A keyhole volumetric model for weld pool analysis in Nd:YAG pulsed laser welding

Kuang, Jao-Hwa; Hung, Tsung-Pin; Chen, Chih-Kuan

doi:10.1016/j.optlastec.2011.12.006

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…In Ref. [10] applies two different heat transfer models, namely, a surface flux heat transfer model in the low energy intensity region of the weld and a keyhole heat transfer model based on a volumetric heat source in the high energy intensity region of the weld. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Solana et al [6][7][8] modeled a mathematical model to calculate the keyhole geometry during the laser drilling of metals. Some researchers [9][10][11] adopted body heat source in the laser beam welding simulation, the power density distribution of keyhole didnot meet the fact. Na et al [12][13][14] used ray tracing technique to model a keyhole with multiple reflections in Fresnel absorption, and the simulation results agreed with the experimental ones.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of keyhole dynamics and analysis of energy absorption efficiency based on Fresnel law during deep-penetration laser spot welding

Shen

et al. 2015

Computational Materials Science

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of keyhole dynamics and analysis of energy absorption efficiency based on Fresnel law during deep-penetration laser spot welding

Shen

et al. 2015

Computational Materials Science

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“…The surface heat source model is more accurate for conduction welding since in this mode the energy is applied to the component surface, while the volumetric heat source is more adapted for keyhole welding, with the energy being directed inside the medium through the keyhole [3]. The volumetric heat sources are the most studied distribution for over the years [16].…”

Section: Heat Source Modelmentioning

confidence: 99%

“…It has been found that the value of the transition zone ratio varies with laser beam diameter and speed [2]. For a model to be able to simulate both modes, the formation of the keyhole has to be simulated, or different heat sources have to be used for conduction and keyhole mode [3]. In this study two heat sources are used.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Weld Joint Shape and Dimensions in Laser Welding Using a 3D Modeling and Experimental Validation

Jacques¹,

Ouafi²

2017

MSA

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This paper presents an experimentally validated weld joint shape and dimensions predictive 3D modeling for low carbon galvanized steel in butt-joint configurations. The proposed modelling approach is based on metallurgical transformations using temperature dependent material properties and the enthalpy method. Conduction and keyhole modes welding are investigated using surface and volumetric heat sources, respectively. Transition between the heat sources is carried out according to the power density and interaction time. Simulations are carried out using 3D finite element model on commercial software. The simulation results of the weld shape and dimensions are validated using a structured experimental investigation based on Taguchi method. Experimental validation conducted on a 3 kW Nd: YAG laser source reveals that the modelling approach can provide not only a consistent and accurate prediction of the weld characteristics under variable welding parameters and conditions but also a comprehensive and quantitative analysis of process parameters effects. The results show great concordance between predicted and measured values for the weld joint shape and dimensions.

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“…Mackwood and Crafer [1] and Abderrazak et al [26] carried out extended reviews of the different analytical and numerical solutions commonly employed in the simulation of laser welding. In the literature, numerous works [26][27][28][29][30][31][32][33][34][35][36][37] related to simulation of laser keyhole welding can be found, but most of them are focused only on the study of the thermal fields and weld pool geometry (bead length and width and depth of penetration). In fact, few or none of these works focus their studies on modeling microstructure, hardness, and, more important, the residual stresses generated in laser welding of dissimilar metals.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Laser Keyhole Welding Strategies of Dissimilar Metals by FEM Simulation

Navas

Leunda

Lambarri

et al. 2015

Metall Mater Trans A

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Laser keyhole welding of dissimilar metals has been simulated to study the effect of welding strategies (laser beam displacements and tilts) and combination of metals to be welded on final quality of the joints. Molten pool geometry and welding penetration have been studied but special attention has been paid to final joint material properties, such as microstructure/phases and hardness, and especially to the residual stress state because it greatly conditions the service life of laser-welded components. For a fixed strategy (laser beam perpendicular to the joint) austenitic to carbon steel laser welding leads to residual stresses at the joint area very similar to those obtained in austenitic to martensitic steel welding, but welding of steel to Inconel 718 results in steeper residual stress gradients and higher area at the joint with detrimental tensile stresses. Therefore, when the difference in thermo-mechanical properties of the metals to be welded is higher, the stress state generated is more detrimental for the service life of the component, and consequently more relevant is the optimization of welding strategy. In laser keyhole welding of austenitic to martensitic stainless steel and austenitic to carbon steel, the optimum welding strategy is displacing the laser beam 1 mm toward the austenitic steel. In the case of austenitic steel to Inconel welding, the optimum welding strategy consists in setting the heat source tilted 45 deg and moved 2 mm toward the austenitic steel.

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A keyhole volumetric model for weld pool analysis in Nd:YAG pulsed laser welding

Cited by 16 publications

References 23 publications

Modeling of keyhole dynamics and analysis of energy absorption efficiency based on Fresnel law during deep-penetration laser spot welding

Modeling of keyhole dynamics and analysis of energy absorption efficiency based on Fresnel law during deep-penetration laser spot welding

Prediction of Weld Joint Shape and Dimensions in Laser Welding Using a 3D Modeling and Experimental Validation

Optimization of Laser Keyhole Welding Strategies of Dissimilar Metals by FEM Simulation

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