Study of the Effect of Shielding Gas on the Plasma Flow of an Electric Arc and on the Droplet of a Molten Metal

Kuznetsov,; Solodsky, S.A.; Kryukov, A. V.; Il’yaschenko, Dmitriy P.; Верхотурова, Е. В.

doi:10.1134/s1063780x21010098

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…It should be such that the pilot arc, which lights up on the power source when the "start" button of the laboratory setup is pressed, quickly switches to the main arc, that is, lights up between the anode and the wire. Studies have shown [34,35] that the optimal distance is 1-4 mm. At a distance of less than 1 mm, contact was observed between the plasma torch nozzle and the wire, which is unacceptable.…”

Section: Resultsmentioning

confidence: 99%

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Determination of Optimal Modes for the Production of Micro Range Metal Powders

Kuznetsov¹,

Il'yashchenko²,

Lavrova³

et al. 2022

Applied Engineering Letters

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This paper presents the results of working out the modes of obtaining micro range powders according to the developed method. It is based on the navigation on the material of the vortex plasma flows of heterogeneous plasma and synchronized high-frequency impact on the electrode. The formation of powders is derived from individual particles heated and accelerated using a high-temperature gas jet -plasma. It is obtained in a special original plasma generator by blowing the plasma-forming inert gas into an electric arc resulting between two electrodes. The possibility of obtaining powders of various sizes and chemical composition by this method on the developed technology has been established. The design of the executive equipment that implements the studied generation process of the micro-size range is best suited for steel wires. Experimental studies made it possible to determine the optimal modes for wires of various chemical composition (steel wire, with a diameter of 1.2 mm, OK Autrod 347Si with a diameter of 0.8 mm). Range of parameters and modes of actuating equipment: current of 70-80A; Plasma-forming gas pressure 0.7-0.8 atm., Wire feed rate 20-40 mm/s, the frequency of ultrasonic oscillations of 50 MHz and 100 MHz. In these conditions, powders are obtained with a dimension of 50-100 μm.

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Section: Resultsmentioning

confidence: 99%

“…Optimum value of the distance from the wire to the Laval nozzle (L, mm) (Fig. 2) was found experimentally [31,34,35]. The dimensions of the resulting particles were chosen as optimization parameters.…”

Section: Resultsmentioning

confidence: 99%

Determination of Optimal Modes for the Production of Micro Range Metal Powders

Kuznetsov¹,

Il'yashchenko²,

Lavrova³

et al. 2022

Applied Engineering Letters

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show abstract

Research progress of low spatter CO2 welding technology

Miao

Dong

et al. 2022

Int J Adv Manuf Technol

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Development of Executive Equipment Design for Implementing the Process of Generating of Drops of Microand Nanoscale Range

Kuznetsov

Il’yaschenko

Kryukov

et al. 2021

Prib. metody izmer.

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Modeling of velocities and temperatures processes distribution in the plasma-forming channel determining the design features and optimal parameters of the plasma torch nozzle is one of promising directions in development of plasma technologies. The aim of this work was to simulate the processes of velocities and temperature distribution in the plasma-forming channel and to determine the design features and optimal geometric parameters of the plasmatron nozzle which ensures the formation of necessary direction of plasma flows for generation of surface waves on the surface of a liquid metal droplet under the influence of the investigated instabilities.One of the main tasks is to consider the process of plasma jet formation and the flow of electric arc plasma. For obtaining small-sized particles one of the main parameters is the plasma flow velocity. It is necessary that the plasma outflow velocity be close to supersonic. An increase of the supersonic speed is possible due to design of the plasmatron nozzle especially the design feature and dimensions of the gas channel in which the plasma is formed. Also the modeling took into account dimensions of the plasma torch nozzle, i. e. the device should provide a supersonic plasma flow with the smallest possible geometric dimensions.As a result models of velocities and temperatures distribution in the plasma-forming channel at the minimum and maximum diameters of the channel were obtained. The design features and optimal geometric parameters of the plasmatron have been determined: the inlet diameter is 3 mm, the outlet diameter is 2 mm.The design of the executive equipment has been developed and designed which implements the investigated process of generating droplets of the micro- and nanoscale range. A plasmatron nozzle was manufactured which forms the necessary directions of plasma flows for the formation of surface waves on the metal droplet surface under the influence of instabilities. An algorithm has been developed for controlling of executive equipment that implements the process of generating drops of micro- and nanoscale range.

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Study of the Effect of Shielding Gas on the Plasma Flow of an Electric Arc and on the Droplet of a Molten Metal

Cited by 3 publications

References 3 publications

Determination of Optimal Modes for the Production of Micro Range Metal Powders

Determination of Optimal Modes for the Production of Micro Range Metal Powders

Research progress of low spatter CO2 welding technology

Development of Executive Equipment Design for Implementing the Process of Generating of Drops of Microand Nanoscale Range

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