Influence of Laser Beam Shaping on Melt Pool Thermocapillary Flow

Abadi, S.M.A. Noori Rahim; Mi, Yongcui; Sikström, Fredrik; Choquet, Isabelle

doi:10.11159/htff20.125

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Schöler et al [5] developed a model for the calculation of the depth of a circular keyhole by exploiting characteristic time and length scales for laser beam welding processes. Noori Rahim Abadi et al [6] recently used a volume-of-fluid approach within OpenFOAM to investigate the effect of beam shaping on the melt pool behavior in conduction mode laser beam welding. While their implementation was similar, in the model presented in Section 2.1 a crucial component needed for keyhole laser welding was added by implementing an evaporation model.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

et al. 2021

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Keyhole laser beam welding (LBW) of 304L stainless steel sheets with a gap in between was numerically simulated with a three—dimensional, transient, multi—physical model for laser material processing based on the finite volume method (FVM). First, the model’s ability to reproduce experimental results on a relatively coarse computational mesh within reasonable computing time, so as to serve as process optimization tool, is presented. An example of process optimization is shown, wherein a given set of weld seam quality criteria is fulfilled by iteratively optimizing a secondary laser beam. The relatively coarse mesh, in combination with a good model calibration for the experimental conditions, allows for sufficiently fast simulations to use this approach for optimization tasks. Finally, using a finer spatial and temporal discretization, the dynamic processes in the vicinity of the keyhole leading to the formation of pores are investigated. The physical phenomena predicted by the simulation are coherent with experimental observations found in literature.

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Section: Introductionmentioning

confidence: 99%

“…Figure 7. Absorption of laser power by 304L stainless steel at melting point (n = 9.09, κ = 4.21[28]) as a function of incident angle according to Equations (2)-(6).…”

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A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

et al. 2021

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The effect of the laser beam intensity profile in laser-based directed energy deposition: A high-fidelity thermal-fluid modeling approach

Sattari,

Ebrahimi,

Luckabauer

et al. 2024

Additive Manufacturing

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Investigation on the modeling and simulation of hydrodynamics in asymmetric conduction laser micro-welding of austenitic stainless steel and its process optimization

Velázquez de la Hoz,

Cheng

2024

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser micro-welding is a joining technology utilized across various high-value industries, like medical, automotive, e-mobility, and aerospace. A trial-and-error process to identify welding parameters does not necessarily lead to optimized quality levels. Furthermore, offline non-destructive examination methods often launched to verify welding quality may inadvertently trigger excessive costs and time delays, ultimately failing to guarantee defect-free welds. In response to these challenges, this article introduces an advanced multiscale model designed to unravel the intricate dynamics of hydrodynamics and the overarching physics within laser micro-welding melting pools. Developed using the COMSOL software package, the model adeptly demonstrates how surface tension gradients shape the geometry of welds, thus influencing their quality. This knowledge allows the mapping of welding defects. One of the novelties of the article is to introduce geometric dissimilar welding conditions by simulating an asymmetric edge joint. It shows a study on a new, unstudied way to laser weld with many applications in the field. The model further establishes its utility in design experiments to determine parameter, tolerance, and system design. Moreover, the insights garnered from understanding and controlling these drivers have far-reaching implications for the advancement of subsequent methodological research and the development of in-situ quality control practices by characterizing the welding defects. Finally, the results shows that the discouragingly high computational costs restrict its potential application to support a Digital Twin.

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Influence of Laser Beam Shaping on Melt Pool Thermocapillary Flow

Cited by 3 publications

References 21 publications

A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

The effect of the laser beam intensity profile in laser-based directed energy deposition: A high-fidelity thermal-fluid modeling approach

Investigation on the modeling and simulation of hydrodynamics in asymmetric conduction laser micro-welding of austenitic stainless steel and its process optimization

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