The Paton Welding Journal, 2023, №08



2023 №08 (09)

DOI of Article 10.37434/tpwj2023.08.10

2023 №08 (11)

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The Paton Welding Journal, 2023, #8, 73-77 pages

Plasma torch for plasma transferred arc surfacing with two powder feeding systems

O.I. Som

Plasma-Master Co., Ltd., 52 Popudrenko Str., 02094, Kyiv, Ukraine. E-mail: info@plasma-master.com

Abstract
A new design of the PTA torch (PTA torch) for surfacing of nickel, cobalt and iron-based alloys was developed. It combines two systems of powder feeding into the arc: the internal and external one. Such a combination expands the technological capabilities of the PTA torch, and allows surfacing magnetic and nonmagnetic materials. These systems can be used both separately from each other and together for surfacing composite alloys with separate feeding of the matrix and reinforcing powder material. In order to increase the efficiency of powder heating at external feeding into the PTA torch, an auxiliary stabilizing gas flow is used, which allows reducing the powder losses by 10–15 % and improving the deposited bead formation. Optimal flow rates of stabilizing gas are 4‒5 l/min. The PTA torch effectively operates in the current range of 50‒300 А. 8 Ref., 9 Fig
Keywords: plasma transferred arc surfacing, PTA torch design, powder feeding systems, heating efficiency

Received: 28.06.2023
Accepted: 07.08.2023

References

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2. Dilthey, U., Ellermeier. J., Gladkij, P., Pavlenko, A.V. (1993) Kombiniertes Plasma-Pulver-Auftragschweissen. Schweissen und Schneiden, 5, 241-244.
3. Som, A.I. (1999) New plasmatorches for plasma-powder surfacing. Avtomatich. Svarka, 7, 44-48 [in Russian].
4. Som, A.I. (2015) Effect of scheme of powder feeding into arc on its losses and efficiency of plasma-powder surfacing process. The Paton Welding J., 5-6, 22-25. https://doi.org/10.15407/tpwj2015.06.04
5. Som, A.I., Halahuz, B.A. (2020) Plasma transferred arc surfacing of composite alloys with separate feed of tungsten carbides and matrix alloy. The Paton Welding J., 12, 34-39. https://doi.org/10.37434/tpwj2020.12.05
6. Gladky, P.V., Pereplyotchikov, E.F., Ryabtsev, I.A. (2007) Plasma surfacing. Kyiv, Ekotekhnologiya [in Russian].
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8. Stikhin, V.A., Patskevich, I.R. (1967) Determination of thermal characteristics of constricted arc. Svarochn. Proizvodstvo, 9, 26-27 [in Russian]

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