A three-dimensional sharp interface model for self-consistent keyhole and weld pool dynamics in deep penetration laser welding
By S. Pang, Liliang Chen, Jianxin Zhou, Yajun Yin, Tao Chen. 2011
269 citations recorded by the source corpus.
A three-dimensional sharp interface model is proposed to investigate the self-consistent keyhole and weld pool dynamics in deep penetration laser welding. The coupling of three-dimensional heat transfer, fluid flow and keyhole free surface evolutions in the welding process is simulated. It is theoretically confirmed that under certain low heat input welding conditions deep penetration laser welding with a collapsing free keyhole could be obtained and the flow directions near the keyhole wall are upwards and approximately parallel to the keyhole wall. However, significantly different weld pool dynamics in a welding process with an unstable keyhole are numerically found. Many flow patterns in the welding process with an unstable keyhole, verified by x-ray transmission experiments, were successfully simulated and analysed. Periodical keyhole collapsing and bubble formation processes are also successfully simulated and believed to be in good agreement with experiments. The mechanisms of keyhole instability are found to be closely associated with the behaviour of humps on the keyhole wall, and it is found that the welding speed and surface tension are closely related to the formation of humps on the keyhole wall. It is also shown that the weld pool dynamics in laser welding with an unstable keyhole are closely associated with the transient keyhole instability and therefore modelling keyhole and weld pool in a self-consistent way is significant to understand the physics of laser welding.
Subfields: Biomedical Engineering, Mechanical Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/27d8c240ecd2973a1c415996e8f032c9b7767d1b
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In Biomedical Engineering
In Mechanical Engineering
In Mechanics of Materials
Citations in the corpus
- [INVITED] An overview of the state of art in laser welding simulation (2016, background): “An application to laser welding simulation can be found in [55] focused on the surface tension treatment.”
- A new approach to compute multi-reflections of laser beam in a keyhole for heat transfer and fluid flow modelling in laser welding (2013, methodology): “The Darcy damping force in equation (3) introduces an isotropic permeability K derived from the Kozeny–Carman equation (7), and is widely used to treat the mushy region [17, 19, 20, 22, 29].”
- Modelling of keyhole dynamics and porosity formation considering the adaptive keyhole shape and three-phase coupling during deep-penetration laser welding (2011, background): “Pang [26] had proposed a three-dimensional sharp interface model to investigate the self-consistent keyhole and molten pool dynamics in deep-penetration laser welding.”
- Effect of Laser-Matter Interaction on Molten Pool Flow and Keyhole Dynamics (2019, methodology): “In the more recent multiphysics modeling of keyhole dynamics [27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39], the ray tracing model is coupled with a computational thermofluidic dynamics model and a free surface tracking model (based on level-set, volume-of-fluid, or arbitrary Lagrangian-Euleri”
- Laser Welding Process – A Review of Keyhole Welding Modelling (2015, background): “In Cho and Na (2006), Lee et al. (2002), Zhou and Tsai (2008), Pang et al. (2011), and Cho et al. (2012), the reference cooling temperature is supposed to be the room temperature.”
- Investigation of keyhole plume and molten pool based on a three-dimensional dynamic model with sharp interface formulation (2013, methodology): “Therefore, equation (9) can be simplified to equation (10) [23],”
- A complete model of keyhole and melt pool dynamics to analyze instabilities and collapse during laser welding (2014, methodology): “Pang et al. 4 have proposed a similar model to predict the keyhole formation using a Level-Set method.”