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Article

Influence of Metallic Oxide Nanoparticles on the Mechanical Properties of an A-TIG Welded 304L Austenitic Stainless Steel

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Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia
2
Faculty of Special Technology, Alexander Dubček University of Trenčín, Študentská 2, 911 50 Trenčín, Slovakia
3
Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
4
Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva c. 6, 1000 Ljubljana, Slovenia
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(20), 4513; https://doi.org/10.3390/ma13204513
Received: 25 August 2020 / Revised: 4 October 2020 / Accepted: 11 October 2020 / Published: 12 October 2020
(This article belongs to the Special Issue Welding and Joining of Materials for Advanced Aerospace Applications)
Austenitic stainless steels represent a significant aerospace material, being used for various castings, structural components, landing gear components, afterburners, exhaust components, engine parts, and fuel tanks. The most common joining process is tungsten inert gas (TIG) welding, which possesses many advantages such as suitability to weld a wide range of ferrous and non-ferrous metals and alloys, providing high quality welds with good mechanical properties. Its major disadvantage is low productivity due to low penetration and welding speed. This can be overcome by introducing an activating flux before welding. The activating flux reverses the material flow of the weld pool, significantly increasing penetration. Therefore, shielding gas consumption is reduced and welding without a consumable is enabled. However, the consumable in conventional TIG also enables the conditioning of the mechanical properties of welds. In this study, Si and Ti metallic oxide nanoparticles were used to increase the weld penetration depth, while bend testing, tensile, and impact toughness were determined to evaluate the mechanical properties of welds. Furthermore, optical emission spectroscopy, light, and scanning electron microscope were used to determine the chemical compositions and microstructures of the welds. Chemical compositions and weld mechanical properties were similar in all specimens. The highest tensile and impact properties were obtained with the specimen welded with the flux containing 20% TiO2 and 80% SiO2 nanoparticles. Although lower than those of the base metal, they were well within the nominal base metal mechanical properties. View Full-Text
Keywords: oxide flux; activated tungsten inert gas welding; mechanical properties; 304L stainless steel oxide flux; activated tungsten inert gas welding; mechanical properties; 304L stainless steel
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MDPI and ACS Style

Balos, S.; Dramicanin, M.; Janjatovic, P.; Kulundzic, N.; Zabunov, I.; Pilic, B.; Klobčar, D. Influence of Metallic Oxide Nanoparticles on the Mechanical Properties of an A-TIG Welded 304L Austenitic Stainless Steel. Materials 2020, 13, 4513. https://doi.org/10.3390/ma13204513

AMA Style

Balos S, Dramicanin M, Janjatovic P, Kulundzic N, Zabunov I, Pilic B, Klobčar D. Influence of Metallic Oxide Nanoparticles on the Mechanical Properties of an A-TIG Welded 304L Austenitic Stainless Steel. Materials. 2020; 13(20):4513. https://doi.org/10.3390/ma13204513

Chicago/Turabian Style

Balos, Sebastian, Miroslav Dramicanin, Petar Janjatovic, Nenad Kulundzic, Ivan Zabunov, Branka Pilic, and Damjan Klobčar. 2020. "Influence of Metallic Oxide Nanoparticles on the Mechanical Properties of an A-TIG Welded 304L Austenitic Stainless Steel" Materials 13, no. 20: 4513. https://doi.org/10.3390/ma13204513

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