Corrosion Resistance of TIG Welded Joints of Stainless Steels

Alcantara, Amanda Silveira; Fábián, Enikő Réka; Furkó, Mónika; Fazakas, Éva; Dobránszky, János; Berecz, Tibor

doi:10.4028/www.scientific.net/msf.885.190

Cited by 11 publications

(6 citation statements)

References 3 publications

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“…From Table 5, it can be clearly seen that although the arc energies were kept constant, the increasing N 2 content in the shielding gas means increasing amount of heat during TIG welding, which is represented in the increasing values of WM geometries. This observation was taken into account during the solution of the theoretical model in Equations (2), (21), (26), and (27).…”

Section: Weld Geometry Resultsmentioning

confidence: 99%

“…Thus, the base materials' (BMs) nitrogen content plays a significant role during DSS welding. During arc welding of DSSs, the nitrogen loss from the weld metal (WM) leads toward more ferritic microstructures and to the loss of the abovementioned properties [21,22]. In order to balance this nitrogen loss, nitrogen (N 2 )-argon (Ar) (or helium) mixed shielding gases are used in industrial applications for DSS tungsten inert gas (TIG) welding [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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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

Varbai

Májlinger

2019

Metals

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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.

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Section: Weld Geometry Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Varbai

Májlinger

2019

Metals

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“…However, to obtain a weld joint with two more balanced phases and higher mechanical properties, it is not enough to only regulate the welding heat input. Alcantara et al [ 12 ] used Ar as the shielding gas to weld 2304 duplex stainless steel by TIG and found that the loss of N in the molten pool was serious. The ferrite content in both the weld metal and HAZ was relatively high compared to BM.…”

Section: Introductionmentioning

confidence: 99%

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Yang,

Zheng,

Wang

et al. 2023

Materials

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To solve the shortage of austenite phase precipitation caused by nitrogen loss in the welding process of UNS S2205 duplex stainless steel (DSS), shielding gas nitriding was investigated by adding different N2 contents in Ar shielding gas during the welding process. A good thin-walled pipe butt joint was formed using the pulsed tungsten inert gas (P-TIG) welding method with Ar-N2 shielding gas. High cycle fatigue tests of the weld joints were conducted to study the effect of shielding gas nitriding on the fatigue properties. Fatigue tests at three stress levels of 225 MPa, 270 MPa, and 360 MPa were carried out on the weld joints with different N2 contents, and the fatigue samples were all fractured in the high temperature heat-affected zone (H-HAZ). Within the current process parameters, the fatigue life of the 4 vol.% N2 welded joints was optimal. Fatigue striations appeared in the fatigue crack propagation zone, and the transient fracture zone was similar to the tensile fracture. Under the low-stress level, the area of the crack propagation zone under 4 vol.% N2 was the highest, the tear ridges all expanded around the crack source area, and the fatigue crack propagation zone presented a radial distribution. The proliferation and expansion of dislocations were mainly carried out in the austenite grains, and the dislocation density of the fatigue specimens under 4 vol.% N2 was smaller than that of the Ar specimens. Shielding gas nitriding effectively improved the balance of the two-phase ratio and the hardness of austenite phase, optimized the internal slip system, inhibited the proliferation of dislocations in the austenite phase, and improved the fatigue life of weld joints.

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“…The condition for corrosion resistance is a stable, contiguous, passive layer on the steel surface. This is met when Cr ≥ 12% and C ≤ 1.2% [3][4][5][6]. This resistance is provided by the chromium-oxide ( Cr 2 O 3 ) [7] on the surface of the steel if the amount of Cr is higher on the surface than inside of the material.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Welding Parameters on the Corrosion Resistance of Austenitic Stainless Steel

Kemény

Kovács²

2022

Period. Polytech. Mech. Eng.

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Electricity produced in power plants is essential in our everyday life. In general, the energy transfer takes place after processing the energy source in boilers or steam generators. Steam is generated through this process, that operates the turbines and they generate electricity through the generators. As such equipment operates in a high pressure, corrosive and high temperature environment, these circumstances may damage the tubes in the heat exchangers. Our research examines the potential of corrosion of heat exchanger tubes after welding. The typical corrosion process is pitting. The corrosion resistance of stainless steel depends on a protective, passive film formed on the surface of the steel exposed to the service environment. The use of fusion welding for fabrication leads to local variations in the chemical composition inside the material, which may significantly alter the stability of the passive layer and hence the corrosion behavior. The impact of welding parameters (shielding gas, amperage) was examined on corrosion resistance of X6CrNiTi18-10 austenitic stainless steel. The corrosion test was performed according to ASTM G48 standard. The weight loss was measured in Fe(III)-chloride solution by the first corrosion test. The results showed that the corrosion resistance of stainless steel was better at 50 A and 10 l/min welding parameters. During the second test, a potentiodynamic corrosion test was made, and the potentiodynamic curve was measured in 9% saline solution. In this solution, the stainless steel had a better corrosion property because it was measured in a less aggressive medium.

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Corrosion Resistance of TIG Welded Joints of Stainless Steels

Cited by 11 publications

References 3 publications

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

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

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

The Effect of Welding Parameters on the Corrosion Resistance of Austenitic Stainless Steel

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