| Abstrakt: |
Comparative experimental studies have been carried out on the influence of the type and particle size distribution of the original metal granulated materials, which were used as a flux-cored wire charge, on its welding and technological properties during submerged arc surfacing. High-speed steel powder PG-R6M5 with 50-300 µm and 200-250 µm granulation, obtained by spraying of a melt metal, was used as a charge for experimental wires. The standard was flux-cored wire, the charge of which consists of ferroalloys with 50-300 µm granulation, calculated to ensure a similar chemical composition of the deposited metal and manufactured using standard technology. It has been experimentally determined that the welding and technological properties of three types of wires are at a high level, while the surfacing process with flux-cored wires, the charge of which contains granulated powder PG-R6M5, is characterized by greater stability, which results in an increase in melting and surfacing coefficients, and a decrease in the loss coefficient, compared to analogue wire with a charge of ferroalloy powders. It was also determined that the content of harmful impurities in the sample deposited with experimental wires with a charge of granulated powders is lower than in the standard sample. The patterns noted above indicate that the use of granulated powder in a fluxcored wire charge is not only technically feasible, but also leads to an increase in flux-cored wire homogeneity, which has a positive effect on their welding and technological properties. [ABSTRACT FROM AUTHOR] |
