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WELDING TECHNOLOGIES
AND EQUIPMENT
The dependence graph shows a
high correlation between the enthalpy of
formation of oxides (ΔHo 298) and the
penetration coefficient (Kp) and bulge coefficient (Kh) the results obtained, the best formation
coefficients of penetration (Kp) and bulge
(Kh) of welds (Fig. 9). In accordance with

of the weld surface (Kh) is ensured when
using MIG welding with oxides with an
enthalpy of formation ranging from - 800
kJ / mol to -1000 k J / mol.

In addition, in the framework of this
study, work was carried out to study the
effect of the oxygen content in the oxide
on the formation of welds of the studied
oxide temperature difference (Tbo - Tmo °C)
stainless steel during A-MIG welding.
Studying the effect of oxygen
Fig. 7. The dependence of the coefficient of penetration (Кр) and content in oxides on the morphology
the coefficient of bulge (Kh) on CrNi 18-10 stainless steel from the of welds during A-MIG welding of CrNi
melting temperature of oxides(Tbo - Tmo) used in the form of a 18-10 stainless steel showed a weak
gas-powder mixture in welding A-MIG.
correlation between the oxygen content
in the oxide (O2) and the melt (Kp) and
bulge (Kh) coefficients of the welds (Fig.
10).
As the results showed, the oxygen content in the oxide (O2) affects the value of the
depth of penetration of the joints (P) and the height of the bulge (h), which indicates maximum
penetration of welds with oxygen content in the oxide between 30 and 40 %.
Thus, the results obtained make it possible to establish the requirements for the
physicochemical properties of oxides used as fluxes in MIG welding, at which it is possible to
select the optimal compositions of oxide fluxes for their effective effect on obtaining high-quality
welds.
In accordance with the identified
requirements for the physicochemical
properties of flux-oxides, a new flux
composition of the SST-13MIG grade
was developed in the framework of this
work. Table 3 shows the physicochemical
properties of this flux, determined by
the state diagram of the oxides and
calculation methods. penetration coefficient (Kp) and bulge coefficient (Kh)
Welding tests of the new flux
were carried out during TIG welding of
4.0 mm thick CrNi18-10 stainless steel
plates, which was performed in the
welding modes shown in Table 2.
The photographs of the cross- surface tension of oxides - (σ), mJ / m2
sections of the welds obtained during
traditional MIG welding and A-MIG Fig. 8. Dependence of the melt coefficient (Кр) and the игдпу
welding of stainless steel plates, CrNi18- coefficient (Kh) on stainless steel CrNi 18-10 from the surface tension
10, 4.0 mm thick using the new SST- of oxides (σ), used in the form of a gas-powder mixture during welding
A-MIG
13MIG flux are shown in Fig. 11 and 12.
In accordance with the results of welding tests, welds made using the new SST-13MIG
flux have full penetration throughout the entire thickness of the plate, and compared to welds
obtained without flux welding, their penetration depth increases by 130% (see Fig. 12 and Table
4).

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