Modeling of frictions on keyhole walls during vapor flow in laser welding

Amara, El-Hachemi; Fabbro, R.; Achab, L.; Hamadi, F.; Mebani, N.

doi:10.2351/1.5060301

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…For the iron, B o = 3.9 × 10 12 kg m −1 s −2 and L v = 6.088 × 10 6 J kg −1 . • The interaction of the vapour flow and the metallic liquid was particularly investigated in [29,30]. The metallic vapour produced inside the cavity, during laser energy absorption, flows towards the keyhole exit, and its behaviour is determined by solving the set of equations ( 8)- (10).…”

Section: The Melt Pool Dynamicsmentioning

confidence: 99%

Modelling of gas jet effect on the melt pool movements during deep penetration laser welding

Amara¹,

Fabbro

2008

J. Phys. D: Appl. Phys.

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A modelling of the induced melt pool movements during iron deep penetration welding by CW Nd–YAG laser beam is developed, with the aim of studying the effect of inert gas jet on the liquid metal flow. The keyhole shape is calculated as a function of the operating parameters and the derived boundary conditions on the keyhole walls are used, by applying a solidification model, to calculate the frontiers of the assumed stationary molten pool. The vapour flow generated inside the keyhole, the surface tension and the recoil pressure are considered as the mechanisms producing the melt pool movements, and the evolution of the interfaces between the keyhole, the molten pool and the surrounding air is simulated by the multiphase volume of fluid method. We demonstrate, in accordance with the experimental observations, that an important stirring effect is generated inside the melt pool, and moreover by extending the modelling to the study of the effect of 45° inert gas projection at 100 m s−1 on the metallic liquid pool, it is shown that a more uniform flow is obtained.

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Section: The Melt Pool Dynamicsmentioning

confidence: 99%

Modelling of gas jet effect on the melt pool movements during deep penetration laser welding

Amara¹,

Fabbro

2008

J. Phys. D: Appl. Phys.

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“…The normal stress on the keyhole boundary is assumed to be the function of temperature. According to reference [6], the additional velocity of fluid flow in the weld pool duo to the metallic vapor shear stress can be written as follows: The liquid flow induced velocity u 0 is given as a function of the metallic vapor shear stress τ g , the melted metal dynamic viscosity η l , density ρ l and the length L from local shear stress position to the keyhole bottom on the keyhole rear wall. The normal pressure on the keyhole boundary can be written as follows:…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Modeling the pressure balance of the keyhole and the velocity field in the laser keyhole welding pool has been contacted by a number of researchers [1][2][3][4]. There are several driving mechanisms of fluid flow in laser weld pool, where the forces result from temperature-dependent surface tension [5,4], the friction force of the metal vapor escaping from the keyhole [6], density variations and the movement of the keyhole relative to the work piece. Buoyancy force is created as a result of density variations within the weld pool, which is the result of the spatial temperature gradient in the pool.…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure gradient driven convection in the molten pool during the deep penetration laser welding

Wang

Shi

Gong

2007

Journal of Materials Processing Technology

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A Review on Melt‐Pool Characteristics in Laser Welding of Metals

Fotovvati

Wayne

Lewis

et al. 2018

Advances in Materials Science and Engineering

138

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Laser welding of metals involves with formation of a melt-pool and subsequent rapid solidification, resulting in alteration of properties and the microstructure of the welded metal. Understanding and predicting relationships between laser welding process parameters, such as laser speed and welding power, and melt-pool characteristics have been the subjects of many studies in literature because this knowledge is critical to controlling and improving laser welding. Recent advances in metal additive manufacturing processes have renewed interest in the melt-pool studies because in many of these processes, part fabrication involves small moving melt-pools. e present work is a critical review of the literature on experimental and modeling studies on laser welding, with the focus being on the influence of process parameters on geometry, thermodynamics, fluid dynamics, microstructure, and porosity characteristics of the melt-pool. ese data may inform future experimental laser welding studies and may be used for verification and validation of results obtained in future melt-pool modeling studies.

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Modeling of frictions on keyhole walls during vapor flow in laser welding

Cited by 4 publications

References 10 publications

Modelling of gas jet effect on the melt pool movements during deep penetration laser welding

Modelling of gas jet effect on the melt pool movements during deep penetration laser welding

Effect of pressure gradient driven convection in the molten pool during the deep penetration laser welding

A Review on Melt‐Pool Characteristics in Laser Welding of Metals

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