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Effect of profile force on toughness of resistance spot weld joints for ultra high strength steel

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Abstract

Transformation-induced plasticity (TRIP) steel is a kind of ultra high strength steel (UHSS) that has been widely used in vehicle body manufacturing due to its excellent mechanical properties. However, high carbon content of TRIP steel will cause the brittle fracture. Additional post-heat schedule is an effective way to improve toughness of spot weld joint. But the long extraneous weld cycles will be a tragedy in view of productivity. This study proposes an alternative strategy to improve toughness by using profile force. Profile force was successfully applied by making use of a stand-alone servo electrode force controller, and TRIP 1180 steel sheet samples were welded with constant force and profile force. The experimental results indicated that toughness of spot weld joints is remarkably increased in the case of profile force.

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Acknowledgements

This research was supported by POSCO Grant 2015X036. The authors would like to express special thanks.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Myongji University, Yong-Inn city, 449-728, Republic of Korea

    Han Jun Lin, Wook Jin Kim & Hee Seok Chang

  2. POSCO Global R&D Center, Songdo-dong, Incheon, 406-840, Republic of Korea

    Du Youl Choi

Authors
  1. Han Jun Lin
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  2. Wook Jin Kim
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  3. Hee Seok Chang
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  4. Du Youl Choi
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Correspondence to Hee Seok Chang.

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Recommended for publication by Commission III - Resistance Welding, Solid State Welding, and Allied Joining Process

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Lin, H.J., Kim, W.J., Chang, H.S. et al. Effect of profile force on toughness of resistance spot weld joints for ultra high strength steel. Weld World 62, 481–496 (2018). https://doi.org/10.1007/s40194-018-0571-0

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  • DOI: https://doi.org/10.1007/s40194-018-0571-0

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