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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

  • W. Haupt
  • K. C. RiffelEmail author
  • C. L. Israel
  • R. H. G. Silva
  • A. Reguly
Technical Paper

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.

Keywords

High-power GMAW High-strength low-alloy steel HSLA DOMEX 700 Pulsed MIG/MAG 

Notes

Acknowledgements

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

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  1. 1.Welding and Metallurgy Laboratory, Department of Mechanical EngineeringUniversity of Passo FundoPasso FundoBrazil
  2. 2.Mechanical Engineering Department, LABSOLDA-Welding and Mechatronics InstituteFederal University of Santa CatarinaFlorianópolisBrazil
  3. 3.Department of Metallurgical EngineeringFederal University of Rio Grande do SulPorto AlegreBrazil

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