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WELDING TECHNOLOGIES
AND EQUIPMENT
CONCLUSION
1. Investigations were made of
the influence of the thermodynamic
and physicochemical properties of
powder mixtures on the formation
of welds during A-MIG welding of and bulge coefficient (Kh) penetration coefficient (Kp)
stainless steels, which revealed the
dependence of the formation of welds
of stainless steel on thermodynamic
and physicochemical properties of
oxide compounds such as melting
temperature (Tmo), boiling point
(Tbo), temperature range (Tbo - Tmo),
surface tension (σ) and compound enthalpy of formation of oxides (ΔHo 298) mJ / mol
formation enthalpy (ΔHo 298). The
main indicators of the given properties Fig. 9. The dependence of the coefficient of penetration (Кр) and
of oxides that favorably affect the the coefficient of bulge (Kh) on stainless steel CrNi 18-10 from the
qualitative formation of welded joints, enthalpy of formation of oxides (ΔHo 298), used in the form of a gas-
which are as follows: powder mixture during welding A-MIG

(Kh) penetration coefficient (Kp) and bulge coefficient

the oxygen content in the oxide (O2) % of the mass

Fig. 10. The dependence of the coefficient of penetration (Кр) and the coefficient of bulge (Kh) on stainless steel CrNi 18-10
from the oxygen content in the oxide (O2), used in the form of a gas-powder mixture during welding A-MIG.

a) the melting temperature of oxides (Tmo) should be in the range of melting temperatures
(Tmm) and 2000 °C, i.e. the following condition must be met: Tmm <Tmo <2000 °C;
b) the boiling point of the oxides (Tbo) must satisfy the following conditions: Tbm <Tbo
<3000 °C;

Table 3. Physico-chemical properties of the flux SST-13MIG.

Марка
Σ, м Дж/м
о
о
Flux Tm, С Tb, С Tb – Tm, о Σ, m mJ / m2l ΔHо 298, кДж
о
2
ΔH 298,
type kj /mol
флюса
/моль
SST – 1785 2650 865 255 -850
13MIG

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