A Study on the Enhanced Process of Elaborate Heat Source Model Parameters for Flux Core Arc Welding of 9% Nickel Steel for Cryogenic Storage Tank

Pyo, Changmin; Jeong, Se-Min; Kim, Jae-Woong; Park, Min‐Ho; Shin, Jihoon; Kim, Younghyun; Son, Joon-Sik; Kim, Jeong-Hwan; Kim, Myoung-Ho

doi:10.3390/jmse10121810

Cited by 6 publications

(11 citation statements)

References 43 publications

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“…Farias et al proposed a new heat source geometry based on Goldak's double ellipsoid model and applied a genetic algorithm to estimate the heat source for arc welding [39,40]. Meanwhile, Pyo used adaptive simulated annealing (ASA) to estimate the arc welding heat source [41]. The Goldak double ellipsoid model (Figure 7) is the most used heat source model in finite element analysis of arc welding, defined by the governing Equations ( 1)-( 5).…”

Section: Goldak Model Heat Sourcementioning

confidence: 99%

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An Improved Method for Deriving the Heat Source Model for FCAW of 9% Nickel Steel for Cryogenic Tanks

Kim,

Park

et al. 2023

Materials

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The International Maritime Organization (IMO) is tightening regulations on air pollutants. Consequently, more LNG-powered ships are being used to adhere to the sulfur oxide regulations. Among the tank materials for storing LNG, 9% nickel steel is widely used for cryogenic tanks and containers due to its high cryogenic impact toughness and high yield strength. Hence, numerous studies have sought to predict 9% nickel steel welding distortion. Previously, a methodology to derive the optimal parameters constituting the Goldak welding heat source for arc welding was developed. This was achieved by integrating heat transfer finite element analysis and optimization algorithms. However, this process is time-consuming, and the resulting shape of the weld differs by ~15% from its actual size. Therefore, this study proposes a simplified model to reduce the analysis time required for the arc welding process. Moreover, a new objective function and temperature constraints are presented to derive a more sophisticated heat source model for arc welding. As a result, the analysis time was reduced by ~70% compared to that previously reported, and the error rates of the weld geometry and HAZ size were within 10% and 15% of the actual weld, respectively. The findings of this study provide a strategy to rapidly predict welding distortion in the field, which can inform the revision of welding guidelines and overall welded structure designs.

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Section: Goldak Model Heat Sourcementioning

confidence: 99%

Section: Goldak Model Heat Sourcementioning

confidence: 99%

An Improved Method for Deriving the Heat Source Model for FCAW of 9% Nickel Steel for Cryogenic Tanks

Kim,

Park

et al. 2023

Materials

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“…As a further term of comparison, we exploit this interesting formulation, depicted in Fig. 6, formulated as [Pyo et al 2022]…”

Section: Ellipsoid Laser Heat Sourcementioning

confidence: 99%

“…where a, b, c are the length, the width, the depth respectively [Pyo et al 2022, Goldak et al 2005, Chen et al 2020].…”

Section: Ellipsoid Laser Heat Sourcementioning

confidence: 99%

An Inhomogeneous Model for Laser Welding of Industrial Interest

Munafó

Palumbo

Versaci

2023

Preprint

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An innovative non-homogeneous dynamic model for recovering the absolute temperature during the laser welding process of Al-Si 5% alloy plates, as per the industrial activity of an Italian company with proven experience operating in the laser welding area, is presented here. Firstly, the model considers that, metallurgically, during welding, the alloy melts with the presence of solid/liquid phases until total melting, and after-wards re-solidifies with the reverse process. Further, a particular polynomial substitute thermal capacity of the alloy has been chosen, according to experimental evidence, so that the volumetric solid state fraction is easily identifiable. Moreover, to the usual radiative/convective boundary conditions, to make the model more realistic, the contribution due to the positioning of the plates on the workbench is considered (endowing the model with Cauchy-Stefan-Boltzmann boundary conditions). Having verified the well-posedness of the problem, a Galerkin-FEM approach has been implemented on MatLab PDE ToolBox to numerically recover the absolute temperature maps, obtained by modeling the heat sources due to the laser with formulations depending on the laser sliding speed. The results achieved have shown good adherence to the experimental evidence, opening up interesting future scenarios for technology transfer.

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“…Nickel, as an industrial metal, has extremely important applications in many engineering fields, such as airplanes, radars, and batteries, due to its excellent ductility, magnetism, and mechanical properties [1][2][3][4]. In addition, nickel itself is not easily corroded and is widely used as a protective layer on device surfaces [5,6].…”

Section: Introductionmentioning

confidence: 99%

Wire Electrochemical Etching of Superhydrophobic Nickel Surfaces with Enhanced Corrosion Protection

Wu,

Yan,

Lin

et al. 2023

Materials

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Superhydrophobic nickel surfaces have significant advantages in the field of corrosion protection compared with traditional nickel corrosion protection methods which need a toxic chemical corrosion inhibitor. Electrochemical etching, an ideal method for fabricating superhydrophobic nickel surfaces, was also limited by low current density, resulting in low processing efficiency. To overcome this limitation, we proposed a new method to fabricate a superhydrophobic nickel surface using a wire electrochemical etching method. The wire electrochemical etching method accomplished the etching process by sweeping a controlled wire cathode across the surface of the anode nickel plate in an environmentally friendly neutral electrolyte, NaCl. The superhydrophobic nickel sample with a contact angle of 153° and a rolling angle of 10° could be fabricated by wire electrochemical etching and modification. Additionally, the optimal parameters of the wire electrochemical etching and the principle of superhydrophobic surface formation had also been systematically investigated, respectively. Moreover, the superhydrophobic nickel surface had self-cleaning performance, antifouling performance, corrosion protection, and abrasion resistance. Wire electrochemical etching improves the current density of processing, which means that this method improves the processing efficiency for fabricating a superhydrophobic nickel surface. This work is expected to enrich the theory and technology for fabricating superhydrophobic nickel surfaces to improve the corrosion protection of nickel.

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A Study on the Enhanced Process of Elaborate Heat Source Model Parameters for Flux Core Arc Welding of 9% Nickel Steel for Cryogenic Storage Tank

Cited by 6 publications

References 43 publications

An Improved Method for Deriving the Heat Source Model for FCAW of 9% Nickel Steel for Cryogenic Tanks

An Improved Method for Deriving the Heat Source Model for FCAW of 9% Nickel Steel for Cryogenic Tanks

An Inhomogeneous Model for Laser Welding of Industrial Interest

Wire Electrochemical Etching of Superhydrophobic Nickel Surfaces with Enhanced Corrosion Protection

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