<p>Based on the research results, electroslag welding of 09G2 steel specimens with a thickness of 45 mm using two electrode wires with a diameter of 2.0 mm was performed. The selected welding materials and mode parameters, according to the visual assessment and analysis of current and voltage oscillograms, ensured a stable and smooth welding process without short circuits and arc discharges with the formation of a high-quality welded joint without lack of penetration, slag inclusions, pores, and cracks. Increasing the welding speed by 1.4 times made it possible to reduce the temperature in the heat-affected zone (HAZ) by 300–500°C to the normalizing zone temperature, forming a finegrained structure with high mechanical properties. The microstructure analysis showed the absence of martensite in the weld metal and heat-affected zone. The weld metal grain size ranges from 100 to 200 μm. There are also some areas of ferrite with a grain size of 20 to 70 μm. The grain size of the metal in the HAZ is 20–40 μm. It has been found that when using a combination of Sv08G2SYu+Sv08G2S wires, the hardness of the weld metal is about 230 HV, and the hardness along the HAZ varies from 176 to 250 HV. When using more alloyed Sv10NMA+Sv10KhG2SMA wires, the hardness of the weld metal is 195–208 HV, and along the HAZ, 144–167 HV. The selected electrode wire types provided an improvement in mechanical properties: the ultimate strength and yield strength of the weld metal were improved by 18–22% (to 446 MPa and 645 MPa, respectively), those of the metal in the HAZ by 5–10% (to 340 MPa and 531 MPa, respectively), and the impact strength of the weld metal was increased by a factor of 2.2 (to 17.5 J/cm²).</p>