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Nucleus geometry and mechanical properties of resistance spot welded coated–uncoated DP automotive steels

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Abstract

In this study, mechanical properties of resistance spot welding of DP450 and DP600, galvanized and ungalvanized automotive sheets have been investigated. The specimens have been joined by resistance spot welding at different weld currents and times. Welded specimens have been examined for their mechanical, macrostructure and microstructure properties. Depending on the weld current and time, effects of zinc coating on tensile properties, microhardness values as well as microstructure nugget geometry and nucleus size ratio have been investigated. X-ray diffraction analysis has been used to investigate the phase that formed at the joint interface. Result of the experiment show that nugget diameter, indentation depth and tensile load-bearing capacity are affected by weld parameters. Coating prevents full joining at low parameters. Microhardness increased in heat-affected zone and weld metal.

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Acknowledgement

The authors thank Mr Özcan on behalf of TOFAS AS in Turkey for the kind material support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Engineering Faculty, Mersin University, 33343, Ciftlikkoy, Mersin, Turkey

    IBRAHIM SEVIM

  2. Metallurgy Materials Engineering Department, Engineering Faculty, Karabuk University Baliklarkayasi, Karabuk, Turkey

    FATIH HAYAT

  3. Faculty of Tarsus Technical Education, Mersin University, 33480, Tarsus, Turkey

    MUSTAFA KEMAL KULEKCI

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  1. IBRAHIM SEVIM
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  2. FATIH HAYAT
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  3. MUSTAFA KEMAL KULEKCI
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Correspondence to IBRAHIM SEVIM.

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SEVIM, I., HAYAT, F. & KULEKCI, M.K. Nucleus geometry and mechanical properties of resistance spot welded coated–uncoated DP automotive steels. Bull Mater Sci 36, 1049–1055 (2013). https://doi.org/10.1007/s12034-013-0559-8

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  • DOI: https://doi.org/10.1007/s12034-013-0559-8

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