Numerical Study of Molten Metal Melt Pool Behaviour during Conduction-mode Laser Spot Melting

Abstract

Molten metal melt pools are characterised by highly non-linear responses, which are very sensitive to imposed boundary conditions. Temporal and spatial variations in the energy flux distribution are often neglected in numerical simulations of melt pool behaviour. Additionally, thermo-physical properties of materials are commonly changed to achieve agreement between predicted melt-pool shape and experimental post-solidification macrograph. Focusing on laser spot melting in conduction mode, we investigated the influence of dynamically adjusted energy flux distribution and changing thermo-physical material properties on melt pool oscillatory behaviour using both deformable and non-deformable assumptions for the gas-metal interface. Our results demonstrate that adjusting the absorbed energy flux affects the oscillatory fluid flow behaviour in the melt pool and consequently the predicted melt-pool shape and size. We also show that changing the thermophysical material properties artificially or using a non-deformable surface assumption lead to significant differences in melt pool oscillatory behaviour compared to the cases in which these assumptions are not made.

arXiv commentJ. Phys. D: Appl. Phys (2020)

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Cited by in corpus (7)

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• Revealing the effects of laser beam shaping on melt pool behaviour in conduction-mode laser melting
• The Effects of Process Parameters on Melt-pool Oscillatory Behaviour in Gas Tungsten Arc Welding
• The Effect of Groove Shape on Molten Metal Flow Behaviour in Gas Metal Arc Welding
• A consistent, volume preserving, and adaptive mesh refinement-based framework for modeling non-isothermal gas-liquid-solid flows with phase change
• The influence of volumetric shrinkage on the metal solidification process under localized energy deposition
• Interplay between Temperature Oscillations and Melt Pool Dynamics in 3D Manufacturing Techniques