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<p>Intercritical annealed medium manganese steel was joined by a resistance spot welding process using 1.2-mm-thick sheets. The initial microstructure of the sheet was composed of ferrite and austenite mixture which was obtained after the intercritical annealing treatment. Three current values of 5, 7 and 9 kA were used during the welding. Microhardness values were the highest in the fusion zone followed by a decrease in the coarse-grain heat affected zone and then an increase in the fine-grain heat affected zone. Standard AWS D8.1M requirements were evaluated at the surface of the joints and in metallographic cross sections. The sample with highest welding current condition was the only one that completely fulfilled these requirements. However, none of the samples met the minimum load requirement specified in the AWS D8.1M.</p> Graphical abstract <p></p>

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Microstructure and mechanical properties of medium Mn steel joints developed during the application of resistance spot welding

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Leonardo Weinmann Trejo,
  • Carlos Gamaliel Garay Reyes,
  • Mitsuo Osvaldo Ramos Azpeitia,
  • Arnoldo Bedolla Jacuinde,
  • José Luis Hernández Rivera

摘要

Intercritical annealed medium manganese steel was joined by a resistance spot welding process using 1.2-mm-thick sheets. The initial microstructure of the sheet was composed of ferrite and austenite mixture which was obtained after the intercritical annealing treatment. Three current values of 5, 7 and 9 kA were used during the welding. Microhardness values were the highest in the fusion zone followed by a decrease in the coarse-grain heat affected zone and then an increase in the fine-grain heat affected zone. Standard AWS D8.1M requirements were evaluated at the surface of the joints and in metallographic cross sections. The sample with highest welding current condition was the only one that completely fulfilled these requirements. However, none of the samples met the minimum load requirement specified in the AWS D8.1M.

Graphical abstract