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

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.

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

MATEC Web of Conferences ◽

10.1051/matecconf/202134401007 ◽

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.

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Modeling the hardness of the titanium alloy subjected to laser processing

MATEC Web of Conferences ◽

10.1051/matecconf/202032903020 ◽

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.

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

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.410.456 ◽

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.

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

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.410.482 ◽

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.

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

Journal of Physics Conference Series ◽

10.1088/1742-6596/2131/5/052039 ◽

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.

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A Psychometric Study of the Quality Perception Questionnaire

Swiss Journal of Psychology ◽

10.1024/1421-0185/a000076 ◽

2012 ◽

Vol 71 (2) ◽

pp. 101-106 ◽

Cited By ~ 4

Author(s):

Raffaele Cioffi† ◽

Anna Coluccia ◽

Fabio Ferretti ◽

Francesca Lorini ◽

Aristide Saggino ◽

...

Keyword(s):

Structural Equation ◽

Factor Model ◽

Equation Modeling ◽

Fit Indices ◽

Quality Perception ◽

Italian Survey ◽

Confirmatory Factor ◽

Instrument Measuring ◽

Hospital Structures

The present paper reexamines the psychometric properties of the Quality Perception Questionnaire (QPQ), an Italian survey instrument measuring patients’ perceptions of the quality of a recent hospital admission experience, in a sample of 4400 patients (Mage = 56.42 years; SD = 19.71 years, 48.8% females). The 14-item survey measures four factors: satisfaction with medical doctors, nursing staff, auxiliary staff, and hospital structures. First, we tested two models using a confirmatory factor analysis (structural equation modeling): a four orthogonal factor and a four oblique factor model. The SEM fit indices and the χ² difference suggested the acceptance of the second model. We then did a simulation using a bootstrap with 1000 replications. Results confirmed the four oblique factor solution. Third, we tested whether there were significant differences with respect to age or sex. The multivariate general linear model showed no significant differences in the factors with respect to sex or age.

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Surface layer modification of AlSi6Cu4 aluminium alloy via CO2 laser treatment

International Congress on Applications of Lasers & Electro-Optics ◽

10.2351/1.5060782 ◽

2006 ◽

Cited By ~ 1

Author(s):

K. Bartkowiak ◽

J. Borowski ◽

A. Wołyński ◽

L. Foltynowicz

Keyword(s):

Surface Layer ◽

Aluminium Alloy ◽

Laser Treatment ◽

Co2 Laser ◽

Co2 Laser Treatment

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An Event Quality Scale for Participatory Running Events

Event Management ◽

10.3727/152599518x15403853721358 ◽

2020 ◽

Vol 24 (1) ◽

pp. 139-152 ◽

Cited By ~ 4

Author(s):

John Armbrecht

Keyword(s):

Scale Development ◽

Service Quality ◽

Development Process ◽

Factor Model ◽

Perceived Quality ◽

Social Aspects ◽

Factor Solution ◽

Quality Scale ◽

Cognitive Dimensions

This study focuses on the perceived quality of participatory event experiences by addressing the following question: What are the important aspects of the event experience? The aim of this research is to develop and refine a scale to measure the quality of the event experience for runners at a participatory event. The objective is to combine, apply, test, and refine the existing scales to increase our understanding of the perceived quality of events among amateur running athletes. Both affective and cognitive dimensions are included in the scale. Based on seven dimensions and 36 items, a formal scale development process is adopted. The data consist of 1,923 observations collected during a participatory event with approximately 60,000 registered participants. The seven-factor model, including immersion, surprise, participation, fun, social aspects, hedonic aspects, and service quality, was gradually revised in favor of a four-factor solution: service quality, hedonic aspects, fun, and immersion. As a result, 73.1% of the variance is extracted. This study contributes to a refined scale measuring the perceived event quality of participatory events. Service quality accounts for more than half of the variance extracted. Researchers should continue to develop research on the critical experiential dimensions in an event context. Furthermore, the links between the constructs need attention. The results suggest that event organizers should evaluate their events and event portfolios based on the scale and take actions to increase the perceived quality of these events.

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