Study on Mathematical Model of Temperature Field in the Laser Welding Process

Wang, Hong Feng; Zuo, Dun Wen; Huang, Ming Min; Miao, Hong

doi:10.4028/www.scientific.net/kem.426-427.89

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The laser, as it moves, melts new areas of the material, while the previous ones, due to the reduction in T(x, t), resolidify, passing from a liquid to an intermediate state (co-presence of solid and liquid) until only the solid phase is obtained. Further, many models lack the fact that they do not consider convective terms, terms due to irradiation [19,20] and terms due to practical purposes (i.e., taking into account that the welding is performed on a workbench) [16,21].…”

Section: Introduction To the Problemmentioning

confidence: 99%

An Inhomogeneous Model for Laser Welding of Industrial Interest

2023

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An innovative non-homogeneous dynamic model is presented for the recovery of temperature during the industrial laser welding process of Al-Si 5% alloy plates. It considers that, metallurgically, during welding, the alloy melts with the presence of solid/liquid phases until total melt is achieved, and afterwards it resolidifies with the reverse process. Further, a polynomial substitute thermal capacity of the alloy is chosen based on experimental evidence so that the volumetric solid-state fraction is identifiable. Moreover, to the usual radiative/convective boundary conditions, 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 is implemented to recover the temperature maps, obtained by modeling the laser heat sources with formulations depending on the laser sliding speed. The results achieved show good adherence to the experimental evidence, opening up interesting future scenarios for technology transfer.

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Section: Introduction To the Problemmentioning

confidence: 99%

An Inhomogeneous Model for Laser Welding of Industrial Interest

2023

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“…The laser, as it moves, melts new areas of material while the previous ones, due to the reduction of T (x, t), re-solidify passing from a liquid to an intermediate state (co-presence of solid and liquid) until only solid phase is obtained. Further, many models lack the fact that they do not consider convective terms, terms due to irradiation [Wang et al 2021, Belyaev et al 2009] and terms due to practical purposes (i.e., taking into account that the welding is done on a workbench) [Fakir et al 2018, Giglio et al 2021.…”

Section: Introduction To the Problemmentioning

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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Research on experimental parameter selection for measuring thermal diffusivity by laser flash method at room temperature

Sun,

Zhong,

Zhang

et al. 2024

THERM SCI

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Based on the laser flash method, the selection of experimental parameters on the accuracy of measurement results for measuring thermal diffusivity is investigated in this paper. High-purity graphite is employed as the experimental material. Three experimental parameters are taken into consideration, including specimen thickness, laser pulse power, and laser pulse width. Firstly, the principle of the laser flash method is introduced. Then, a numerical simulation model is established and independence tests are performed. In order to investigate the impact of different experimental parameters to the precision of the measurement results using the laser flash method, six thicknesses of the specimens, five laser pulse powers, and five laser pulse widths are selected for numerical simulation and LFA 427 measurement experiments. Finally, an orthogonal design method with three-factor and three-level is constructed to investigate the influence degree of these three factors on the measurement results. It is found that the laser pulse width has the most significant influence, while the laser pulse power has the least impact. For high-purity graphite specimens, it is required to choose a thicker specimen, a lower laser pulse power, and a smaller laser pulse width to ensure better measurement accuracy.

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Study on Mathematical Model of Temperature Field in the Laser Welding Process

Cited by 3 publications

References 6 publications

An Inhomogeneous Model for Laser Welding of Industrial Interest

An Inhomogeneous Model for Laser Welding of Industrial Interest

An Inhomogeneous Model for Laser Welding of Industrial Interest

Research on experimental parameter selection for measuring thermal diffusivity by laser flash method at room temperature

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