scholarly journals INVESTIGATING THE INFLUENCE OF THE NUMBER OF REPETITIONS AND VOLUMETRIC ENERGY DENSITY ON LASER MARKING OF PRODUCTS

2014 ◽  
Vol 5 (2) ◽  
Author(s):  
Nikolay Angelov
Keyword(s):  
Stainless Steel ◽  
Energy Density ◽  
Fiber Laser ◽  
Power Density ◽  
Experimental Results ◽  
Absorbed Energy ◽  
Laser Marking ◽  
Factors Affecting ◽  
Volumetric Density

The basic factors affecting the laser marking of products – volumetric density of the absorbed energy and the number of repetitions, were studied. Experiments were conducted of marking the samples of stainless steel with fiber laser. The dependence of the contrast of marking from the power density for different number of repetitions, and also the volumetric density of the absorbed energy from speed was obtained and the experimental results analyzed.

scholarly journals Study of contact plates recovery from pharmaceutical cleanroom surfaces across three-time ranges

2020 ◽  
Author(s):  
Tim Sandle
Keyword(s):  
Staphylococcus Aureus ◽  
Stainless Steel ◽  
Environmental Monitoring ◽  
Sampling Method ◽  
Sampling Time ◽  
Experimental Results ◽  
Monitoring Methods ◽  
Microbial Adhesion ◽  
Factors Affecting ◽  
Contact Plate

Viable environmental monitoring methods remain primarily culture based. One example is with the contact plate. While the method is long-established, there remain aspects that are under-researched in relation to sampling. Factors affecting surface recovery relate to microbial adhesion, the type of surface, the sampling method and the time and pressure applied. This paper examines the effect of time, when a consistent pressure is applied, in relation to microbial recovery (for the organism Staphylococcus aureus) from two surfaces common to pharmaceutical facilities: stainless-steel and vinyl. The experimental results show that surface recovery was superior for vinyl compared with stainless-steel. For both surface types, a 20 second sampling time was shown to lead to a better recovery compared to a ten second sampling time (with a 30 second sampling time not leading to a significant improvement to the microbial surface recovery).

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.

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 Interaction between Laser Beam and Plasma/Plume Induced in Welding of Stainless Steel with Ultra-High Power Density Fiber Laser

2007 ◽  
Vol 25 (3) ◽  
pp. 461-467 ◽  
Author(s):  
Yousuke KAWAHITO ◽  
Keisuke KINOSHITA ◽  
Naoyuki MATSUMOTO ◽  
Masami MIZUTANI ◽  
Seiji KATAYAMA
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Fiber Laser ◽  
Power Density ◽  
High Power ◽  
Plasma Plume ◽  
High Power Density

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.

Laser absorption in high-power fiber laser welding of stainless steel and aluminum alloy

2008 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Yousuke Kawahito ◽  
Masami Mizutani ◽  
Seiji Katayama
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Laser Welding ◽  
Laser Absorption
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