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Experimental investigation and numerical simulation of resistance spot welding for residual stress evaluation of DP1000 steel

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Abstract

Resistance spot welding of advanced high strength dual phase steel, with tensile strength of 980 MPa at elongation of 10 %, was experimentally investigated and numerically simulated. The FEM simulation was performed using SYSWELD in order to calculate the thermal and residual stress fields for research of effect of RSW fracture behavior. Thermo-mechanical properties of the material were modified from DP600 data to experimentally determined DP1000 from hot tensile tests made with a Gleeble system. The predefined G-electrode shape was changed to the F16-electrode used in practice. Effect of welding current on nugget size and residual stresses is examined for lower, medium, and upper currents inside welding range. Simulation nugget and heat-affected zone of the 2D model show a correlation if compared to experimental results from metallography of RSW cross sections. Residual stresses are measured using the drill hole method, but they differed from simulated stresses. Possible reasons are evaluated and discussed.

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Acknowledgments

The authors would like to thank the financial support of k-net JOIN, network of excellence for joining under the Federal Ministry of Economy and Labor, Austria. Also thank you to voestalpine Stahl GmbH, Linz, for providing material, and assistance for the welding experiments and metallographic investigations.

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Authors and Affiliations

  1. Institute for Material Science and Welding, Technical University of Graz, Kopernikusgasse 24/l, 8010, Graz, Austria

    Jukka Pakkanen, Rudolf Vallant & Mustafa Kičin

  2. Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italia

    Jukka Pakkanen

Authors
  1. Jukka Pakkanen
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  2. Rudolf Vallant
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  3. Mustafa Kičin
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Correspondence to Jukka Pakkanen.

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

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Pakkanen, J., Vallant, R. & Kičin, M. Experimental investigation and numerical simulation of resistance spot welding for residual stress evaluation of DP1000 steel. Weld World 60, 393–402 (2016). https://doi.org/10.1007/s40194-016-0301-4

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  • DOI: https://doi.org/10.1007/s40194-016-0301-4

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