Influence of Plasma Torch Design on Cutting Quality during Precision Air-Plasma Cutting of Metal
| Autor: | N. B. Pugacheva, S. V. Anakhov, Yu. A. Pykin, A. V. Matushkin, B. N. Guzanov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Heat-affected zone
STABILIZATION Materials science EFFICIENCY QUALITATIVE COMPOSITIONS 0211 other engineering and technologies PARAMETER EVALUATION Mechanical engineering HEAT-AFFECTED ZONE OPTICAL INTERFEROMETRY METALLOGRAPHIC ANALYSIS 02 engineering and technology Welding Edge (geometry) WELDING law.invention STRUCTURE TRANSFORMATION DESIGN law GAS DYNAMICS METALLOGRAPHY QUALITY CONTROL PLASMA TORCHES QUALITY PLASMA ARC CUTTING General Materials Science WELDING SEEMS Plasma cutting METAL ANALYSIS 021102 mining & metallurgy SURFACE MICRO-GEOMETRY Torch 020502 materials Metals and Alloys PLASMA TORCH Plasma DEFECTS METAL CUTTING TECHNOLOGICAL FEATURE Plasma arc welding 0205 materials engineering Plasma torch SHEET METAL METALS DYNAMIC STABILIZATION WELDING TECHNOLOGY EFCIENCY SURFACE STRUCTURE |
| Zdroj: | Steel Transl. Steel in Translation Izvestiya Ferrous Metallurgy |
| Popis: | Optical interferometry and metallographic analysis were used to study structure of cutting seams obtained after 09G2S steel cutting by PMVR-5 plasma torch. These plasma torches have a number of design features in the system of gas-dynamic stabilization of plasma arc. It is shown that application of new plasma torch allows obtaining higher quality of cutting 09G2S steel of medium thickness with high productivity and lower energy costs. Metallographic analysis has shown that qualitative composition of the cut surface structure is almost the same, so priority criteria for comparative quality analysis are parameters of surface microgeometry. Evaluation of this parameter shows high quality of cutting almost along the entire length of a cut, since the infuence of technological features of plasma arc cut into the metal affects at a distance of less than 0.3 mm from the edge of the sheet. The use of additional methods of gas-dynamic stabilization in PMVR-5.2 plasma torch (feed symmetry with a double swirl system of plasma-forming gas) allows to achieve additional advantages in terms of surface quality compared to PMVR-5.1. A number of features that affects quality of cut when cutting metals of different thicknesses for welding, is noted depending on the angle of inclination of plasma torch during cutting. Estimates of the surface layer hardness indicate minimal deviations from the requirements of GAZPROM Standard 2-2.4-083 (instructions on welding technologies in the construction and repair of field and main gas pipelines), which allows further use of cutting seams obtained by studied plasma torches for welding without removing zones of thermal influence. Thus, application of new plasma torches makes possible precision finishing plasma cutting of metals, including production of welded joints. © 2020 National University of Science and Technology MISIS. All rights reserved. |
| Databáze: | OpenAIRE |
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