanical loading, combined with zinc coating, are the primary factors influencing liquid metal embrittlement (LME) in the investigated advanced high-strength dual-phase steel, with a yield strength of 1200&#xa0;MPa and high ductility during resistance spot welding. LME results in a ductility loss of up to 95% and is driven by an intergranular decohesion mechanism, leading to brittle failure in otherwise ductile steel. Validated numerical models provide deeper insights into the critical conditions during welding. The presented multi-physical model enables the optimisation of welding parameters, reducing experimental efforts and enhancing manufacturing efficiency. This study introduces new methods to reduce LME while improving overall weld quality. Surface-coated refractory electrodes significantly reduce embrittlement compared to standard copper electrodes. For copper electrodes, a newly developed shape minimises stresses and misalignment-induced stresses, further reducing embrittlement and enhancing weldability. Additionally, a mandatory holding time after welding effectively lowers embrittlement, while interrupted cooling creates critical conditions. Downward ramped current improves surface conditions, rendering the weld spot less susceptible to embrittlement.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Electrode and process design for regulation of liquid metal embrittlement phenomenon during spot welding of dual-phase steel: numerical modelling and experiments

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月15日

查看全文
  • Konstantin Manuel Prabitz,
  • Thomas Antretter,
  • Holger Schubert,
  • Benjamin Hilpert,
  • Martin Gruber,
  • Robert Sierlinger,
  • Michael Mark,
  • Sebastian Seibold,
  • Peter Raninger,
  • Werner Ecker

摘要

Thermal and mechanical loading, combined with zinc coating, are the primary factors influencing liquid metal embrittlement (LME) in the investigated advanced high-strength dual-phase steel, with a yield strength of 1200 MPa and high ductility during resistance spot welding. LME results in a ductility loss of up to 95% and is driven by an intergranular decohesion mechanism, leading to brittle failure in otherwise ductile steel. Validated numerical models provide deeper insights into the critical conditions during welding. The presented multi-physical model enables the optimisation of welding parameters, reducing experimental efforts and enhancing manufacturing efficiency. This study introduces new methods to reduce LME while improving overall weld quality. Surface-coated refractory electrodes significantly reduce embrittlement compared to standard copper electrodes. For copper electrodes, a newly developed shape minimises stresses and misalignment-induced stresses, further reducing embrittlement and enhancing weldability. Additionally, a mandatory holding time after welding effectively lowers embrittlement, while interrupted cooling creates critical conditions. Downward ramped current improves surface conditions, rendering the weld spot less susceptible to embrittlement.