Influence of introduction of carbon and fluorine additives to fluxes made of silicomarganese slag

Abstract

The authors have carried out the investigations of fluxing agent containing silicomanganese slag with a flux additive based on gas treatment dust of aluminum production. Influence of carbon-fluorine-containing additive introduction on total oxygen and hydrogen content in weld metal has been studied, as well as its influence on impact strength at positive and negative temperatures. For fluxing agent manufacture, silicomanganese slag was used as a base, and aluminum production electrostatic precipitators dust was used as additive. Silicomanganese slag is produced by the West Siberian Electrometallurgical Plant; dust is from aluminum production electrostatic precipitators (carbonfluorine- containing adding) of RUSAL Co. Samples were welded on ASAW-1250 welding tractor. Chemical composition of studied welded samples was investigated according to GOST 10543 – 98 by atomic emission method on DFS-71 spectrometer and by X-ray fluorescence method on XRF-1800 spectrometer. Fractional gas analysis was performed using LECO TS-600 analyzer. Welded samples were tested for impact strength at positive and negative temperatures using impact pendulum-type testing machine according to GOST 9454 – 78. When using a carbon-fluorine-containing flux additive in welding flux based on silicomanganese slag, amount of oxygen and hydrogen in weld metal decreases, while impact strength increases at positive and negative temperatures. Dependences of the amount of oxygen and hydrogen in weld metal and impact strength on the amount of introduced carbonfluorine- containing flux additive were constructed.