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Effect of wire electrode and shielding gas compositions on the mechanical properties of DOMEX 700 steel welded by the GMAW-P process

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Abstract

High-strength steels such as DOMEX 700 combine high mechanical strength and great ductility. However, when processed by welding their microstructure could present grain growth and deleterious phase formation. Nevertheless, using high-power GMAW-P the effects of electrode and shielding gas composition on the mechanical and microstructure properties of DOMEX 700 welded joints need to be understood. Thus, wire electrodes such as AWS ER 90S-D2 (A1) and AWS ER 120S-G (A2), and shielding gases such as Ar + 15% CO2 (G1) and Ar + 8% CO2 (G2) were used and the microstructure of welded joints was analyzed through optical and scanning electron microscope (SEM). Mechanical properties of joints was characterized through joint tensile test, impact test from 20 to − 40 °C, and microhardness in the joint cross-sectional. It is possible to highlight the increase in strength and elongation values with the use of electrode A2, and reduction in impact energy values for specimens welded by gas mixture G2.

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Acknowledgements

The authors would like to acknowledge the financial support of CAPES and CNPq.

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Authors and Affiliations

  1. Welding and Metallurgy Laboratory, Department of Mechanical Engineering, University of Passo Fundo, Passo Fundo, 90001-970, Brazil

    W. Haupt & C. L. Israel

  2. Mechanical Engineering Department, LABSOLDA-Welding and Mechatronics Institute, Federal University of Santa Catarina, Florianópolis, 88040-900, Brazil

    K. C. Riffel & R. H. G. Silva

  3. Department of Metallurgical Engineering, Federal University of Rio Grande do Sul, Porto Alegre, 90040-060, Brazil

    A. Reguly

Authors
  1. W. Haupt
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  2. K. C. Riffel
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  3. C. L. Israel
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  4. R. H. G. Silva
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Correspondence to K. C. Riffel.

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Technical Editor: Márcio Bacci da Silva.

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Haupt, W., Riffel, K.C., Israel, C.L. et al. Effect of wire electrode and shielding gas compositions on the mechanical properties of DOMEX 700 steel welded by the GMAW-P process. J Braz. Soc. Mech. Sci. Eng. 40, 174 (2018). https://doi.org/10.1007/s40430-018-1117-5

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  • DOI: https://doi.org/10.1007/s40430-018-1117-5

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