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A Phenomenological Study of Weld Discontinuities and Defects in Resistance Spot Welding of Advanced High Strength TRIP Steel

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Abstract

To obtain reliable resistance spot welds that guarantees their satisfactory mechanical performance and improved crashworthiness in the vehicle autobody, it is vital to study the causes, conditions, and welding parameters resulting in the formation of defects and discontinuities in the welds. This work studies the weld discontinuities and defects that are likely to occur in resistance spot welding of 1-GPa transformation-induced plasticity steel. The causes of the formation of weld discontinuities and defects are discussed here. It is found that the rich chemistry and complex thermomechanical processing and thus special thermophysical properties of the alloy have significant impacts on the susceptibility of the welds to defects. The amount of heat input induced by the welding process also plays an important role on the defect formation. From the ductility ratio results, it can be said that there are critical heat input and critical nugget size for occurrence of the weld discontinuities and defects. The susceptibility of the resistance spot welds of the experimental alloy to early expulsion, liquation cracking, surface breaking cracks and their consequences on weld quality and performance are discussed here.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The first author wishes to thank the Dezful Branch, Islamic Azad University, for its support. The authors would also like to thank all editors, key reader and reviewers for their valuable comments in the development and improvement of this paper.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Dezful Branch, Islamic Azad University, P.O. Box 313, Dezful, Iran

    Rouholah Ashiri

  2. Department of Materials and Metallurgical Engineering, Faculty of Engineering, Arak University, Arak, Iran

    Hossein Mostaan

  3. Department of Advanced Materials and Industrial Management Engineering, Dong-Eui University, Busan, Republic of Korea

    Yeong-Do Park

Authors
  1. Rouholah Ashiri
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  2. Hossein Mostaan
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  3. Yeong-Do Park
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Corresponding author

Correspondence to Rouholah Ashiri.

Additional information

Manuscript submitted April 1, 2018.

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Ashiri, R., Mostaan, H. & Park, YD. A Phenomenological Study of Weld Discontinuities and Defects in Resistance Spot Welding of Advanced High Strength TRIP Steel. Metall Mater Trans A 49, 6161–6172 (2018). https://doi.org/10.1007/s11661-018-4900-0

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  • DOI: https://doi.org/10.1007/s11661-018-4900-0

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