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Influence of in situ postweld heat treatment on microstructure and failure behavior of dual-phase steel resistance spot weld

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Abstract

The present study aims to investigate the effect of in situ postweld heat treatment (PWHT) on microstructure, tensile shear properties, failure mode, and hardness distribution of resistance spot weld of dual-phase (DP590) steel. Tensile shear properties were evaluated in terms of peak load and failure energy. Results showed that welds subjected to high heat input in situ PWHT via double-pulse RSW process exhibit higher peak load and failure energy compared with conventional single-pulse weld. The improvement in mechanical performance is attributed to increased weld nugget size and the transition of failure mode from interfacial fracture mode to pullout fracture mode. Moreover, it was also found that increasing the tensile shear test velocity from 1.6 × 10−4 ms−1 (quasi-static) to 8.3 × 10−3 ms−1 for low-dynamic increased the peak load and failure energy of the weld.

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Acknowledgements

The authors would like to thank Bloxwich Sdn Bhd Malaysia for providing resistance spot welding facility. The authors are thankful to Peoples Steel Mill Karachi Pakistan for providing scanning electron microscope facility.

Data availability statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar, 32610, Perak Darul Ridzuan, Malaysia

    Imtiaz Ali Soomro, Srinivasa Rao Pedapati & Mokhtar Awang

  2. Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, Jamshoro 76062, Sindh, Pakistan

    Imtiaz Ali Soomro

Authors
  1. Imtiaz Ali Soomro
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  2. Srinivasa Rao Pedapati
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  3. Mokhtar Awang
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Correspondence to Imtiaz Ali Soomro.

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Soomro, I.A., Pedapati, S.R. & Awang, M. Influence of in situ postweld heat treatment on microstructure and failure behavior of dual-phase steel resistance spot weld. Int J Adv Manuf Technol 114, 3739–3750 (2021). https://doi.org/10.1007/s00170-021-07134-y

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