Effect of solubilization heat treatment on microstructure and corrosion resistance of joints welded with the autogenous TIG process duplex stainless steel

Pinheiro, Flávia Wagner; Souza, Lucas Menezes de; Pereira, Elaine Cristina; Monteiro, Sérgio Neves; Azevedo, Afonso Rangel Garcez de

doi:10.1016/j.jmrt.2023.08.014

Cited by 5 publications

(3 citation statements)

References 21 publications

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Section: Resultssupporting

confidence: 92%

“…It was possible to observe that the region of the heat-affected zone (HAZ) has a percentage of ferrite higher than the fusion zone; this is due to the heating occurring from the ends to the center of the weld bead. The results corroborate with those of the authors' [28][29][30]. In order to verify the influence of each variable, the analyses were performed in groups according to Table 5, where, among the three variables of interest, only one had its values changed.…”

Section: Resultssupporting

confidence: 86%

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Influence of Pulsed Arc Parameters on the Tig Welding Process for the Stainless Steel Duplex UNS S31803

Generoso,

Souza,

Pereira

et al. 2023

Materials

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The influence of parameters involved in the pulsed electric arc, used as an energy source in the tungsten inert gas (TIG)-mediated welding of Duplex UNS S31803 stainless steel, to attend the manufacture of flexible pipes for the extraction of oil and gas is presented. A fundamental part in the manufacturing process of flexible pipelines is the welding of these strips so that corresponding TIG welds will be subjected to the same process and work conditions. Therefore, it is necessary to maintain the same properties in the welded regions. Covering the effects of each parameter of the pulsed electric arc such as peak and base current as welds, cyclic ratio, and pulsation frequency is a desirable endeavor. The final objective is the mitigation of problems that have a great impact on production, such as weld breakage during the conformation of the strip in the process and test failures. With this, tensile, bending, and ferrite percentage tests were performed on 12 samples that qualified as satisfactory in the visual aspect. A minimum tensile strength of 734.57 MPa and a maximum of 775.77 MPa were obtained where all values found are above the tensile strength limit of the base material of 620 MPa. With the completion of the study, it is possible to understand not only the response of the process to each parameter but also the tendency when changing them. Moreover, it is possible to explore the possibility of guiding the changes to achieve results about the visual aspect and the mechanical properties of the welded material.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 86%

Influence of Pulsed Arc Parameters on the Tig Welding Process for the Stainless Steel Duplex UNS S31803

Generoso,

Souza,

Pereira

et al. 2023

Materials

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“…During welding, the inclusion of alloying elements and adjustments in the heat input influence the ferrite and austenite phase content within the weld. Achieving an appropriate ferrite-to-austenite phase ratio is a crucial determinant of the welded joint's mechanical properties [10,[19][20][21]. In the context of stainless-steel thick-walled structural components, A-TIG welding primarily counters the Marangoni convection within the molten pool, significantly augmenting weld penetration and thereby reducing the width of the heat-affected zone [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Improving Welding Penetration and Mechanical Properties via Activated-Flux Smearing by Tungsten Inert Gas Arc Welding

Yue,

Huang,

et al. 2023

Metals

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For the welding process of thick-walled structural components in liquid rocket engines, the activated-flux TIG method can effectively address issues such as the formation of intermetallic phases in the weld seams, thereby enhancing mechanical performance. The present study investigates the activated-flux TIG welding technique on 10mm thick 1Cr21Ni5Ti duplex stainless steel plates. Various activated-flux, including -SiO2, TiO2, V2O5, NiO, MnO2, CaO, AlCl3, CaF2, B2O3 Cr2O3, and Al2O3, were examined to understand their impact on the weld-bead geometry. The aim was to determine the optimal activator ratio for the effective welding of 1Cr21Ni5Ti duplex stainless steel. The weld-shift experiment confirmed that the deep penetration observed in flux-assisted welding is attributed to Marangoni convection in the molten pool. Comprehensive evaluations and analyses were performed on the microstructure and mechanical properties of the normal welded joint and the A-TIG welded joint. Finally, the study delves into a discussion on the factors influencing changes in the weld penetration, microstructure, and mechanical properties of the weld.

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Effect of Nitrogen‐Added Shielding Gas on Microstructure Evolution of Welded Joints by Gas Tungsten Arc Welding Process in Duplex Stainless Steel 2205

Rodriguez‐Vargas,

Stornelli,

Miranda Pérez

et al. 2024

steel research int.

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Duplex stainless steels (DSS), due to their high corrosion resistance, primarily attributed to their austenite‐ferrite duplex microstructure, are widely used in industrial sector such as petrolchimical and gas natural industries. Maintaining this microstructure is crucial during manufacturing processes, including welding which presents the challenge of minimizing ferritization in the heat‐affected zone (HAZ) or weld zone (WZ), as it can significantly reduce their corrosion resistance. This work aims to describe the influence of nitrogen gas in the Ar–N2 shielding atmosphere when depositing beads on 2205 DSS plates, using a gas tungsten arc welding (GTAW) process. It is observed that at low nitrogen load (98%Ar–2%N2), the austenite content reaches 49% in WZ and 29% in HAZ. When the nitrogen percentage is increased (50%Ar–50%N2), the austenite content rises to 67% and 37%, respectively. The joint is evaluated macro‐ and microstructurally to observe the atmosphere impact on weld bead geometry and microstructural development. Additionally, hardness is assessed throughout the weld bead. The work demonstrates that, with a 50%Ar–50%N2 shielding gas mixture, it is possible to limit the formation of ferrite in the WZ and HAZ of DSS during the welding process, without altering the microhardness trend of the welded joint.

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Effect of solubilization heat treatment on microstructure and corrosion resistance of joints welded with the autogenous TIG process duplex stainless steel

Cited by 5 publications

References 21 publications

Influence of Pulsed Arc Parameters on the Tig Welding Process for the Stainless Steel Duplex UNS S31803

Influence of Pulsed Arc Parameters on the Tig Welding Process for the Stainless Steel Duplex UNS S31803

Improving Welding Penetration and Mechanical Properties via Activated-Flux Smearing by Tungsten Inert Gas Arc Welding

Effect of Nitrogen‐Added Shielding Gas on Microstructure Evolution of Welded Joints by Gas Tungsten Arc Welding Process in Duplex Stainless Steel 2205

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