Scholarlink

<p>This study investigates resistance spot welding (RSW) of three dissimilar advanced high-strength steel (AHSS) joints: DH1200-DP1000, DH1000-DP1000, and DP800-DP1000, which are of significant interest to the automotive industry. By exploring underexamined aspects of dissimilar AHSS welding, several novel insights are identified. The DH1200 joint, with its high carbon equivalent and greater martensite fraction, reaches expulsion earlier than the other joints. A near-linear relationship is detected between the ferrite/martensite ratio, the lapped sheet’s ultimate tensile strength, and Alpha-to-Beta Resistance Rate (ABRR), linking microstructural features, macroscopic mechanical properties, and electrical dynamic resistance evolution. This interdependency is further reinforced by correlating ABRR and electrode indentation. At expulsion, ferrite content strongly influences two defined expulsion parameters, Beta-to-Expulsion Time Period (BETP) and Beta-to-Expulsion Resistance Rate (BERR), where higher ferrite fractions lead to shorter BETP and more negative BERR, accelerating expulsion. Additionally, as BETP increases and BERR becomes less negative, LME susceptibility rises, yielding the highest Crack Index (CI) in DH1200 at expulsion, while it exhibited no cracks at the maximum current. Finally, corona bond length (CBL) is found to inversely correlate with the maximum current, and it also decreases at expulsion, suggesting the retarding effect of a well-formed corona bond on expulsion. These findings provide a deeper understanding of dissimilar RSW, offering new insights for future AHSS design and for improving weld quality in automotive applications.</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

Resistance spot welding of dissimilar DH1200-DP1000, DH1000-DP1000, and DP800-DP1000 joints: correlating microstructure, mechanical behavior, and dynamic electrical resistance

  • 期刊论文

  • 发表日期：

    2025年11月24日

查看全文
  • Saeed Shiri,
  • Holger Schubert,
  • Benjamin Hilpert,
  • Luke N. Brewer

摘要

This study investigates resistance spot welding (RSW) of three dissimilar advanced high-strength steel (AHSS) joints: DH1200-DP1000, DH1000-DP1000, and DP800-DP1000, which are of significant interest to the automotive industry. By exploring underexamined aspects of dissimilar AHSS welding, several novel insights are identified. The DH1200 joint, with its high carbon equivalent and greater martensite fraction, reaches expulsion earlier than the other joints. A near-linear relationship is detected between the ferrite/martensite ratio, the lapped sheet’s ultimate tensile strength, and Alpha-to-Beta Resistance Rate (ABRR), linking microstructural features, macroscopic mechanical properties, and electrical dynamic resistance evolution. This interdependency is further reinforced by correlating ABRR and electrode indentation. At expulsion, ferrite content strongly influences two defined expulsion parameters, Beta-to-Expulsion Time Period (BETP) and Beta-to-Expulsion Resistance Rate (BERR), where higher ferrite fractions lead to shorter BETP and more negative BERR, accelerating expulsion. Additionally, as BETP increases and BERR becomes less negative, LME susceptibility rises, yielding the highest Crack Index (CI) in DH1200 at expulsion, while it exhibited no cracks at the maximum current. Finally, corona bond length (CBL) is found to inversely correlate with the maximum current, and it also decreases at expulsion, suggesting the retarding effect of a well-formed corona bond on expulsion. These findings provide a deeper understanding of dissimilar RSW, offering new insights for future AHSS design and for improving weld quality in automotive applications.