On-Line Monitoring of the Electric Arc-Spraying Process Based on Acoustic Signatures

1995 ◽  
Vol 209 (5) ◽  
pp. 369-379
Author(s):  
R Kovacevic ◽  
R Mohan ◽  
M Murugesan ◽  
A F Seybert
Keyword(s):  
Stochastic Modelling ◽  
Electric Arc ◽  
Arc Spraying ◽  
Experimental Proof ◽  
Loop Control ◽  
Acoustic Signatures ◽  
On Line ◽  
Taguchi’S Design Of Experiments ◽  
First Time ◽  
Spraying Process

Electric arc spraying (or metal arc spraying) is a process that deposits metal particles on suitable substrates using two consumable wire electrodes. The high-temperature arc formed between these electrodes in an atomizing jet of air produces small molten particles which are used to coat the substrate. The contribution of the process parameters and their interactions on the coating thickness is analysed using Taguchi's design of experiments. The time and frequency domain sound signals generated during the process are utilized to characterize the spraying phenomenon. Stochastic modelling of acoustic signals forms the basis for a closed-loop control mechanism of the arc-spraying process proposed for the first time. Experimental proof of the Gaussian nature of the deposition profile is provided and a mathematical approach has been suggested to obtain a uniform deposit thickness in a single pass.

scholarly journals THE RESEARCH OF PSEUDO COATINGS SPRAYED WITH ELECTRIC ARC SPRAY / PSEUDODANGŲ, UŽPURKŠTŲ ELEKTROLANKINIU BŪDU, TYRIMAS

2017 ◽  
Vol 8 (6) ◽  
pp. 602-608
Author(s):  
Tomas Rodžianskas ◽  
Ovidijus Jarašiūnas ◽  
Irmantas Gedzevičius ◽  
Gediminas Mikalauskas ◽  
Justinas Gargasas ◽  
...  
Keyword(s):  
Power Source ◽  
Electric Arc ◽  
Arc Spraying ◽  
Main Task ◽  
Arc Spray ◽  
Tribological Coatings ◽  
Steel Aisi ◽  
Aisi 316 ◽  
Spraying Process ◽  
Stainless Steel Aisi

The paper presents coatings obtained using two different stainless steel (AISI 316) and marine bronze (CuAl8) wires sprayed with electric arc spraying. Substrate: mild steel S235J2 (LST EN 10025: 2004). Arc spray equipment – “EuTronic Arc Spray 4” with an additional power source. The main task was to select optimal technological spraying process and obtain coatings which possess the best mechanical, physical, tribological properties that meet the requirements of the specific requirements in service coatings. The microhardness, elastic modulus, and morphology was examined. Dry friction wear was assessed in the mass loss of the coatings. The results of tribological coatings properties were assessed in determining the mass lost. Straipsnyje nagrinėjamos elektrolankinio purškimo būdu suformuotos dangos, gautos užpurškus dvi skirtingas pilnavidurės nerūdijančiojo plieno (AISI 316) ir jūrinės bronzos (CuAl8) vielas. Substratas – mažaanglis plienas S235J2 (LST EN 10025:2004). Elektrolankinio purškimo įranga – „EuTronic Arc Spray 4“ su papildomu srovės šaltiniu. Eksperimentų metu siekiama parinkti optimalų technologinį purškimo procesą ir gauti dangas, pasižyminčias geriausiomis mechaninėmis, fizikinėmis, tribologinėmis savybėmis, kurios atitinka konkrečius keliamus reikalavimus eksploatuojamoms dangoms. Nustatytas dangų mikrokietumas, tamprumo modulis ir nagrinėta dangų morfologija. Dangų tribologiniai rezultatai vertinti nustatant prarastąją bandinių masę.

scholarly journals Characterization of spherical stainless steel powders prepared by electric arc spraying process

2020 ◽  
Vol 848 ◽  
pp. 012033
Author(s):  
A A Kirsankin ◽  
T A Kalaida ◽  
M A Kaplan ◽  
M A Smirnov ◽  
A Yu Ivannikov ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electric Arc ◽  
Arc Spraying ◽  
Spraying Process

Modeling Arc Spraying Process for Eccentric Sleeve of Cone Crusher GP 500 Using Computer-Aided Design

2019 ◽  
Vol 970 ◽  
pp. 343-355
Author(s):  
Saulekul Aizhambaeva ◽  
Gulnara Zhetessova ◽  
Tatyana Nikonova ◽  
Galina Vavilova ◽  
Michael Belik
Keyword(s):  
Computer Aided Design ◽  
Electric Arc ◽  
Point Of View ◽  
Arc Spraying ◽  
Main Criterion ◽  
Cone Crusher ◽  
Aided Design ◽  
Spraying Process ◽  
Selection Of ◽  
Strength Of Adhesion

This article deals with studying the technology of electric arc spraying of the eccentric body by selection of the copper-steel pseudo-alloy for spraying a covering. The part durability with the placed covering depends on the technology of spraying and the properties of the sprayed material. By increasing the strength of adhesion of the covering to the base it is possible to establish the optimal indicators of the coating mode. It became the main criterion of studying the arc spraying technology from the mathematical point of view.

scholarly journals Study influence factors of the spraying process on the properties of electric arc spraying coatings

2021 ◽  
Vol 99 (1) ◽  
pp. 74-83
Author(s):  
M. Ageev ◽  
◽  
E. Solovuch ◽  
V. Lopata ◽  
O. Burlachenko ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Service Life ◽  
Flow Rate ◽  
Electric Arc ◽  
Alternative Methods ◽  
Basic Material ◽  
Arc Spraying ◽  
Wire Material ◽  
Spraying Process ◽  
Combustion Mixture

The paper considers possibilities to increase the wear resistance, corrosion resistance, and service life for parts machines and mechanisms via their hardening and renovating using electric arc coatings characterized by high density, adhesion strength, and micro hardness thanks to activation of the spraying process. Also, the possibility of controlling the properties of restored surfaces owing to choice of the related equipment with required structure and characteristics in order to prolong the service life of machinery parts is shown. The right choice of equipment for spraying makes it possible to increase the speed and temperature of the spraying gas and particles, reduce the droplet diameter, increase the density and reduce the oxidation of coatings. The influence of spray factors such as the flow rate and pressure of working gases, composition of combustion mixture, spraying distance, dispersion of the spray, properties of wire material, etc. on the properties of the coatings obtained has been investigated. The possibility of controlling the properties of surfaces owing to choice with required characteristics electric arc coatings is shown. The influence of spray factors such as the flow rate and pressure of working gases, composition of combustion mixture, spraying distance, dispersion of the spray, properties of wire material, etc. on the properties of the coatings obtained has been investigated. The use of coatings makes it possible to increase the wear and corrosion resistance of working surfaces of machine parts and mechanisms, in particular ship parts, and so to reduce the costs of alloyed steels and alloys. The coatings application is associated with implementation of a fundamentally new approach, according to which the strength and carrying capacity of a part is provided by its basic material, whereas the resistance to corrosion, wear, and other factors may be increased via using hardening protective coatings. There are many alternative methods for producing coatings, from which it is advisable to choose an optimal, easy to implement, and inexpensive one. Of the variety of methods for hardening coating deposition, the most common technologies used to restore and improve the performance properties of parts are gas-thermal spraying techniques, among which the cheapest and simplest method is electric arc spraying (EAS), whose current improvement is aimed at modifying and activating the spraying process. Such combined technologies do not require additional expensive equipment and operations, which predetermines a reduction in the cost of hardening processes.

Non-Plasmonic SERS with Silicon: Is It Really Safe? New Insights into Opto-Thermics of Core/Shell Microbeads

2018 ◽  
Author(s):  
Nicolò Bontempi ◽  
Irene Vassalini ◽  
Stefano Danesi ◽  
Matteo Ferroni ◽  
Paolo Colombi ◽  
...  
Keyword(s):  
Critical Role ◽  
Raman Laser ◽  
Core Shell ◽  
Thermal Coupling ◽  
Melting Points ◽  
Experimental Proof ◽  
Weakly Coupled ◽  
Light Management ◽  
Laser Sources ◽  
First Time

<p>Here we investigate for the first time the opto-thermal behavior of SiO<sub>2</sub>/Si core/shell microbeads (Si-rex) irradiated with three common Raman laser sources (lambda=532, 633, 785 nm) under real working conditions. We obtained an experimental proof of the critical role played by bead size and aggregation in heat and light management, demonstrating that in the case of strong opto-thermal coupling the temperature can exceed that of the melting points of both core and shell components. In addition, we also show that weakly coupled beads can be utilized as stable substrates for plasmon-free SERS experiments.</p>

Control Strategies for a Highly Loaded Biological Ammonia Elimination Process

1993 ◽  
Vol 28 (11-12) ◽  
pp. 531-538 ◽  
Author(s):  
B. Teichgräber
Keyword(s):  
Closed Loop ◽  
Control Strategies ◽  
Level Control ◽  
Sludge Dewatering ◽  
Loop Control ◽  
Reject Water ◽  
Line Measurement ◽  
Control Pattern ◽  
On Line ◽  
Treatment Facilities

A nitrification/denitrification process was applied to reject water treatment from sludge dewatering at Bottrop central sludge treatment facilities of the Emschergenossenschaft. On-line monitoring of influent and effluent turbidity, closed loop control of DO and pH, and on-line monitoring of nitrogen compounds were combined to a three level control pattern. Though on-line measurement of substrate and product showed substantial response time it could be used to operate nitrification/denitrification within process boundaries.

Influence of Process Parameters and Geometry of the Spraying Nozzle on the Properties of Titanium Deposits Obtained in Wire Arc Spraying

2015 ◽  
Vol 1111 ◽  
pp. 211-216
Author(s):  
Bogdan Florin Toma ◽  
Iulian Ionita ◽  
Diana Antonia Gheorghiu ◽  
Lucian Eva ◽  
Costică Bejinariu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Process Parameters ◽  
High Speed ◽  
Electrical Current ◽  
Electric Arc ◽  
Arc Spraying ◽  
Oxide Content ◽  
Spray Parameters ◽  
Influence Of Process Parameters ◽  
Wire Arc Spraying

Influence of the process parameters and geometry of the spraying nozzle on the properties of titanium deposits obtained in wire arc spraying. Wire arc spraying is a process in which through minor modifications of the spray parameters, they can have a major impact on the coatings properties. In this paper there is presented a study on the influence of process parameters and fluid dynamics of the atomization gas on the properties of titanium deposits (14T - 99.9% Ti). For this there were used three different frontal spraying nozzles, having different geometries, and were varied the spraying gas pressure and the electrical current on three levels. There were evaluated the particles velocity, coating density, chemical composition and characteristic interface between deposition and substrate. Obviously, the high speed of the atomization gas determinate the improving of all properties, but in the same time increased the oxide content in the layer. However, the oxidation can be drastically reduced if the melting and atomization of the wire droplets is produced at the point of formation of the electric arc, and the spraying jet is designed to constrain the electric arc. The assessment of deposits adherence allowed the observation of process parameters that contribute to its improvement.

Microstructure and Corrosion Resistance of Fe-Based Coatings Prepared by Twin Wires Arc Spraying Process

2013 ◽  
Vol 23 (3) ◽  
pp. 333-339 ◽  
Author(s):  
Jinran Lin ◽  
Zehua Wang ◽  
Pinghua Lin ◽  
Jiangbo Cheng ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Arc Spraying ◽  
Spraying Process
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