The experimental study of the effect of carbon-fluorine containing additives in flux OK 10.71 for 10HSND steel welding has been carried out. The studies have shown, that the additive in the composition of an aluminate-base flux has a positive effect on the weld quality. It has been found out that using carbon-fluorine containing additives in an amount of 4 and 6 % in OK 10.71 flux by 10HSND steel welding the total oxygen content in the weld decreases, but the value of required mechanical properties and the impact viscosity at low temperatures increase, at the expense of reducing the impurity of the weld by oxide nonmetallic inclusions, besides the carbon concentration in the welds remains at the carbon concentration level of base metal.

Experimental study of the effect of the introduction of carbonfl uorine additives containing 14,01 – 22,72 % Al; 13 – 22,04 % F; 13,16 – 21,34 % C; 8,27 – 13,4 % Na; 0,09 – 0,14 % K; 0,66 – 1,09 % Ca; 26,11 – 42,35 % SiO2 ; 1,15 – 1,86 % FeO; 0,07 – 0,12 % MnO; 0,001 – 0,1 % MgO; 1,47 – 2,38 % S; 0,03 – 0,05 % P into oxidative fl uxes AN-348, AN-60, AN-67 when welding of steel 09G2S and aluminate-base OK Flux 10.71 fl ux at welding of steel 10HSND has been carried out. In the experiments it has been shown that from the point of view of the exclusion of formation in the weld of non-metallic inclusions, it is optimal to use carbon as a deoxidizer, as formed with the participation of gaseous carbon compounds (CO and CO2 ) are easily removed and do not contaminate the weld metal with non-metallic inclusions. The studies have shown that the carbon-fl uorine-containing additive in the composition of the fl uxes has a positive effect on the quality of the weld. It has been found out that when using the analyzed additives in the amount of 4 - 6% in the data fl uxes the overall oxygen content in the weld reduces. Fractional gas analysis revealed that the largest number of aluminates and silicates adversely affect the physico- chemical properties of welded joints, contained in the submergedarc welding of AN-60 and OK Flux 10.71, with the introduction of additives the reduction of these compounds has been observed, while in AN-348 and AN-67 fl uxes changes have been insignifi cant. When using the proposed additives the required mechanical properties, as well as impact strength at low temperatures by reducing contamination of the weld with oxide non-metallic inclusions increase, and the concentration of carbon in the weld remains at the level of the base metal.

The influence of a carbon-fluorine additive in AN-348, AN-60, and AN-67 oxidative flux on the welding of 09Γ2C steel and in OK Flux 10.71 basic aluminate flux on the welding of 10XCHД steel is studied experimentally. The composition of the additive is as follows: 14.01–22.72% Al, 13–22.04% F, 13.16–21.34% C, 8.27–13.4% Na, 0.09–0.14% K, 0.66–1.09% Ca, 26.11–42.35% SiO2, 1.15–1.86% FeO, 0.07–0.12% MnO, 0.001–0.1% MgO, 1.47–2.38% S, and 0.03–0.05% P. The experiments show that the use of carbon as the reducing agent is optimal in terms of preventing the formation of nonmetallic inclusions in the weld seam, since its gaseous compounds CO and CO2 are easily captured and do not introduce nonmetallic inclusions in the weld seam. With 4–6% carbon-fluorine additive in the fluxes, the total oxygen content in the seam falls. When using the proposed additive, the mechanical properties and the impact strength at negative temperatures are improved on account of the lower content of nonmetallic inclusions (oxides) in the weld seam. The carbon concentration in the weld seam remains the same as in the basic steel.

Experimental study of the effect of introduction of carbon-fluorine containing additives in AN-67 flux welding of 09G2S steel. It is shown that the use of supplements reduces the total oxygen content in the weld, reduces pollution by oxide non-metallic inclusions and the level of gas saturation of the weld metal, increases required mechanical properties and toughness of the weld. The concentration of carbon in the weld remains at the base metal.

It is shown that the oxygen content of metal of welded joints in automatic submerged arc welding can be reduced by adding additions to the flux. The content of the non-metallic inclusions is reduced, and the mechanical properties and impact toughness of welded joints at sub-zero temperatures increase. The results also show that when adding up to 6% of a carbon-containing addition to the AN-60 flux, the carbon content of the weld metal in welding a low-alloy steel does not exceed the permissible value.