The Paton Welding Journal, 2014, №08



2014 №08 (08)

DOI of Article 10.15407/tpwj2014.08.09

2014 №08 (01)

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The Paton Welding Journal, 2014, #8, 54-57 pages  

WEAR-RESISTANT ARC SURFACING OVER THE LAYER OF ALLOYING CHARGE

V.V. PEREMITKO

Dneprodzerzhinsk State Technical University. 2 Dneprostroevskaya Str., 51918, Dneprodzerzhinsk, Ukraine. E-mail: welding@dstu.dp.ua
 
 
Abstract
Given are the results of study of structure, hardness and relative wear resistance of surface layers of parts, restored by submerged arc surfacing with addition of powdered materials and superposition of external magnetic axial field. Using powders of silicon carbide SiC and aerosil SiO₂ the paste-like mixture on the base of GF-021 primer was prepared and deposited by beads along the surfacing direction. During experiments the composition of mixture, number of layers being deposited, eccentricity in arrangement of layers relative to electrode wire axis, as well as induction of external magnetic field were varied. Coming from the obtained results, the highest values of hardness of the deposited metal were observed at B = 20-50 mT. Optimum pitch in deposition of layers is 4-6 mm. Hardness is growing with increase of number of layers being deposited. Regression equations of mentioned relationships are presented. Due to external magnetic field it became possible to decrease the heat effect on added powdered materials without melting of their particles. Analysis of microstructures proves the effect of magnetic field on crystallization. The uniform distribution of particles of powdered material was occurred, grain number reached 10-12 over 6-8 initial one. Wear tests revealed the least losses in mass of specimens, deposited with addition of SiO₂ particles. In this case the allowable plastic deformation and maximum increase in hardness of surface layers are occurred. 8Ref., 4 Tables, 4 Figures.
 
 
Keywords: submerged arc surfacing, external magnetic field, powders SiC and SiO₂, mixtures on the base of primer, analysis of microstructure, hardness, regression relationships, wear resistance
 
 
Received:                17.03.14
Published:               28.08.14
 
 
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