Influência do Aporte Térmico sobre as Características e Propriedades de Cordões de Solda dos Aços AISI 316 e AISI 316L

Silva, Rafaela dos Santos; Demarque, Rudineli; Santos, Ellem Patrícia dos; Castro, José Adilson de

doi:10.1590/0104-9224/si25.04

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Through an analysis of the loads on the fitting under working conditions, the stress on the seal weld of the fitting under working conditions was captured, as depicted in Figure 4. The fitting was subjected to liquefied natural gas pressure, and, concurrently, the temperature stress at the weld was created by the existence of a temperature difference between the inner and outer walls [23,24]. These two types of loads interacted to affect the fitting's sealing performance.…”

Section: Model Of the Fitting Seal Structurementioning

confidence: 99%

Thermo-Mechanical Coupling Analysis of the Sealing Structure Stress of LNG Cryogenic Hose Fittings

Yang,

Liu,

Liu

et al. 2024

JMSE

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A cryogenic hose is used to transport liquefied natural gas at sea, where flexible fittings are sealed by corrugated lining and end flange welding. However, the extreme cryogenic temperatures of the conveyed fluid introduce substantial challenges to the integrity of the fitting seals’ structure during the LNG transfer process. In order to study the sealing performance of the fitting under LNG conveying conditions, this paper was based on the general finite element software ABAQUS 6.11 to carry out a thermo-mechanical coupling analysis of the end sealing stress. This paper also established a sealing performance analysis model of the corrugated fitting welding area under the fitting action of LNG load and internal pressure load. A sensitivity analysis was conducted on the influence of weld clearance, blunt edge size, and weld residual height on the weld stress of a fitting ring. The results show that, under the combined action of the medium internal pressure and cryogenic load, the size design of the weld area significantly affects the sealing performance of the fitting, among which the equivalent force of the weld clearance butt sealing area has the greatest impact. Moreover, it was found that a pressure of 5 MPa was 2 mm when the weld clearance was 2 mm, and the average stress at the weld was 53.68 MPa. Further, considering the synergistic influence of the blunt edge size, the weld clearance was 3 mm, the stress was minimal when the blunt side size was 4 mm, and the average stress was 17.42 MPa. These research results can serve as a reference for the design and analysis of the sealing structure of non-adhesive inner corrugated cryogenic hose fittings.

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Section: Model Of the Fitting Seal Structurementioning

confidence: 99%

Thermo-Mechanical Coupling Analysis of the Sealing Structure Stress of LNG Cryogenic Hose Fittings

Yang,

Liu,

Liu

et al. 2024

JMSE

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“…This increases the dendrite spacing and decreases the δ ferrite fraction since, according to Lippold and Kotecki [26], the austenite that forms during solidification consumes part of the ferrite. A study developed by Silva et al [30] had already shown that when welding AISI 316L steel using the autogenous GTAW method, the dendrite spacing increases according to the increase in heat input. In this study, it is observed that the same is valid for dissimilar welding.…”

Section: Analysis Of Welded Samplesmentioning

confidence: 99%

Analysis of Dissimilar Welding Joint between Inconel 718 and AISI 316L by GTAW Multipass Process

et al. 2022

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AISI 316L steel and Inconel 718 are metals of wide application in industries. The study of dissimilar welding between these two materials is technologically important to improve their joint performance. We focused this study on the evaluation of the dissimilar weldability of these materials. Three samples of AISI 316L and Inconel 718 welded using a multipass GTAW (Gas Tungsten Arc Welding) process with different parameters were analyzed. The microstructural characterization, measurements of the volumetric fraction of the δ ferrite and Laves phase, the spacing between austenite dendrites, in addition to measurement and analysis of dimensions of the welding zones and the microhardness were performed. The measurement of the weld metal dimensions and the dendrite spacing showed that higher heat inputs increased the dilution zones and the spacing between austenite dendrites. The volumetric fraction of the δ ferrite decreased with the increase of heat input, while the Laves phase fraction increased. The microhardness presented significant variation in the weld pool due to changes in the phases and composition, as evidenced by EDS analysis in the dissimilar joints.

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Influência do Aporte Térmico sobre as Características e Propriedades de Cordões de Solda dos Aços AISI 316 e AISI 316L

Cited by 2 publications

References 9 publications

Thermo-Mechanical Coupling Analysis of the Sealing Structure Stress of LNG Cryogenic Hose Fittings

Thermo-Mechanical Coupling Analysis of the Sealing Structure Stress of LNG Cryogenic Hose Fittings

Analysis of Dissimilar Welding Joint between Inconel 718 and AISI 316L by GTAW Multipass Process

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