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Microstructure and Tensile-Shear Properties of Resistance Spot Welded 22MnMoB Hot-Stamping Annealed Steel

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Abstract

The present paper deals with the joining of 22MnMoB hot-stamping annealed steel carried out by the spot welding process. Microstructural characterization, microhardness testing and tensile-shear testing were conducted. The effects of the welding parameters, including the electrode tip diameter, welding current, welding time and electrode force upon the tensile-shear properties of the welded joints, were investigated. The results showed that a weld size of 9.6 mm was required to ensure pullout failure for the 1.8-mm-thick hot-stamping annealed steel sheet. The welding current had the largest influence upon the tensile-shear properties of the 22MnMoB steel welded joint. The bulk resistance should play an important role in the nugget formation. In pullout failure mode, failure was initiated at the heat-affected zone, where softening occurs owing to the tempering of martensite.

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Acknowledgments

This work is supported by Natural Science Foundation of China (Grants 51275342 and 51275338).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, No. 92 Weijin Road, Tianjin, 300072, China

    Yang Li, Xuetuan Cui, Zhen Luo & Sansan Ao

  2. Collaborative Innovation Center of Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China

    Zhen Luo

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  1. Yang Li
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  2. Xuetuan Cui
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Correspondence to Zhen Luo.

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Li, Y., Cui, X., Luo, Z. et al. Microstructure and Tensile-Shear Properties of Resistance Spot Welded 22MnMoB Hot-Stamping Annealed Steel. J. of Materi Eng and Perform 26, 424–430 (2017). https://doi.org/10.1007/s11665-016-2448-y

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  • DOI: https://doi.org/10.1007/s11665-016-2448-y

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