Design, development and study of a technology for manufacturing metal structures using the additive surfacing

The paper proposes a technology of the layer-by-layer additive surfacing of three different workpieces. The resulting workpieces have a complex configuration: cylindrical, truncated spherical, and flat-curved. The workpieces are manufactured using the portal-type CNC machine in combination with the welding inverter. Laser 3D scanning of the workpieces is performed to determine their thickness deviations in the cross sections. The workpieces microstructure and the micro-hardness distribution are determined. The deposited layers unevenness in the workpieces’ cross sections is identified. The obtained samples structure corresponds to the ferrite-pearlite mixture. The paper shows that the grain size increases from the lower layers to the upper ones, and the micro-hardness in the samples’ cross sections decreases from the upper layers to the lower ones. It indicates that preliminary and concomitant heating in the additive surfacing process is required to ensure the structure homogeneity. The study results could be applied in technological processes of the additive surfacing.
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