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WELDING TECHNOLOGIES
AND EQUIPMENT
Table 1. The chemical composition of CrNi18-10 steel [according to DIN EN 10088-3].

C Si Mn P S N Cr Ni
≤ 0,07 ≤1,0 ≤2,0 ≤0,045 ≤0,015 ≤0,11 17,0 - 8,0 - 10,5
19,5

morphology of welded joints during MIG flux moves along the auger and is fed into
welding of stainless steel, which are widely the mixing chamber of the mixer 3, where
used in flux compositions for welding stainless it is mixed with the flow of the process gas
steels. (argon, helium, etc.) and in suspension is fed
Gas-powder mixtures were obtained in into the welding zone. Gas is supplied to the
a device for continuous dosed supply of a gas- dispenser at a pressure of 3.68 MPa with an
powder mixture into a welding zone (batcher) argon flow rate of 16 l / min, and the amount
developed by the authors of this work [7]. of flux powder entering the arc zone at a given
A device for the preparation and dosed welding speed (50 cm / min) averages 1.8 g /
supply of gas-powder mixtures is shown in min.
Fig. 1. Automatic MIG and A-MIG welding was
The schematic diagram of a push type carried out on a Romat 310 welding robot with
screw metering unit is shown in Figure 1. The a dispenser installed above the torch in the
required amount of flux is poured into the welding modes shown in Table 2. The following
hopper of the funnel-shaped type 1 feeder. properties were studied as the thermodynamic
At the bottom of the hopper is a screw auger and physicochemical properties of oxides:
2, which is driven by an electric motor with ● melting point (Tmo), C °;
smooth adjustment of the screw speed. Under ● boiling point (Tbo), C °;
the action of the screw, the flux is poured into ● difference in boiling and melting temperatures
the transport channel of the feeder and fills (Tbo - Tmo), °;
the space between the turns of the screw. ● enthalpy of formation (ΔHo298), J / mol;
When the screw rotates, a portion of the ● surface tension (σ), mJ / m2.

model

Fig. 1. Device for the preparation and dosing of gas-powder mixtures:
1 - hopper hopper funnel type, 2 - screw auger,
3 - mixing chamber.

Studies have also been conducted on the effect of the oxygen content in the oxide (O2,
mass %) on the features of the formation of stainless steel welds.
The data on the physicochemical properties of oxides used to study their effect on the
formation of welds of CrNi18-10 stainless steel are borrowed from the well-known database [9]
and information from the reference book [10].
Regarding cobalt (II, III) Co3O4 oxide, we used the property data for cobalt (II) CoO
oxide due to the fact that at a temperature above 900 C ° the reaction 2 Co3O4 = 6 CoO + O2

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