Study on Effect Factors and Control Process of Match between Cladding Powder and Laser Beam in Coaxial Powder Feeding Laser Cladding

2012 ◽  
Vol 184-185 ◽  
pp. 1438-1441
Author(s):  
L. Chen ◽  
X.M. Liu ◽  
F.X. Huang ◽  
J. Chen
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Substrate Surface ◽  
Control Process ◽  
Effective Diameter ◽  
Effect Factors ◽  
Cladding Layer ◽  
Match State ◽  
And Control

In laser cladding, match between the cladding powder beam and the laser beam is an important factors which directly affects the quality of cladding layer. It was conclused that the match principle between the cladding powder beam and the laser beam is that entire cladding powders are heating in effective diameter of laser beam and fall into effective region of laser beam on the substrate surface and combining with the actual match state of cladding powder beam and laser beam.

Research on Technological Parameters of Laser Cladding

2011 ◽  
Vol 117-119 ◽  
pp. 236-240
Author(s):  
Zhong Tang Gao ◽  
Min Hua Zhang
Keyword(s):  
Tissue Distribution ◽  
Laser Cladding ◽  
Process Parameters ◽  
Particle Distribution ◽  
Substrate Surface ◽  
Scanning Speed ◽  
Hard Phase ◽  
Technological Parameters ◽  
Cladding Layer

Send laser cladding experiments to the substrate surface in 16Mn in the Synchronous way. By different laser cladding parameters on the microstructure and mechanical properties under the comparative analysis, to make a more detailed discussion of laser cladding power and scanning speed on the quality of laser cladding. Different process parameters on the microstructure of cladding layer and the cladding layer of particle distribution and the tissue distribution of species .We get to the study that type and distribution of the cladding layer microstructure and tissue distribution of tungsten carbide hard phase. We get regular pattern that technological parameter has an effect on the quality of cladding layer. We can came to the conclusion that the best cladding process parameters is in the power of 3.0KW and cladding speed 1000mm/min.

Numerical Simulation on Temperature Field in Multi-Layers Inside-Beam Powder Feeding when Laser Cladding

2012 ◽  
Vol 499 ◽  
pp. 114-119 ◽  
Author(s):  
Ming Di Wang ◽  
Shi Hong Shi ◽  
X.B. Liu ◽  
Cheng Fa Song ◽  
Li Ning Sun
Keyword(s):  
Numerical Simulation ◽  
Heat Source ◽  
Laser Beam ◽  
Cooling Rate ◽  
Light Source ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Initial Conditions ◽  
Cladding Layer ◽  
Powder Feeding

Numerical simulation of laser cladding is the main research topics for many universities and academes, but all researchers used the Gaussian laser light source. Due to using inside-beam powder feeding for laser cladding, the laser is dispersed by the cone-shaped mirror, and then be focused by the annular mirror, the laser can be assumed as the light source of uniform intensity.In this paper,the temperature of powder during landing selected as the initial conditions, and adopting the life-and-death unit method, the moving point heat source and the uniform heat source are realized. In the thickness direction, using the small melt layer stacking method, a finite element model has been established, and layer unit is acted layer by layer, then a virtual reality laser cladding manu-facturing process is simulated. Calculated results show that the surface temperature of the cladding layer depends on the laser scanning speed, powder feed rate, defocus distance. As cladding layers increases, due to the heat conduction into the base too late, bath temperature will gradually increase. The highest temperature is not at the laser beam, but at the later point of the laser beam. In the clad-ding process, the temperature cooling rate of the cladding layer in high temperature section is great, and in the low-temperature, cooling rate is relatively small. These conclusions are also similar with the normal laser cladding. Finally, some experiments validate the simulation results. The trends of simulating temperature are fit to the actual temperature, and the temperature gradient can also ex-plain the actual shape of cross-section.

The Depositional Laser Cladding with Fiber Laser

2009 ◽  
Vol 628-629 ◽  
pp. 447-452
Author(s):  
Peng Fei Lv ◽  
Ji Min Chen ◽  
F.R. Liu
Keyword(s):  
Particle Size ◽  
Laser Cladding ◽  
Surface Engineering ◽  
Laser Energy ◽  
Thin Layers ◽  
Material Surface ◽  
New Approach ◽  
Mean Particle Size ◽  
Cladding Layer

Laser cladding has been developed as a useful technology to modify material surface in industry. In this paper a new approach of surface modification is introduced. Depositional Laser Cladding (DLC) was developed and the different mechanisms were investigated during the manufacture. Basing on particular analysis of defects in the experiment, the relation between the quality of cladding layer and laser energy density is manifested. Depositional effect and thermal effect play their roles in different place and the depositional effect provides thin layers with the thickness of near mean particle size. Appropriate parameters of laser energy can promote high quality, avoiding pores and stacks in agglomeration and ebullition. Controllable low thickness near mean particle size and sharp edge make it possible to be used on producing certain shape in the surface engineering field, such as restoring and gradient materials.

Experimental Study on Single-Layer Laser Cladding Feeding by Micro/Nano Composite Powders

2013 ◽  
Vol 562-565 ◽  
pp. 958-963
Author(s):  
Ming Di Wang ◽  
Shi Hong Shi ◽  
Hong Yu Wang ◽  
Cheng Feng Sun ◽  
X.B. Liu
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Laser Cladding ◽  
Single Layer ◽  
Composite Powders ◽  
Nano Composite ◽  
Cladding Layer ◽  
Nanocomposite Powders ◽  
Better Than

Aimed at the lack of the cladding materials such as micro or nanopowder, the micro/nanocomposite powders prepared for experiment are feed directly, the key process parameters on the quality of the surface quality and microstructure analysis of the single-layer of laser cladding are studied in detail. Compared to the ordinary laser micro-cladding layer feeding by the micro powder, the cladding layer is more refined, which has more good mechanical properties. The results showed that: using reasonable parameters, the microstructure and macro-morphology of cladding layer with micro-nanocomposite powders feed directly are better than of micron powders.

scholarly journals FINANCIAL SECURITY AND ECONOMIC DEVELOPMENT: METHODS OF ANALYSIS AND RISK MANAGEMENT (THE CASE OF RUSSIA)

2018 ◽  
pp. 68-80
Author(s):  
Natalia Kazakova ◽  
Anna Sivkova
Keyword(s):  
Risk Management ◽  
Control Process ◽  
Control Measures ◽  
General Level ◽  
Financial Security ◽  
Corporate Fraud ◽  
Quality Of Control ◽  
And Control ◽  
Development Methods

Under the conditions of today’s megarisks, the general level of instability of the world economy is only rising, the number of unprofitable organizations with overdue debts increases, and this creates additional threats to financial security of the states. In this regard, the presented research results have scientific and applied importance for risk management of financial security of economic entities on the basis of the suggested control and analytical concept. The suggested concept includes; monitoring, diagnostics, prevention of crisis situations, including bankruptcy, corporate fraud or financial irregularities in the economy. Accounting for the specifics of economic entities in the analysis, diagnostics and control of their activities is aimed at developing an effective management system for corporate fraud and bankruptcy prevention. The conceptual principles of information and analytical support, improved methods used in analyzing, evaluating and monitoring financial security contribute to the development of this methodology for economic analysis and control, ensuring their effectiveness and transparency. The comprehensive toolkit offered here for diagnosing financial security allows identifying the areas of increased bankruptcy risks, fraudulent actions or ineffective business management; unify the control process, thereby reducing labor intensity and improving the quality of control measures.

MILLING FORCE AND SURFACE TOPOGRAPHY OF Ti-6Al-4V TITANIUM ALLOY CLADDED BY THE LASER

2019 ◽  
Vol 26 (05) ◽  
pp. 1850185
Author(s):  
TAO WANG ◽  
YANG LI ◽  
JIAQI LIU ◽  
LINGCHAO QIN ◽  
NING WANG ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Surface Topography ◽  
Laser Cladding ◽  
Milling Process ◽  
Milling Force ◽  
Cladding Layer ◽  
Aero Engine ◽  
Increasing Trend ◽  
Working Performance

After the damaged blade is repaired by laser cladding, the quality of the recontouring by milling determines its working performance in reservice. Ti-6Al-4V, titanium alloy, commonly used as the material of manufacturing aero-engine blades, is selected as the experiment material. Laser cladding technology is used to prepare a cladding layer, and milling experiments are carried out on the cladding layer. The effects of milling process parameters on the milling force, roughness, and surface topography are studied. The results show that when the milling speed ([Formula: see text]) increases to 50[Formula: see text]m/min, the milling force and roughness ([Formula: see text]) reach the maximum and at this moment the surface topography is the worst. Afterwards, with an increase in [Formula: see text], both the milling force and [Formula: see text] decrease in proportion, and the surface topography also becomes better. As the feed per tooth ([Formula: see text]) increases, the milling force and [Formula: see text] also increase. However, the increasing trend gradually slows down. After [Formula: see text] increases to 0.08[Formula: see text]mm/z, the milling force and [Formula: see text] almost no longer increase and the surface topography remains almost unchanged. With an increase in milling width ([Formula: see text]), the milling force and [Formula: see text] increase on the whole. But while [Formula: see text] increases from 0.4[Formula: see text]mm to 0.8[Formula: see text]mm, the milling force and [Formula: see text] increase very slowly. When [Formula: see text] reaches over 0.8[Formula: see text]mm, the milling force and [Formula: see text] increase rapidly again. As [Formula: see text] changes, the surface topography changes according to the milling force and roughness. On this basis, it is found that while machining a laser cladding layer, the milling force directly affects the surface roughness and topography. Therefore, by adjusting [Formula: see text], [Formula: see text], and [Formula: see text], one can obtain the small milling force and good milling surface of the laser cladding TC4 layer.

Preliminary Experimental Study of Laser Cladding Repair on Directionally Solidified Blades

2017 ◽  
Vol 893 ◽  
pp. 289-296
Author(s):  
Wei Fu ◽  
Qi Lin Deng ◽  
Hong Yuan Fang
Keyword(s):  
Experimental Study ◽  
Laser Cladding ◽  
Control Method ◽  
Real Problem ◽  
Paper Study ◽  
Experimental Basis ◽  
Directionally Solidified ◽  
Directional Growth ◽  
Cladding Layer ◽  
And Control

There is large use of directionally solidified superalloy blades in aerospace, but the repair of these blades is a real problem. The laser cladding technology is able to implement the repair. The experiments in this paper study the microstructure of laser cladding, analyze the formation mechanism and control method, implement the directional growth of microstructure in multilevel laser cladding layer, and provide a theoretical and experimental basis of laser cladding repair on directionally solidified superalloy blades.

Influence of Process Parameters on the Quality of Bionic Non-Smooth Coatings by Laser Cladding

2013 ◽  
Vol 744 ◽  
pp. 440-444
Author(s):  
Jing Liu ◽  
Xiao Li Gao ◽  
Yang Xu ◽  
Gang Ling
Keyword(s):  
Laser Cladding ◽  
Interaction Zone ◽  
X Ray Diffraction ◽  
Influence Of Process Parameters ◽  
X Ray ◽  
Cladding Layer ◽  
Metallurgical Bonding ◽  
Hot Rolled ◽  
Hot Rolled Steel

The non-smooth surfaces on 45 steel were prepared by laser cladding with KF-300A alloy powder on the basis of the bionic non-smooth morphology of shark scales. The rib-type coatings were composed of hot-rolled steel 45 and clad layers containing hard phases such as WC/W2C. In this paper, the influence of laser power and defocusing distance on the quality of cladding layer were investigated. The microstructure of the coatings was analyzed by scanning electron microscopy, with attached energy dispersive spectroscopy microprobe, and by X-ray diffraction. SEM inspection of the samples showed that all coatings exhibited similar phases in their microstructure, but the phases presented differ in morphology, size and distribution. Dilution and interaction zone of the coatings were also discussed in this paper. The results showed that the non-smooth coatings were crack-free and had a good metallurgical bonding with 45 steel trenches with a low dilution under the optimum laser conditions (P=700 W, f =14 mm, V=3 mm/s, continuous powder feeding voltage 2.1 V, nitrogen protection).

Financial Security of Economic Activity

2019 ◽  
pp. 110-130
Author(s):  
Natalia Kazakova ◽  
Anna Sivkova
Keyword(s):  
Economic Activity ◽  
Control Process ◽  
Control Measures ◽  
General Level ◽  
Financial Security ◽  
Corporate Fraud ◽  
Quality Of Control ◽  
And Control ◽  
Improved Methods

Under the conditions of megarisks, the general level of the world economy's instability rises, the number of unprofitable organizations with overdue debts increases, thus, creating additional threats to the financial security of states. In this regard, presented here, research results have scientific and applied importance for risk management and financial security of economic entities on the basis of the control and analytical concepts which cover: monitoring, diagnostics, prevention of crisis situations, including bankruptcy, corporate fraud and various other financial irregularities in the economy. Accounting for the specifics of economic entities in the course of analysis, diagnostics, and control over their activities is aimed at the creation of effective corporate fraud prevention and bankruptcy management systems. The conceptual principles of information and analytical support, improved methods for analyzing, and evaluating and monitoring financial security contributes to the development of a common methodology for economic analysis and control activities, ensuring their effectiveness and transparency. The comprehensive toolkit for diagnosing financial security allows identifying the areas of increased bankruptcy risks, fraudulent actions or ineffective business management; and unifies the control process, thereby reducing labor intensity and improving the quality of control measures.

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