Composite Polymer Joining by Laser Combined Hybrid Laser Process

2014 ◽  
Vol 875-877 ◽  
pp. 1362-1366 ◽  
Author(s):  
Hae Woon Choi ◽  
Jin Young Yoon
Keyword(s):  
Laser Power ◽  
Laser Scanning ◽  
Laser System ◽  
Scanning Speed ◽  
Cnc Machining ◽  
Maximum Speed ◽  
Scanning System ◽  
Manufacturing Cost ◽  
Polymer Joining ◽  
High Flexibility

A novel hybrid process (2D scanner + LASER + CNC machining) was used to join transparent and opaque polymers. A 30W diode laser and a 3-axis CNC machining center were combined to accommodate a 2D scanning system for high flexibility and productivity. The scanning speed, the number of repetitions and the laser power were selected as parameters for the weld test. By combining CNC and laser, the productivity and accuracy were improved and manufacturing cost decreased accordingly. The maximum speed of 1130 mm/min was achieved with minimum power of 2Watt. The developed system demonstrated the joining of transparent PC and opaque ABS polymers by using 2 dimensional laser beam motion. The air gap could be minimized by using constant force on the upper holding plate, and preheating by the first run of the laser system. The weld bead decreased at the lower laser power and the higher laser scanning speed.

Influence of Process Parameters on the Microstructure, and Geometrical Characteristics of Laser Additive Manufactured (LAM) Titanium Alloy Composite Coatings

2020 ◽  
Author(s):  
O. S. Fatoba ◽  
A. M. Lasisi ◽  
S. A. Akinlabi ◽  
E. T. Akinlabi ◽  
A. A. Adediran
Keyword(s):  
Process Parameters ◽  
Laser Power ◽  
Laser Scanning ◽  
Gas Flow ◽  
Composite Coatings ◽  
Laser System ◽  
Scanning Speed ◽  
Deposition Process ◽  
Beta Phase ◽  
Influence Of Process Parameters

Abstract The study experimentally investigates the effects of Ytterbium Laser System process parameters on the resultant microstructure of Ti-6Al-4V grade 5 alloy and reinforcement powders. The deposition process was conducted employing a 3 kW (CW) Ytterbium Laser System (YLS-2000-TR) machine, coaxial to the reinforcement powder. The laser scanning speed and power were varied between the intervals of 0.8–1.0 m/min and 900–1000 W. All other parameters kept constant were the rate of gas flow, the spot diameter, and the rate of powder flow. Metallurgical studies were conducted where all the samples microstructure was characterized by employing Scanning Electron Microscopy (SEM) and Optical Microscopy (OM). The results showed that a minimum porosity was achieved at high laser power complemented with low powder feed rate. The microstructure formed was dominated by columnar grains and martensitic needle-like structures with a formation of beta phase. It was observed that the microstructure was influenced significantly by the two laser speed modes, and the laser power. The grain size and phase structure were influenced significantly by the laser power; increasing it had resulted in larger grains, and a coarser microstructure. The results also showed that the residual stresses of the optimized specimens were compressive.

Research on Microstructure and Wear Property of 45 Steel Quenched with Different Laser Power

2020 ◽  
Vol 861 ◽  
pp. 35-40
Author(s):  
Yu Liu ◽  
Tian Hao Xu ◽  
Ying Liu ◽  
Hai Cheng Zhang ◽  
Xing Xing Li ◽  
...  
Keyword(s):  
Laser Power ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Wear Volume ◽  
Wear Property ◽  
Steel Matrix ◽  
Wear Properties ◽  
Laser Scanning Speed ◽  
Friction And Wear Properties ◽  
Minimum Wear

The surface of 45 steel is quenched by CO2 laser with scanning speed 1000 mm/min and different laser power 1000W, 1200W, 1400W, 1600W and 1800W. Experiments are carried out to analyze microstructure, friction and wear properties of quenched 45 steel. The results show that the quenching layer thickness increases gradually with the increase of laser power,and the maximum value of quenching layer hardness increases first and then decreases. When the laser power is 1600W, the maximum hardness value is 883HV0.5. But when the laser power is 1800W, the hardness of quenching layer becomes to decrease. The reason is the surface of 45 steel becomes to melt. The wear volume increases first and then decreases too. When laser power is 1600W, the minimum wear volume is 0.08mm3, which is 6.4% to the wear volume of 45 steel matrix without laser quenching. Therefore, better microstructure and properties of 45 steel can be obtained when laser scanning speed is 1000mm/min and laser power is 1600W.

scholarly journals Study of Infrared Laser Parameters on Surface Morphology and Hydrophobic Properties

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3860
Author(s):  
Xia Ye ◽  
Jiang Gu ◽  
Zhenmin Fan ◽  
Xiaohong Yang ◽  
Wei Xu
Keyword(s):  
Laser Power ◽  
Laser Scanning ◽  
Aging Treatment ◽  
Surface Characteristics ◽  
Scanning Speed ◽  
Infrared Laser ◽  
Energy Materials ◽  
Hydrophobic Properties ◽  
Low Surface Energy ◽  
Nano Structures

Many studies have shown that super hydrophobic surfaces have been applied to micro–nano structures and low surface energy materials. In the present study, infrared laser scanning and simple salinization modification were used to improve the hydrophobicity of a surface. When the scanning speed was 100 mm/s, the laser power was 30 W and the scanning interval was 200 μm, the apparent contact angle of surface was up to 157°. The assessment of surface characteristics revealed that decreasing scanning speed or increasing laser power were able to improve the hydrophobicity of the surface. After aging treatment, the superhydrophobic surface prepared by this method still had good durability.

Quality Assessment and Metallurgical Examination of Laser Welded Sheets

2009 ◽  
Vol 83-86 ◽  
pp. 611-615
Author(s):  
Numan Abu-Dheir ◽  
Bekir Sami Yilbas
Keyword(s):  
Laser Welding ◽  
Laser Power ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Careful Examination ◽  
Welding Parameters ◽  
Weld Quality ◽  
Laser Weld ◽  
Power Intensity ◽  
Segregation Profile

Laser welding of steel 316L sheets is considered and the effects of laser welding parameters on the laser weld quality and metallurgical changes in the weld section are presented. The laser weld quality is assessed through careful examination of weld geometrical features, and the resulting weld microstructure. Metallurgical changes in the weld sites are examined using optical, and electron scanning microscope (SEM). Two levels of heat inputs are used-1500W and 2000W; and two scanning speeds of 2cm/s and 4cm/s are used to laser weld 316L sheets. It is found that at the high laser power intensities, evaporation takes place in the irradiated region and as the laser power intensity increases further, a cavity is formed at the top surface of the welding cross section. A similar situation is also observed as the laser scanning speed reduces. The low diffusivity of the alloying elements at high temperatures preserves the segregation profile. The scattered partitioning of the cells and dendrite boundaries are observed due to the presence of Cr and Mo.

scholarly journals IMAGING OF CORROSION PITS ON METALLIC PIPES USING A LASER SCANNER

2011 ◽  
Author(s):  
Homayoun Najjaran
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Scanning Speed ◽  
Displacement Sensor ◽  
Statistical Characteristics ◽  
Measuring Instruments ◽  
Scanning System ◽  
Laser Measurements ◽  
Corrosion Pits ◽  
Pit Depth

This paper describes the hardware and software of a laser scanning system that is used to produce 3D images of external surfaces of pipes. The images are produced in the form of 3D raster images with a resolution of up to 0.1×0.1 mm and an accuracy of 3-10 microns, depending on the desired scanning speed, to portray the corrosion pits on the pipes. The main application of the scanner is to establish patterns for calibrating nondestructive testing techniques (e.g., Remote Field Eddy Current (RFEC) and ultrasound testing that are commonly used to measure the remaining wall thickness of ductile and cast iron pipes), and also identifying the statistical characteristics of the measuring instruments utilized in those methods. The images may also be useful to scrutinize corrosion and failure mechanisms, especially when estimates of average or maximum pit depth are insufficient. The scanning system consists of a 2-DOF robot that can move a laser displacement sensor along a pipe and an instrumented rig that rotates the pipe about its axis. Rotating the pipe and moving the rangefinder along the pipe’s axis, the scanning system acquires laser measurements into a host computer to produce the image. The paper also presents the images and statistical analysis of corrosion pits of pipe samples exhumed and sandblasted for scanning.

A Laser Decontamination Technology for Radioactive Contaminated Metals

2020 ◽  
Author(s):  
Zhao Wan ◽  
Cao Junjie ◽  
Wang Shuai ◽  
Chen Xumin ◽  
Zhang Yongling
Keyword(s):  
Nuclear Power ◽  
Laser Scanning ◽  
Laser System ◽  
Research Result ◽  
Engineering Application ◽  
Scanning Speed ◽  
Decontamination Factor ◽  
Nuclear Facilities ◽  
Laser Scanning Speed ◽  
Deposit Layer

Abstract A large number of radioactive contaminated metals will be produced during the operation and decommissioning of nuclear facilities. Laser ablation is a clean and efficient surface decontamination method for radioactive metals. This study presents experiments to select laser decontamination parameters including laser power, laser pulse width, laser scanning speed and laser focal shift, as well as the construction of a laser decontamination prototype based on a fiber laser system of high power density, which can automatically ablate the radioactive deposit layer, oxide layer and shallow surface layer of metals to get an excellent decontamination result. Depending on this equipment, some engineering application tests were conducted in a nuclear power factory to verify the technology research result and equipment. Decontamination results which evaluate by decontamination factor show that the laser decontamination technology has a good result on the decontamination of radioactive surface contaminated metals.

scholarly journals In Situ Mo(Si,Al)2-Based Composite through Selective Laser Melting of a MoSi2-30 wt.% AlSi10Mg Mixture

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3720 ◽  
Author(s):  
Tatevik Minasyan ◽  
Sofiya Aydinyan ◽  
Ehsan Toyserkani ◽  
Irina Hussainova
Keyword(s):  
High Temperature ◽  
Selective Laser Melting ◽  
Laser Power ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Laser Melting ◽  
Structural Applications ◽  
Laser Scanning Speed ◽  
Fusion Approach

The laser power bed fusion approach has been successfully employed to manufacture Mo(Si,Al)2-based composites through the selective laser melting of a MoSi2-30 wt.% AlSi10Mg mixture for high-temperature structural applications. Composites were manufactured by leveraging the in situ reaction of the components during printing at 150–300 W laser power, 500–1000 mm·s−1 laser scanning speed, and 100–134 J·mm−3 volumetric energy density. Microcomputed tomography scans indicated a negligible induced porosity throughout the specimens. The fully dense Mo(Si1-x,Alx)2-based composites, with hardness exceeding 545 HV1 and low roughness for both the top (horizontal) and side (vertical) surfaces, demonstrated that laser-based additive manufacturing can be exploited to create unique structures containing hexagonal Mo(Si0.67Al0.33)2.

Microstructural Enhancement and Performance of Additive Manufactured Titanium Alloy Grade 5 Composite Coatings

2020 ◽  
Author(s):  
O. S. Fatoba ◽  
S. A. Akinlabi ◽  
E. T. Akinlabi ◽  
L. C. Naidoo ◽  
A. A. Adediran ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Laser Scanning ◽  
Gas Flow ◽  
Composite Coatings ◽  
Laser System ◽  
Scanning Speed ◽  
Deposition Process ◽  
Traverse Speed ◽  
Industrial Applications ◽  
Grade 5

Abstract The surface integrity of Titanium alloy may be improved by surface modification, to expand its availability for more diverse industrial applications. Additive manufacturing is a commercially competitive manufacturing technique with the possibility of altering the entire perception of design and fabrication. The study experimentally investigates the effects that Ytterbium Laser System process parameters, such as laser power, powder feed rate and traverse speed, has on the resultant microstructure of Ti-6Al-4V grade 5 alloy. The deposition process was conducted employing a 3kW (CW) Ytterbium Laser System (YLS-2000-TR) machine, coaxial to the reinforcement powder. The laser scanning speed and power were varied between the intervals of 1–1.2 m/min and 900–1000 W. All other parameters kept constant were the rate of gas flow, the spot diameter, and the rate of powder flow. The microstructure was characterized by grain size and morphology by using Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). During the DLMD process, the thermal histories induced in the process led to the promotion of the transformed α+β microstructure from the initial primary a microstructure; the growth and evolution of the distinct grain morphologies and stability of the alpha and beta structures upon increased and reduced structures. It was ascertained that by increasing the traverse speeds, the cooling rates increased, which resulted in the decrease in the width of the columnar grains.

Design and Realization of Auto-Programming System for SLS on CAD

2013 ◽  
Vol 662 ◽  
pp. 879-883
Author(s):  
Qing Guo Chen ◽  
Jun Cai Zhang
Keyword(s):  
Data Processing ◽  
Laser Power ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Numerical Control ◽  
Orthogonal Experimental Design ◽  
Programming System ◽  
Cross Sectional ◽  
Matching Rule ◽  
Scanning Velocity

The detail and design of numerical control system for SLS are discussed. With the help of Visuall C++ and tool kit ObjectARX in AutoCAD, the data information of the 2D contours are extracted from model in AutoCAD by data processing, and these data are transferred to laser scanning data, finally NC codes for processing are generated. A new kind of adaptive slicing algorithm that determines the slicing thickness by comprehensively considering the surface normal and the cross-sectional area, is adopted in data processing. The preheat temperature, scanning speed, laser power and thickness of spreading layer are main factors to part quality in Selective Laser Sintering(SLS). Sintering parameters are optimized by orthogonal experimental design. And a matching rule between scanning velocity and laser power is established so as to realize the laser power matching in different scanning velocities. In order to maintain and transplanted the system, the modular structure is used in the procedure of system design.

Influence of Process Parameters on the Mechanical Response of Various Layers Processed Using Direct Metal Laser Sintering (DMLS)

2014 ◽  
Author(s):  
S. Ahmed ◽  
H. Doak ◽  
A. Mian ◽  
R. Srinivasan
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Laser Power ◽  
Laser Scanning ◽  
Mechanical Response ◽  
Scanning Speed ◽  
Direct Metal Laser Sintering ◽  
Influence Of Process Parameters ◽  
Microstructural Morphology ◽  
Laser Scanning Speed

During the DMLS process, sintering of the top layer creates melting and heat affected zone in previously sintered layers. In this paper, we will examine the effects of any given process parameter, such as laser power and laser scanning speed, on the mechanical properties and microstructural morphology within the processed layers.

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