At the present time, in the EU countries, in particular Poland, Czech Republic, Slovakia and Germany, a significant increase is observed in production of different metal structures and, respectively, increase in volume of the welding works. At the world market of welding consumables a stable tendency is preserved in the growth of consumption of metal cored wires in various branches of industry [1, 2]. During recent years one of the rapidly developing technologies in manufacture of metal structures is the arc welding using metal cored wire in CO2 or mixtures of argon with CO2 [3, 4]. Metal cored wires of the present assortment do not differ by the technology of application from the solid wires, and by a number of technological characteristics they are even superior [5–7]. First of all, it concerns the stability of arc burning process, transfer of molten electrode metal, characteristics of base metal penetration and formation of weld metal due to the used core composition. Except metal powders, the latter includes, a small amount of mineral components, stabilizing the arc burning and improving the metallurgical characteristics of wire melting and weld metal formation.
In welding with metal cored wire the almost the same technique is used as in welding with a metal cored wire, moreover, it is more convenient and simpler in operation, forms a smooth weld and provides minimum spattering of electrode metal and formation of only traces of slag on the weld surface.
As compared with a solid wire, the metal cored wire provides the higher quality of welds and comparable welding efficiency (92–98 % deposition rate) and at the same time helps to decrease its cost. In addition, in the EU countries the welders are not demanded to pass the additional attestation for fulfillment of MAG process, therefore, they are admitted for work with a metal cored wire at once (standard ISO 9606, part1).
Since 2013 the lines of surfacing and manufacture of oversized
metal structures were put into service. In cooperation with partners a specialized surfacing equipment is designed and