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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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.
KeywordsHigh-power GMAW High-strength low-alloy steel HSLA DOMEX 700 Pulsed MIG/MAG
The authors would like to acknowledge the financial support of CAPES and CNPq.
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