Control of the formation of metal structure surface with flux-cored wires

Control of fusion penetration, the fraction of the base metal in the deposited material, as well as the formation and structure of the metal surfaced by the arc method on cylindrical and flat parts with self-shielding flux-cored wires PD-Np-25Kh5FMS 1.8–2.8 mm in diameter, were experimentally studied. The surfacing current has the greatest influence on the fusion penetration and the fraction of the base metal in the deposited material, and the arc voltage affects the stability of the process, the quality of the deposited metal formation, and the presence of defects in it. At the same time, during the arc surfacing of cylindrical parts, the above indicators change with the displacement of the electrode wire (arc) axis from the zenith of the deposited part against the direction of its rotation. It is possible to control the structure of the deposited metal by decreasing the crystallite’s width and increasing its microhardness by changing the deposition modes, which leads to the linear energy decrease. It is possible to increase the productivity of parts surfacing by reducing the number of deposited layers based on the results obtained in this work.