Feedback Control of Melt Pool Temperature During Laser Cladding Process

2011 ◽  
Vol 19 (6) ◽  
pp. 1349-1356 ◽  
Author(s):  
Lijun Song ◽  
Jyoti Mazumder
Keyword(s):  
Feedback Control ◽  
Laser Cladding ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
Melt Pool Temperature

Geometry Modelling of Clads Generated by Laser Cladding

2012 ◽  
Vol 713 ◽  
pp. 85-90
Author(s):  
I. Tabernero ◽  
Aitzol Lamikiz ◽  
Eneko Ukar ◽  
S. Martínez
Keyword(s):  
Laser Cladding ◽  
Particle Concentration ◽  
Cfd Model ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
The Finite Difference Method ◽  
Input Variables ◽  
Minimum Heat ◽  
Pool Area ◽  
Deposition Techniques

The laser cladding process is based on the generation of a melt-pool in a substrate where a filler material is injected, generating a high quality clad with a minimum heat affected zone. This process is industrially used to generate coatings over wear or damaged surfaces, being an alternative to traditional deposition techniques. One of the most important aspects for its industrial application is to know the clad geometry in order to calculate the deposited layer thickness. This work presents a model in which, starting from the concentration of injected material and the melt-pool geometry, clad height is finally estimated. Both input variables are obtained by two previous validated models. On one hand, the melt pool is estimated by a thermal model based on the finite difference method, and on the other hand, concentration of injected material is provided by a particle concentration CFD model. This data is used in a mass balance over melt-pool area in order to estimate the deposited clad height.

Modeling on Laser Cladding on In718 Superalloy

2011 ◽  
Vol 80-81 ◽  
pp. 46-50
Author(s):  
Qing Ming Chang ◽  
Chang Jun Chen ◽  
Xia Chen ◽  
Si Qian Bao ◽  
Chen Gang Pan
Keyword(s):  
Laser Cladding ◽  
Process Parameters ◽  
Scanning Speed ◽  
Beam Diameter ◽  
Numerical Resolution ◽  
Applied Loading ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
In718 Superalloy ◽  
Complex Boundary

A 3-D modeling based on the numerical resolution of fluid flow and heat transfer for laser-cladding processes of In718 Superalloy is proposed. The implementation of developed procedures allowed us to treat the problem with specific and complex boundary conditions. The applied loading is a moving heat source that depends on process parameters such as power density, laser beam diameter and scanning speed. The effects of process parameters on the melt pool are quantitatively discussed by numerical analysis. The computational results present good coincidences with the corresponding experiments of laser cladding process.

Laser Cladding of Ni Based Cermets

2006 ◽  
Vol 514-516 ◽  
pp. 723-728 ◽  
Author(s):  
Maria José Tobar ◽  
José Manuel Amado ◽  
Carlos Álvarez ◽  
German Rodríguez ◽  
Armando Yáñez
Keyword(s):  
Melting Point ◽  
Laser Cladding ◽  
Interesting Property ◽  
Major Influence ◽  
Gas Flows ◽  
Tungsten Carbides ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
Plasma Sprayed ◽  
Processing Techniques

The self fluxing NiCrBSi alloys can produce coating layers by means of laser processing techniques. Main procedures are the laser post-treatment of previously thermal or plasma sprayed coats and the laser cladding, for which preplaced or continuously delivered powder (in this case aided by powder feeders) can be used. NiCrBSi alloys have an interesting property due to the presence of boron and silicon in its composition: they exhibit a relatively low melting point, making the laser cladding process easier. The layers obtained on metallic based materials are resistant to high temperature erosion wear and corrosion. However, if additional abrasive wear resistance is needed, the feeding with ceramic powders such as tungsten carbides (WC) is required. The high melting point of ceramics makes the laser cladding process complicated as the melt pool is made up of liquid metal plus not totally melted ceramic particles and the whole suffers the effect of the shielding and carrying gas flows, producing undesired instabilities. In this paper several combination of WC and NiCrBSi powders were tested. It is shown that the WC fraction in the mixture has a major influence on the obtention of pore and crack free clad layers. Bellow a certain ratio the meltpool appears to be more stable and less affected by the different gas flows used in the process, yielding dense NiCrBSi coatings with rather evenly distributed WC particles. In these conditions, the analysis and characterization of the produced coatings shows that the microstructure gains homogeneity without decreasing too much microhardness if compared with the pure ceramic layers.

Analysis of melt pool temperature and stresses in laser cladding of inconel 718

2021 ◽  
Author(s):  
Nikhil Thawari ◽  
Bhushan Mhala ◽  
Chaitanya Gullipalli ◽  
Aayush Chandak ◽  
T. V. K. Gupta
Keyword(s):  
Laser Cladding ◽  
Inconel 718 ◽  
Melt Pool ◽  
Melt Pool Temperature

scholarly journals Research On Energy Distribution and Solidification Characteristics During Laser Cladding Based On Numerical Simulation

2021 ◽  
Author(s):  
Wenhui Yang ◽  
Yanhai Cheng ◽  
Yipeng Zhang ◽  
Jinyong Yang ◽  
Xiubing Liang
Keyword(s):  
Surface Modification ◽  
Numerical Model ◽  
Energy Distribution ◽  
Laser Cladding ◽  
Laser Energy ◽  
Solidification Rate ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
Calculation Results ◽  
Effects Of Temperature

Abstract Laser cladding as an emerging surface modification technology can be widely adopted for surface modification. In this study, 27SiMn was selected as the substrate, the powder was a self-made iron-based alloy, and the thermophysical properties of the material were predicted by the CALPHAD algorithm. The numerical model of the laser cladding process is established by setting reasonable hypothetical condition, initial condition, boundary condition, and solver parameters. In order to verify the accuracy of the numerical model, 10 sets of experiments have been carried out, and the agreement between the model calculation results and the experimental results reached 92%. Through the study of energy distribution in the laser cladding process, it is found that about 10% of the laser energy is used to heat the substrate to form a melt-pool, and at least 53% of the energy is radiated into the environment. Finally, the effects of temperature gradient and solidification rate on the microstructure of the cladding layer were explored.

Sign in / Sign up

Export Citation Format

Share Document