Melt pool temperature control using LabVIEW in Nd:YAG laser blown powder cladding process

Salehi, Dariush; Brandt, Milan

doi:10.1007/s00170-005-2514-3

Cited by 123 publications

(43 citation statements)

References 8 publications

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“…Other physical properties in the unified model also are complemented accordingly following Eqs. [10] and [11]. The Delta function d(/) deriving from the Heaviside function is applied to ensure the force acting on the L/G interface is as follows:…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…[8][9][10] Strong sources of heat convection definitely are in the molten pool as a result of temperature-dependent surface tension variation over the molten pool free surface and a density variation in the bulk of the molten pool, respectively. However, a limited attempt has been accomplished to study the fluid flow combined with solute diffusion in the molten pool of laser cladding.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of Heat Transfer and Fluid Flow in the Laser Multilayered Cladding Process

Kong

Kovacevic

2010

Metall Mater Trans B

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The current work examines the heat-and-mass transfer process in the laser multilayered cladding of H13 tool steel powder by numerical modeling and experimental validation. A multiphase transient model is developed to investigate the evolution of the temperature field and flow velocity of the liquid phase in the molten pool. The solid region of the substrate and solidified clad, the liquid region of the melted clad material, and the gas region of the surrounding air are included. In this model, a level-set method is used to track the free surface motion of the molten pool with the powder material feeding and scanning of the laser beam. An enthalpy-porosity approach is applied to deal with the solidification and melting that occurs in the cladding process. Moreover, the laser heat input and heat losses from the forced convection and heat radiation that occurs on the top surface of the deposited layer are incorporated into the source term of the governing equations. The effects of the laser power, scanning speed, and powderfeed rate on the dilution and height of the multilayered clad are investigated based on the numerical model and experimental measurements. The results show that an increase of the laser power and powder feed rate, or a reduction of the scanning speed, can increase the clad height and directly influence the remelted depth of each layer of deposition. The numerical results have a qualitative agreement with the experimental measurements.

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Section: Mathematical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Heat Transfer and Fluid Flow in the Laser Multilayered Cladding Process

Kong

Kovacevic

2010

Metall Mater Trans B

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“…Compensation for the lack of deposition with the closed-loop controller was demonstrated by cladding on a stepped surface. Salehi and Brandt [18] developed a PID controller to control melt pool temperature during laser cladding. The quality of clad layer in terms of its dilution and the extent of HAZ was investigated, and it was shown that control of temperature alone will not produce desired cladding results.…”

Section: Introductionmentioning

confidence: 99%

Real-time control of microstructure in laser additive manufacturing

Farshidianfar

Khajepour

Gerlich

2015

Int J Adv Manuf Technol

102

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A novel closed-loop process is demonstrated to control deposition microstructure during laser additive manufacturing (LAM) in real-time. An infrared imaging system is developed to monitor surface temperatures during the process as feedback signals. Cooling rates and melt pool temperatures are recorded in real-time to provide adequate information regarding thermal gradients, and thus control the deposition microstructure affected by cooling rates during LAM. Using correlations between the cooling rate, traveling speed, and the clad microstructure, a novel feedback PID controller is established to control the cooling rate. The controller is designed to maintain the cooling rate around a desired point by tuning the traveling speed. The performance of the controller is examined on several single-track and multi-track closedloop claddings in order to achieve desired microstructures with specific properties. Results indicate that the closed-loop controller is capable of generating a consistent controlled microstructure during the LAM process in real-time.

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“…Some research on the temperature field and morphology of molten pool has been carried out at home and abroad [1][2][3][4][5][6][7][8]. And there is also some further research which has established closed-loop controlled system of laser cladding based on the molten pool measurement [9][10][11]. Promisingly, the control system achieves good outcome.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Molten Pool Image during Laser Cladding Process

Deng¹,

Fu²,

Chen³

et al. 2014

Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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Abstract-Laser cladding is mainly applied in components renovation, coating, stacking forming, etc. At present, the degree of automation of laser cladding is not very high. Machine vision technology is gradually becoming a good approach to improve the automaticity. Utilizing machine vision to measure and control the molten pool to improve the degree of automation of laser cladding has become an important research interest. Clear image of molten pool was acquired with the appropriate image grabbing installation system and together with image processing methods, the area of molten pool was calculated. Analyzed variation of molten pool area as the processing parameters changed. Discussed variation of geometry of cross section of cladding bead. Explained the relationship between variation of the molten pool areas and cross section of cladding bead, according to the captured image of molten pool. When molten pool increases, it can capture more metal powder, so area of cross section of cladding bead will increase correspondingly. With appropriate processing parameters, the areas of molten pool and cross section of cladding bead are in positive correlation.

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Melt pool temperature control using LabVIEW in Nd:YAG laser blown powder cladding process

Cited by 123 publications

References 8 publications

Modeling of Heat Transfer and Fluid Flow in the Laser Multilayered Cladding Process

Modeling of Heat Transfer and Fluid Flow in the Laser Multilayered Cladding Process

Real-time control of microstructure in laser additive manufacturing

Measurement of the Molten Pool Image during Laser Cladding Process

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