scholarly journals Wear of the PG-CP4 coating applied by plasma to 40H13 steel and subjected to laser treatment

2021 ◽  
Vol 2131 (5) ◽  
pp. 052039
Author(s):  
V V Morozov ◽  
V G Gusev ◽  
A V Morozov
Keyword(s):  
Laser Beam ◽  
Laser Processing ◽  
Factor Model ◽  
Radiation Power ◽  
Powder Coating ◽  
Laser Head ◽  
First Case ◽  
Uncoated Steel ◽  
Laser Systems ◽  
The Absolute

Abstract This paper discusses the wear of PG-CP4 powder coating deposited by plasma on 40H13 steel and treated by laser. A multi-factor model was established that relates the absolute wear of the PG-CP4 coating to independent factors of the laser processing process and allows you to reduce the coating wear. The longitudinal feed Spr of the laser beam and distance L from the protective glass of the laser head to the processed surface have the greatest and approximately equal influence on the absolute wear of the coating, and the radiation power W -a minimum influence. The research of 40H13 steel coated (the first option) and uncoated steel (the second option), showed that of all the samples that provide reliable adhesion of the coating to the substrate and the greatest reduction in absolute wear (from 80 to 22 micrometers, by 72.5 %) was achieved in the first case at the mode: W = 3 kW, Spr = 10 mm/s and L = 60 mm. The results of the research are recommended for use in enterprises that implement the processes of plasma and laser processing of materials, as well as in design organizations that develop modern technological laser systems.

Friction Coefficient of the Coating PG-CP4 Sprayed to 40H13 Steel by Plasma and Processed by Laser

2021 ◽  
Vol 410 ◽  
pp. 482-488
Author(s):  
Valentin V. Morozov ◽  
Vladimir G. Gusev ◽  
Aleksey V. Morozov
Keyword(s):  
Friction Coefficient ◽  
Laser Beam ◽  
Laser Treatment ◽  
Plasma Spraying ◽  
Laser Processing ◽  
Factor Model ◽  
Radiation Power ◽  
Laser Head ◽  
Laser Systems

This article deals with laser treatment of plasma spraying of PG-CP4 powder on steel 40H13. A multi-factor model is obtained that relates the friction coefficient of the coating to the radiation power W, the longitudinal feed of the laser beam Spr, and the distance L from the protective glass of the laser head to the sample’s surface. The model allows you to control the modes of laser processing, in order to reduce the friction coefficient of the coating. The greatest influence on the friction coefficient is exerted by the longitudinal feed Spr of the laser beam, followed by the radiation power W and the distance L. A multi-factor model of the friction coefficient of uncoated 40H13 steel treated under the same conditions as coated 40H13 steel is also established. Comparison of the two variants showed that of all the samples providing reliable adhesion of the coating to the substrate, the greatest reduction in the friction coefficient (by 30.2 %) was achieved at W = 5 kW, Spr = 25 mm/s and L = 85 mm. The results of the research are recommended for use in enterprises that implement the processes of plasma and laser processing of materials, as well as in design organizations that develop modern laser systems.

Hardness of the Powder Coating PG-CP4 Applied to Steel 40H13 and Subjected Laser Treatment

2021 ◽  
Vol 410 ◽  
pp. 456-462
Author(s):  
Vladimir G. Gusev ◽  
Valentin V. Morozov ◽  
Dmitry I. Gavrilov
Keyword(s):  
Surface Layer ◽  
Laser Beam ◽  
Laser Treatment ◽  
Protective Coating ◽  
Factor Model ◽  
Radiation Power ◽  
Heat Removal ◽  
Powder Coating ◽  
High Rate ◽  
Laser Head

The article examines the hardness of the coating made of PG-CP4 powder. Plasma powder deposition was performed to samples made of 40H13 steel and then the samples treated with a laser beam. A multi-factor model was established that relates the hardness of the protective coating to the radiation power W, the longitudinal feed Spr of the laser beam, and the distance L from the protective casing of the laser head to the treated surface. Depending on the laser treatment modes, coating was in a state of complete, partial reflow or its absence. Full reflow is characterized by the adhesion of the filler material to the substrate, by maximum hardness of HRC 51.2–56.6 and no defects. In the absence of reflow, gas sinks, transverse microcracks, detachments, and other defects were found in the coating material, and the hardness decreased to HB 125–212. An increase in W and a decrease in Spr lead to increases the hardness of the treated coating, which is explained by an increase in the specific heat flux supplied to the coating per unit time, and a high rate of heat removal deep into the surface layer of 40H13 steel. The thickness of the surface layer with increased hardness ranged from 0.1 to 1.5 mm. Based on the multi-factor model, laser processing modes are controlled to ensure the required values of the protective coating hardness. The research results are recommended for use in enterprises that implement laser technologies and develop modern laser systems.

scholarly journals Wear of the PG-CP4 powder coating applied to HVG steel and subjected to laser treatment

2021 ◽  
Vol 344 ◽  
pp. 01007
Author(s):  
Vladimir Gusev ◽  
Valentin Morozov ◽  
Alexey Morozov ◽  
Dmitry Gavrilov
Keyword(s):  
Laser Beam ◽  
Laser Treatment ◽  
Factor Model ◽  
Radiation Power ◽  
Powder Coating ◽  
Treatment Mode ◽  
Laser Focusing ◽  
Laser Systems ◽  
Process Factors ◽  
Minimum Wear

The article considers the influence of the radiation power W, the longitudinal feed Spr of the laser beam and the distance L from the protective glass of the laser focusing head to the workpiece on the PG-CP4 powder coating absolute wear which was applied to HVG steel by plasma and subjected to laser treatment. A multi-factor model is established that relates the absolute wear of PG-CP4 coating to the input process factors and allows you to assign a laser treatment mode to provide the minimum wear of the processed surface layer. The greatest influence on coating absolute wear is provided by the longitudinal feed of laser beam, with which the wear increases. Compared to Spr, the influence of factor W on the coating absolute wear is 24% less, and the factor L influence is 4.4 times less. The minimum absolute wear of the coating occurs at W = 5 kW, Spr = 40 mm/s, L = 85 mm. The results of the research are recommended for use in enterprises that implement the processes of plasma and laser processing of materials, as well as in design organizations that develop modern technological laser systems.

scholarly journals Pulsed UV Laser Processing of Carbosilane and Silazane Polymers

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 372 ◽  
Author(s):  
Samuel Ligon ◽  
Gurdial Blugan ◽  
Jakob Kuebler
Keyword(s):  
Laser Beam ◽  
Laser Processing ◽  
Scanning Speed ◽  
Inert Atmosphere ◽  
Laser Wavelength ◽  
Uv Laser ◽  
Glass Substrates ◽  
Polymer Precursors ◽  
Laser Systems ◽  
Pre Treatment

Freestanding SiCNO ceramic pieces with sub-mm features were produced by laser crosslinking of carbosilane and silazane polymer precursors followed by pyrolysis in inert atmosphere. Three different pulsed UV laser systems were investigated, and the influence of laser wavelength, operating power and scanning speed were all found to be important. Different photoinitiators were tested for the two lasers operating at 355 nm, while for the 266 nm laser, crosslinking occurred also without photoinitiator. Pre-treatment of glass substrates with fluorinated silanes was found to ease the release of green bodies during solvent development. Polymer crosslinking was observed with all three of the laser systems, as were bubbles, surface charring and in some cases ablation. By focusing the laser beam several millimeters above the surface of the resin, selective polymer crosslinking was observed exclusively.

scholarly journals Modeling the hardness of the titanium alloy subjected to laser processing

2020 ◽  
Vol 329 ◽  
pp. 03020
Author(s):  
Vladimir Gusev ◽  
Valentin Morozov ◽  
Dmitry Gavrilov
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Laser Processing ◽  
Factor Model ◽  
Radiation Power ◽  
Treatment Mode ◽  
Manufacturing Enterprises ◽  
Laser Equipment ◽  
Laser Focusing

The article considers the influence of the radiation power W, the longitudinal feed Spr of the laser beam and the distance L from the protective glass of the laser focusing head to the workpiece on the hardness Hv of the titanium alloy TiTaN. A multi-factor model is established that relates the surface layer hardness to the input factors of laser processing and allows you to quickly assign a laser treatment mode and to control it in order to improve the quality of the processed layer. The power W has the greatest effect on the hardness of the surface layer. With increasing W, the hardness increases. Increasing the feed Spr leads to a decrease in the Hv parameter. The effect of the distance L is similar to the radiation power, but the degree of influence of L is more than half as small as W. The developed method of operational assignment of the laser processing mode allows to reduce the auxiliary time for performing the technological operation. The research results are relevant for manufacturing enterprises that implement laser processing processes, as well as for design organizations that develop modern laser equipment.

scholarly journals Modeling of the PG-CP4 coating hardness applied to H12M steel and subjected to laser treatment

2021 ◽  
Vol 344 ◽  
pp. 01011
Author(s):  
Valentin Morozov ◽  
Vladimir Gusev ◽  
Alexey Morozov ◽  
Dmitry Gavrilov
Keyword(s):  
Surface Layer ◽  
Laser Beam ◽  
Laser Treatment ◽  
Factor Model ◽  
Radiation Power ◽  
Manufacturing Enterprises ◽  
Laser Focusing ◽  
Process Factors ◽  
Coating Hardness

The article considers the influence of the radiation power W, the longitudinal feed Spr of the laser beam and the distance L from the protective glass of the laser focusing head to the workpiece on the PG-CP4 coating hardness which was applied to H12M steel by plasma and then subjected to laser treatment. A multi-factor model is established that relates the PG-CP4 coating hardness to the input process factors and allows you to quickly assign a laser treatment mode and to control it in order to improve the quality of the processed surface layer. Increasing W, Spr and L leads to a increase in the HV parameter. The longitudinal feed Spr of the laser beam has the greatest effect on the surface layer hardness, then followed the distance L and radiation power W. The research results are relevant for manufacturing enterprises that implement laser processing processes of materials and design organizations that develop modern laser equipment.

scholarly journals REDUCING RISK FACTORS IN THE WORKPLACE OF THE LASER SYSTEM OPERATOR

2019 ◽  
Vol 3 ◽  
pp. 184
Author(s):  
Pāvels Narica ◽  
Inese Martinsone
Keyword(s):  
Risk Factors ◽  
Laser Beam ◽  
Thermal Effects ◽  
Laser Processing ◽  
Laser System ◽  
Production Processes ◽  
System Operator ◽  
Laser Systems ◽  
Harmful Substances

Laser processing of materials takes an increasing place in production processes. Improving the performance, improving the quality of processing is not a complete list of the positive aspects of the introduction of laser processing, but there are a number of points that need to be paid attention to during the operation of laser systems - these are issues related to safety. The following risk factors are specific to laser systems: firstly, the laser beam itself, effects on the organs of vision, direct thermal effects on the skin and tissues, secondly, harmful products resulting from the interaction of the laser beam and the material being processed. Aerosols, smoke and dust have different effects on the human body, especially on the respiratory system and the publication considers the risks associated with the release of harmful products during laser processing and the existing methods for reducing the concentration of harmful substances in the working area with specific examples.

Ataxia and Hearing Loss Secondary to Perilymphatic Fistula

PEDIATRICS ◽  
1978 ◽  
Vol 61 (2) ◽  
pp. 238-241
Author(s):  
Gerald B. Healy ◽  
Jules M. Friedman ◽  
Joseph DiTroia
Keyword(s):  
Hearing Loss ◽  
Soft Tissue ◽  
Head Trauma ◽  
Middle Ear ◽  
Vestibular System ◽  
Perilymphatic Fistula ◽  
Labyrinthine Fistula ◽  
First Case ◽  
The Absolute ◽  
Physical Findings

Ataxia is rarely attributed to lesions of the peripheral vestibular system. In 1973, the first case of ataxia and hearing loss secondary to a labyrinthine fistula was reported. Until now, this syndrome has not been reported in patients under the age of 10 years. A case is presented of a 5-year-old boy with symptoms of ataxia and hearing loss as well as vertigo and tinnitus after head trauma. Three physical findings appear to be most characterisitic of patients with perilymphatic fistulas: a positive fistula response, positive positional testing with the involved ear down, and evidence of vestibular ataxia when testing station and gait. The absolute diagnosis of perilymphatic fistula can only be established by exploration of the middle ear space. If a fistula is found, it may be sealed with soft tissue and, if this fails, actual stapedectomy may be required.

scholarly journals Real Time Trajectory Correction System Of Optical Head In Laser Welding

2015 ◽  
Vol 9 (4) ◽  
pp. 265-269 ◽  
Author(s):  
Wojciech Cieszyński ◽  
Michał Zięba ◽  
Jacek Reiner
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Real Time ◽  
Laser Processing ◽  
High Accuracy ◽  
Precise Positioning ◽  
Optical Head ◽  
Welding Technology ◽  
Trajectory Correction ◽  
Correction System

Abstract Application of laser welding technology requires that the laser beam is guided through the whole length of the joint with sufficiently high accuracy. This paper describes result of research on development of optomechatronic system that allows for the precise positioning of the laser head’s TCP point on the edge of welded elements during laser processing. The developed system allows for compensation of workpiece’s fixture inaccuracies, precast distortions and workpiece deformations occurring during the process.

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