Geometry distortion, edge oxidation, structural changes and cut surface morphology of 100mm thick sheet product made of aluminum, copper and titanium alloys during reverse polarity plasma cutting
- Authors: Grinenko A.V.1, Chumaevsky A.V.1, Sidorov E.A.1, Utyaganova V.R.1, Amirov A.I.1, Kolubaev E.A.1
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Affiliations:
- Issue: Vol 26, No 4 (2024)
- Pages: 41-56
- Section: TECHNOLOGY
- URL: https://ogarev-online.ru/1994-6309/article/view/292548
- DOI: https://doi.org/10.17212/1994-6309-2024-26.4-41-56
- ID: 292548
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Abstract
The introduction describes the feasibility of using reverse polarity plasma cutting to produce large-sized non-ferrous metal blanks up to 100 mm thick. Data on the use of plasma cutting with direct and reverse polarity currents for thick sheet metal and the main technological problems associated with its implementation are presented. The purpose of the work is to study the organization of the structure and properties of the near-surface zone, changes in the chemical and phase composition when cutting aluminum, copper and titanium alloys. The research methods are optical and scanning electron microscopy, microhardness measurement, X-ray diffraction and energy-dispersive analysis. Plasma cutting was carried out using air as a plasma-forming and shielding gas, simultaneously with water injection into the discharge chamber and the formation of a “water fog” around the plasma column. Results and discussion. It is shown that both the arc stability and the shape of the plasma column are of great importance in reverse polarity plasma cutting of rolled sheets. The distortion of the cutting geometry during normal operation is greatest in the central part, and with insufficient heat input it shifts to the lower part and increases significantly. The operation of the plasma torch in air does not lead to significant changes in the composition of the cutting surface of aluminum and copper alloys. A decrease in the magnesium content near the edge is typical for the aluminum alloy in the surface layers. Cutting of the titanium alloy is accompanied by intense oxidation of the surface, especially in areas of difficult metal displacement from the cutting cavity. The formation of titanium oxides, mainly rutile Ti2O, sharply increases the microhardness values in the surface layers, which negatively affects the machinability of the cutting edge and requires shot blasting to remove the oxide layer. The conclusion describes the main patterns of implementing reverse polarity plasma cutting of sheet metal from aluminum, copper and titanium alloys with a thickness of 100 mm.
About the authors
A. V. Grinenko
Email: giga2011@yandex.ru
ORCID iD: 0009-0002-9511-1303
ITS-Siberia LLC, Krasnoyarsk, 16a Severnoe shosse, 660118, Russian Federation, giga2011@yandex.ru
A. V. Chumaevsky
Email: tch7av@gmail.com
ORCID iD: 0000-0002-1983-4385
Ph.D. (Engineering), Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation, tch7av@gmail.com
E. A. Sidorov
Email: eas@ispms.ru
ORCID iD: 0009-0009-2665-7514
Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation, eas@ispms.ru
V. R. Utyaganova
Email: veronika_ru@ispms.ru
ORCID iD: 0000-0002-2303-8015
Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation, veronika_ru@ispms.ru
A. I. Amirov
Email: amir@ispms.tsc.ru
ORCID iD: 0000-0002-5143-8235
Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation, amir@ispms.tsc.ru
E. A. Kolubaev
Email: eak@ispms.tsc.ru
ORCID iD: 0000-0001-7288-3656
D.Sc. (Engineering), Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation, eak@ispms.tsc.ru
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