The Software Development of Double-Beam Centroid Distance Measurement System in Laser Cladding Forming Process

2011 ◽  
Vol 464 ◽  
pp. 524-527
Author(s):  
Cheng Feng Sun ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Chun Sheng Li
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Forming Process ◽  
Development Platform ◽  
Laser Head ◽  
Centroid Distance ◽  
Double Beam ◽  
Spot Image ◽  
The Stability ◽  
Effect Of Light

In the high-piled up process of laser cladding rapid forming , the distance between aser molten pool center and flour will increase along with the cladding layer ,which will cause the effect of light powder coupling getting worse, even directly lead to failure. The article proposed characteristics of the double-spot ,formed by molten pool and reflection of laser surface;used VC++ 6.0 as the development platform of image processing to calculate two spot centroid distance by dealing two spot image with the process of gray processing, Gaussian smoothing, binary threshold segmentation, area centroid calculation, the centroid coordinate distance calculation.At the same time , controlling laser head Z to move in accordance with the value increment,to increase the stability of forming process and forming quality.

Temperature Field Numerical Simulation of Screwy Thin-Walled Part Cladded by Hollow Laser Beam

2013 ◽  
Vol 779-780 ◽  
pp. 410-413
Author(s):  
Hao Lin ◽  
Shi Hong Shi
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Beam ◽  
Laser Cladding ◽  
Molten Pool ◽  
Laser Power ◽  
Forming Process ◽  
Single Laser ◽  
Thin Walled ◽  
Hollow Laser Beam

A numerical simulation model of laser cladding based on internal powder feeding through a hollow laser beam is set up by the Ansys Parametric Design Language (APDL). Through analyzing this model, the saddle-shaped distribution of energy absorbed in scanning direction is found and the molten pool temperature field of single laser cladding is observed like a comet[. Base on the single laser cladding experiments, the initial parameters and test plans of laser cladding and the screwy thin-walled part forming are confirmed. The finite element model of laser cladding forming screwy thin-walled part is established. The evolution of temperature field and thermal cycle of the nodes are studied during the screwy thin-walled part forming process. In the emulation laser power is controlled real time according to the analyses above, and the changing value of laser power is obtained to keep the molten pool temperature steady. The screwy thin-walled part is formed successfully based on these data.

Study on the Stability in Laser Cladding Forming Process of Thin-Wall Structures

2010 ◽  
Vol 148-149 ◽  
pp. 157-162
Author(s):  
Wei Wei Hu ◽  
Jin Wu Kang ◽  
Ji Yu Ma ◽  
Tian You Huang ◽  
Di Chen Li ◽  
...  
Keyword(s):  
Transition Zone ◽  
Laser Cladding ◽  
Laser Power ◽  
Processing Parameters ◽  
Thin Wall ◽  
Forming Process ◽  
Pool Depth ◽  
Melt Pool ◽  
Laser Velocity ◽  
The Stability

The parameters obtained in the study of single layer of laser cladding forming are not suitable for the forming of actual structures. The cooling condition varies with the height of clad layers, which result in instability and then failure of cladding. Therefore, the stability of laser cladding forming is of significance. In this paper, melt pool depth is used as a criteria for stability. And the effect of processing parameters such as laser power and laser velocity on melt pool depth, are investigated by numerical simulation method. The results unveil that there is a transition zone from the beginning to stable stage during laser cladding forming. In the transition zone, laser power should be decreased or laser velocity should be increased to maintain the constant melt pool depth and to ensure the former clad layer would not be remelt. The optimized processing parameters are obtained for stable processing for a thin flat wall and a cylindrical wall, which successfully guide the manufacturing of the real structures.

Dependence of the stability and the beam quality on the distance between two rods in a double laser-head resonator

2002 ◽  
Vol 201 (4-6) ◽  
pp. 381-389 ◽  
Author(s):  
Hyun Su Kim ◽  
Sungman Lee ◽  
Do-Kyeong Ko ◽  
Byung Heon Cha
Keyword(s):  
Beam Quality ◽  
Laser Head ◽  
The Stability

Laser Cladding of Alumina Material Coating: Effects on Deposition Quality

2016 ◽  
Author(s):  
Yuzhou Li ◽  
Weilong Cong ◽  
Fuda Ning ◽  
Rongxia Huang
Keyword(s):  
Laser Cladding ◽  
High Performance ◽  
Ceramic Coating ◽  
High Hardness ◽  
Alumina Ceramic ◽  
Properties Of Coatings ◽  
Surface Protection ◽  
Laser Head ◽  
Coating Methods ◽  
Input Variables

Alumina ceramic is a high performance engineering material with excellent properties, including high melting point, high hardness and brittle nature make the alumina ceramic difficult to machine and needing high cost by using conventional manufacturing methods. Coating is an important method for alumina fabrication. The excellent properties of coatings can be used for special surface protection and ceramic parts repairing. Comparing with other coating methods, laser cladding method has many good properties to overcome the drawbacks. The reported investigations on laser cladding provide little information about alumina materials for ceramic coating. In this paper, effects of different input variables of laser cladding of alumina materials for ceramic coating were studied. And this paper for the first time reported the relationship between the properties (including surface roughness, flatness and powder efficiency) and input variables such as laser power, powder feeding rate and laser head moving rate. The obtained results will be helpful to establish efficient and effective processes for ceramics coating.

An approach to reduce stress and defects: a hybrid process of laser cladding deposition and shot peening

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiaoyu Zhang ◽  
Dichen Li ◽  
Jiale Geng
Keyword(s):  
Tensile Stress ◽  
Compressive Stress ◽  
Laser Cladding ◽  
Shot Peening ◽  
Hybrid Process ◽  
Layer By Layer ◽  
Residual Tensile Stress ◽  
Forming Process ◽  
Content Type ◽  
Thermal Forming

Purpose Laser cladding deposition is limited in industrial application by the micro-defects and residual tensile stress for the thermal forming process, leading to lower fatigue strength compared with that of the forging. The purpose of this paper is to develop an approach to reduce stress and defects. Design/methodology/approach A hybrid process of laser cladding deposition and shot peening is presented to transform surface strengthening technology to the overall strengthening technology through layer-by-layer forming and achieve enhancement. Findings The results show that the surface stress of the sample formed by the hybrid process changed from tensile stress to compressive stress, and the surface compressive stress introduced could reach more than four times the surface tensile stress of the laser cladding sample. At the same time, internal micro-defects such as pores were reduced. The porosity of the sample formed by the hybrid process was reduced by 90.12% than that of the laser cladding sample, and the surface roughness was reduced by 43.16%. Originality/value The authors believe that the hybrid process proposed in this paper can significantly expand the potential application of laser cladding deposition by solving its limitations, promoting its efficiency and applicability in practical cases.

A Numerical Simulation for Fluid Flow and Temperature Field in the Molten Pool of Laser Cladding on Titanium Alloy

Applied laser ◽  
2014 ◽  
Vol 34 (5) ◽  
pp. 389-394
Author(s):  
王维 Wang Wei ◽  
刘奇 Liu Qi ◽  
杨光 Yang Guang ◽  
钦兰云 Qin Lanyun ◽  
薛雄 Xue Xiong
Keyword(s):  
Numerical Simulation ◽  
Titanium Alloy ◽  
Temperature Field ◽  
Fluid Flow ◽  
Laser Cladding ◽  
Molten Pool

Detection and Analysis of Spectrum Distribution of Laser Molten Pool in Nickel Silicon Boron Alloy Powder Laser Cladding

2014 ◽  
Vol 41 (11) ◽  
pp. 1103009
Author(s):  
顾振杰 Gu Zhenjie ◽  
雷剑波 Lei Jianbo ◽  
张传鹏 Zhang Chuanpeng ◽  
王云山 Wang Yunshan
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Alloy Powder ◽  
Spectrum Distribution ◽  
Nickel Silicon

scholarly journals Bending–torsional-coupled vibrations and buckling characteristics of single and double composite Timoshenko beams

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983445
Author(s):  
Ma’en S Sari ◽  
Wael G Al-Kouz ◽  
Rafat Al-Waked
Keyword(s):  
Slenderness Ratio ◽  
Equations Of Motion ◽  
Mode Shapes ◽  
Timoshenko Beams ◽  
Engineering Structures ◽  
Axial Forces ◽  
Double Beam ◽  
Tensile Forces ◽  
Torsional Coupling ◽  
The Stability

The stability and free vibration analyses of single and double composite Timoshenko beams have been investigated. The closed-section beams are subjected to constant axially compressive or tensile forces. The double beams are assumed to be connected by a layer of elastic translational and rotational springs. The coupled governing partial differential equations of motion are discretized, and the resulted eigenvalue problem is solved numerically by applying the Chebyshev spectral collocation method. The effects of the elastic layer parameters, the axial forces, the slenderness ratio, the bending–torsional coupling, and the boundary conditions on the critical buckling loads, mode shapes, and natural transverse frequencies have been studied. A parametric study was performed, and the obtained results revealed different features, which hopefully can be useful for single- and double-beam-like engineering structures.

scholarly journals Choline Salicylate Analysis: Chemical Stability and Degradation Product Identification

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 51
Author(s):  
Katarzyna B. Wróblewska ◽  
Szymon Plewa ◽  
Paweł Dereziński ◽  
Izabela Muszalska-Kolos
Keyword(s):  
Hydrogen Peroxide ◽  
Hplc Analysis ◽  
Degradation Products ◽  
Hydrolytic Degradation ◽  
Acid Media ◽  
Product Identification ◽  
The Stability ◽  
Degradation Degree ◽  
Effect Of Light

Choline salicylate (CS) as a derivative of acetylsalicylic acid is commonly used in different drug forms. In medicine, it is applied topically to inflammation of the oral cavity mucosa and in laryngology. However, this substance in the form of an ionic liquid has not been investigated enough. There are no literature studies on stability tests constituting a stage of pre-formulation research. HPLC (Nucleosil C18, 4.6 × 150 mm, 5 μm; methanol-water-acetic acid 60:40:1, 230 nm or 270 nm) and UV (276 nm) methods for the determination of CS in 2% (g/mL) aqueous solutions were developed. Under stress conditions, CS susceptibility to hydrolytic degradation in aqueous medium, hydrochloric acid, sodium hydroxide, and hydrogen peroxide, and the effect of light on the stability of CS solutions were studied with HPLC analysis. The degradation degree of CS and the purity of the solutions were also tested. Choline salicylate has been qualified as practically stable in neutral and acid media, stable in an alkaline medium, very stable in an oxidizing environment, and photolabile in solution. The HPLC-MS/MS method was used to identify 2,3- and 2,5-dihydroxybenzoic acids as degradation products of CS under the tested conditions.

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