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Physical and Theoretical Modeling of the Nitrogen Content of Duplex Stainless Steel Weld Metal: Shielding Gas Composition and Heat Input Effects

Department of Materials Science and Engineering, Budapest University of Technology and Economics, H-1111 Budapest, Hungary
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Metals 2019, 9(7), 762; https://doi.org/10.3390/met9070762
Received: 13 June 2019 / Revised: 3 July 2019 / Accepted: 4 July 2019 / Published: 7 July 2019
(This article belongs to the Special Issue Joining of Advanced High Strength Steels for the Automotive Industry)
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Abstract

Duplex stainless steels (DSSs) are gaining more and more attention in corrosion-resistant applications and also in the transport and automotive industry. The outstanding mechanical and corrosion properties of DSSs highly depends on the austenite-to-ferrite phase balance (A/F). This phase ratio can shift in a large scale during welding. Thus, the heat input and the shielding gas composition should be optimized. Nitrogen addition to argon shielding is frequently used in DSS welding, because it is a potent austenite former. The dissolved nitrogen content in the heat-affected zone and the weld metal (WM) predetermines the A/F. To determine the effect of heat input and nitrogen content in shielding gas, two different heat inputs and six different gas compositions were used in autogenous tungsten inert gas welding. An improved theoretical model was established in order to simulate the WM dissolved nitrogen content, which calculates it with less error than the initial models. The correlation between nitrogen content and arc voltage was also determined. This improved model delivers the basics for shielding gas selection and the subsequent weld design for optimal A/F for industrial applications. View Full-Text
Keywords: duplex stainless steel (DSS); welding; shielding gas nitrogen content; weld metal nitrogen content duplex stainless steel (DSS); welding; shielding gas nitrogen content; weld metal nitrogen content
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Varbai, B.; Májlinger, K. Physical and Theoretical Modeling of the Nitrogen Content of Duplex Stainless Steel Weld Metal: Shielding Gas Composition and Heat Input Effects. Metals 2019, 9, 762.

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