scholarly journals STUDY OF THE INFLUENCE OF DEFOCUSED LASER MARKING PROCESS BY MELTING ON SAMPLES OF STEEL

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Nikolay Angelov
Keyword(s):  
Visual Perception ◽  
Fiber Laser ◽  
Structural Steel ◽  
Laser Marking ◽  
Power Densities

The studies relate to the process of laser marking by melting on the samples of structural steel. The zone of Raleigh for fiber laser was determined. The theoretical dependences of the diameter of the working spot from defocusing and diameter of the radiation falling on the lens were received. Experiments were realized with 50G structural steel. The dependence of contrast of marking from defocusing for two power densities was determined. Working intervals were determined for studied magnitudes for visual perception of the marking.

scholarly journals DETERMINATION OF WORKING INTERVALS OF POWER DENSITY FOR LASER MARKING OF 50ChN STEEL

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Nikolay Angelov
Keyword(s):  
Laser Radiation ◽  
Visual Perception ◽  
Fiber Laser ◽  
Power Density ◽  
Near Infrared ◽  
Laser Marking ◽  
Theoretical Considerations

Studies relate to two basic methods of steel marking − by melting and by evaporation. Based on theoretical considerations, preliminary intervals of power density for laser marking of 50 ChN steel are determined. Experiments are carried out with fiber laser, operating in the near infrared area. Graphics on the dependence of contrast of marking from the power density of laser radiation for two methods of marking were developed. Working intervals of the power density for marking by melting and by evaporation for visual perception of marking and using the readers were defined.

scholarly journals INFLUENCE OF THE OVERLAP COEFFICIENT ON THE CONTRAST IN LASER MARKING OF C110W STEEL

2021 ◽  
Vol 3 ◽  
pp. 15-19
Author(s):  
Nikolay Angelov ◽  
Lybomir Lazov ◽  
Edmunds Teirumnieks
Keyword(s):  
Experimental Data ◽  
Fiber Laser ◽  
Power Density ◽  
Tool Steel ◽  
Laser Marking ◽  
Processing Zone ◽  
Power Densities ◽  
Overlap Coefficient

The laser marking process by melting samples of C110W carbon tool steel was studied. The experiments were performed with a fiber laser and a CuBr laser. A field of squares is marked in a raster method for different values of the overlap coefficient and power density. The contrast of the marking is determined on each marked square. From the obtained experimental data, graphs of the dependence of the contrast on the overlap coefficient for three power densities were drawn. The obtained results for the two lasers are compared and the influence of the wavelength is indirectly analysed. The working intervals of the overlap coefficient for the studied power densities for the two lasers at which the optimal contrast in the processing zone is obtained are determined.

Dissimilar unbeveled butt joints of AA6061 to S235 structural steel by means of standard single beam fiber laser welding-brazing

2021 ◽  
Vol 291 ◽  
pp. 116994
Author(s):  
D. Wallerstein ◽  
F. Lusquiños ◽  
R. Comesaña ◽  
J. del Val ◽  
A. Riveiro ◽  
...  
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Structural Steel ◽  
Fiber Laser Welding ◽  
Butt Joints ◽  
Single Beam

scholarly journals PRELIMINARY NUMERICAL ANALYSIS FOR THE ROLE OF SPEED ONTO LASER TECHNOLOGICAL PROCESSES

2019 ◽  
Vol 3 ◽  
pp. 137
Author(s):  
Lyubomir Lazov ◽  
Nikolay Angelov ◽  
Edmunds Teirumnieks ◽  
Erika Teirumnieka
Keyword(s):  
Laser Pulses ◽  
Temperature Fields ◽  
Laser Source ◽  
Electromagnetic Spectrum ◽  
Preliminary Assessment ◽  
Laser Marking ◽  
Technological Processes ◽  
The Impact ◽  
Power Densities

Studying the impact of speed on a number of laser processes such as marking, engraving, cutting, welding and others is crucial for the optimization of these technological processes. The processing speed, along with the frequency of laser pulses and their duration, also determines the time of action in the processing area and hence the absorbed quantity of electromagnetic energy. Based on numerical experiments with specialized software TEMPERATURFELD3D, the report analyzes the temperature variation in the processing area as a function of speed. The researches were analyzed for processing with two types of lasers emitting in the visible and infrared areas of the electromagnetic spectrum and two types of steels (tool and structural). From the course of the obtained temperature fields the dependence of temperature on the speed at two power densities was obtained. The obtained results help to make a preliminary assessment the speed work intervals for the processes as laser marking, laser engraving, laser cutting, laser welding and others. In this way, it is assisted in building an optimal concept for the passing of a particular technological process in function of the laser source, the material and the type of the technological operation.

NOVEL METHODS TO IMPROVE PULSE ENERGY OF Q-SWITCHED FIBER LASER

2007 ◽  
Vol 21 (08) ◽  
pp. 489-495
Author(s):  
LIANJU SHANG ◽  
JIPING NING ◽  
GUOFANG FAN ◽  
ZHIQIANG CHEN ◽  
QUN HAN ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Pulse Energy ◽  
Fiber Lasers ◽  
Frequency Conversion ◽  
Nonlinear Frequency ◽  
Laser Marking ◽  
Nonlinear Frequency Conversion ◽  
Optical Time Domain Reflectometer ◽  
Range Finding ◽  
Optical Time

Q-switched fiber lasers are very attractive sources in many applications such as in military affairs, surgical operation, laser machining, laser marking, nonlinear frequency conversion, range finding, remote sensing and optical time domain reflectometer. Our goal is to improve the pulse energy of a Q-switched fiber laser. In this paper, certain feasible methods to improve the pulse energy are presented, with their theoretical basis clarified, which may be helpful for the design of kindred Q-switched fiber lasers.

Coloration of Stainless Steel Utilizing Fiber Laser Oxidation

2011 ◽  
Vol 121-126 ◽  
pp. 70-74
Author(s):  
Chin Lung Chang ◽  
Jyun Wei Wu ◽  
Chia Yen Lee
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
Laser Power ◽  
Processing Parameters ◽  
Pulse Frequency ◽  
Optical Microscope ◽  
Laser Marking ◽  
Polished Stainless Steel ◽  
Oxidation Layers ◽  
Stainless Steel 316

This paper presents a novel technique for coloring stainless steel utilizing a fiber laser. This study develops a processing technology that uses a fiber laser as a laser marking tool, and varies processing parameters such as pre-surface-processing conditions, stainless steel type, line distance, laser power, engraving speed, and laser pulse frequencies to achieve different results. This study investigates the results of the stainless workpiece coloring using optical microscope (OM). This study shows that polished stainless steel 316 exhibits the best engraving effect. With this material, the line distance, laser power, engraving speed, and pulse frequency of the laser change the oxidation thickness. The color of the processed workpiece also changes as the oxidation thickness changes due to the interference caused by the different thicknesses of the oxidation layers. Results prove that fiber laser processing of stainless steel is a promising and efficient technique for coloring stainless steel.

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