The Paton Welding Journal, 2013, №01



2013 №01 (08)

2013 №01 (10)

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The Paton Welding Journal, 2013, #1, 44-46 pages  

EFFECT OF MODE PARAMETERS OF PLASMA SPRAYING USING CURRENT-CARRYING WIRE ON FRACTIONAL COMPOSITION OF SPRAYED PARTICLES

G.M. RUSEV¹, A.G. RUSEV¹, V.V. OVSYANNIKOV¹, O.G. BYKOVSKY² and A.N. PASKO²

¹SPE «Plazmatekh», 4 Gogol Str., Zaporozhie, Ukraine
²Zaporozhie State Technical University of the Ministry of Education and Science of Ukraine, Zaporozhie, Ukraine
 
 
Abstract
A connection was stated between the parameters of mode of plasma spraying using current-carrying wire and fractional composition of sprayed particles, process efficiency and strength characteristics of coating. Plasmatron «Ornitof-5M» was used for spraying of Np65G wire in a water-filled vessel. Collected drops were sifted. Formation of plasma coating mainly of 0.315-0.1 mm fraction size was determined at cathode deepening from 0 up to 1.5 mm, cathode-anode distance from 8 up to 14 mm, 120-220 A welding current, argon consumption of 15-37.5 l/min and 12-22.5 m³/h air consumption. Movement of the sprayed particles in the center and on the periphery of plasma flow is different and main amount of them is transferred by periphery part of the flow. Distance of spraying was changed in the range from 40 up to 150mm, content of the elements in the surface layer at optimum distance 100 mm made 0.4-0.43 % C, 0.7-0.77 % Mn, 0.17% Si and the rest was Fe. Process efficiency makes 0.8-1.1 g/s, coating cohesive strength is 80 MPa at 90-100 mm distance of spraying, hardness makes HB 220-240 and porosity Е 1-2 %. Layer-by-layer removal of smaller and dust-like fractions using high-speed wire brush provides 25-30 % increase of cohesive strength. Optimum mode parameters, i.e. d_e = 1.2-1.6 mm, I_w = 170 A, U_a = 65 V,Q_Ar = 30 l/min, Q_air= 16.5 m³/h, distance of spraying 100 mm with Np65G, PP-100Kh15M2G2R grade wires are used for spraying of wear protection coatings over the parts of power and metallurgical equipment. 2 Ref., 1Table, 2 Figures.
 
 
Keywords: plasma spraying, sprayed particles, current-carrying wire, fractional composition, mode parameters, cohesive strength, efficiency
 
 
Received:                06.09.12
Published:               28.01.12
 
 
References
1. Rusev, G.M., Kyseliov, S.M., Ovsyannikov, V.V. et al. Electric arc plasmatron. Pat. 45253 Ukraine. Int. Cl. 7H05H1/100, 1/24, H05B7/18, B23K10/00. Fil. 10.07.2001. Publ. 15.10.2003.
2. Rusev, G.M., Ovsyannikov, V.V., Kiselyov, S.M. et al. (2000) Technology of restoration and strengthening of surfaces of bodies of rotation and flat surfaces using plasma spraying. The Paton Welding J., 12, 60-61.

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