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The Effect of Arc Current on Microstructure and Mechanical Properties of Hybrid LasTIG Welds of High-Strength Low-Alloy Steels

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Abstract

A hybrid laser-tungsten inert gas (LasTIG) welding system was applied for 3-mm-thick S460MC and S700MC high-strength low-alloy steel sheet butt welding with the aim to reduce the cooling rate compared with laser welding. The effect of the electric current was evaluated. Increasing arc current led to the increase of fused metal and heat-affected-zone (HAZ) dimensions. Fused metal grains were larger whereas the microhardness increase toward the base metal was lower at higher currents in this region. Microhardness peaks corresponding to the coarse-grained HAZ were reduced at higher currents for S460MC but were almost not affected in S700MC. The tensile strength of both the laser weld and LasTIG welds was comparable to the base metal for both alloys.

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Acknowledgments

This research was supported by the Technology Agency of the Czech Republic (Project GAMA TG03010046) and the Ministry of Education, Youth and Sports of the Czech Republic (Project LO1212). The research infrastructure was funded by the Ministry of Education, Youth and Sports of the Czech Republic and the European Commission (Project CZ.1.05/2.1.00/01.0017) and by the Czech Academy of Sciences (Project RVO:68081731). The authors would like to thank Ing. Kamil Podaný, PhD, for the tensile test execution.

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Authors and Affiliations

  1. Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 612 64, Brno, Czech Republic

    Hana Šebestová, Petr Horník, Libor Mrňa & Eliška Mikmeková

  2. Faculty of Mechanical Engineering, Institute of Materials Science and Engineering, Brno University of Technology, Technická 2896/2, 616 69, Brno, Czech Republic

    Pavel Doležal

Authors
  1. Hana Šebestová
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  2. Petr Horník
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  3. Libor Mrňa
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Correspondence to Hana Šebestová.

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Manuscript submitted April 17, 2018.

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Šebestová, H., Horník, P., Mrňa, L. et al. The Effect of Arc Current on Microstructure and Mechanical Properties of Hybrid LasTIG Welds of High-Strength Low-Alloy Steels. Metall Mater Trans B 49, 3559–3569 (2018). https://doi.org/10.1007/s11663-018-1385-6

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