CHEMICAL COMPOSITION AND MICROSTRUCTURE OF DEPOSITED METAL WITH FLUXES OBTAINED WITH EMPLOYMENT OF SLAG OF MnO-SiO2-CaO SYSTEM

Abstract

In the works the behavior of the chemical composition and the microstructure of the deposited metal by Submerged Arc Welding (SAW), using fluxes obtained using slags of the MnO-SiO2-CaO system, generated during the welding of  components with this same process is evaluated. A McLean Anderson mixtures experimental design was performed, where the quantities of FeCr, FeMn and Matrix (80 % Slag + 10 % limestone + 10 % Fluorite) in the flux are the variables. With fluxes, obtained by pelletizing with sodium silicate as binder and subsequent calcinations, deposits were performed weld on sheets, making several parallel passes with overlap, and from these samples were extracted for the characterization. The chemical composition and microstructure of the weld were evaluated according to the proportions of the components on the flux mixture. It is conclude that slag recycling to use them as components of a flux for hardfacing by welding is viable and the FeCr and FeMn increasing in the flux leads to a deposited metal suitable for hardfacing of surfaces under wear conditions.