## 4 Discussion of the Research Results
Prediction of the Stress-Strain State of the Deposited Products, Allowing for the Statistical Data on the Change in Their Geometry  
Analysis of the modes of microplasma deposition of layers of 2.5 mm width revealed that beginning from a certain value of effective power of the microplasma arc, a little higher than the minimal possible value for the start of a stable process, the weld pool volume can increase by 2-3 times without any significant rise in the arc power due to an increase in the amount of the dispersed filler, which is added. As the total heat input into the product is proportional to the weld pool dimensions and deposition efficiency, optimization of the plasma deposition modes by the criteria of the deposited metal weight and energy input may be required. Evaluation of the amount of heat applied to the product allowed for eliminating microcracking in the deposited metal at multilayer deposition of elements of a complex profile at the stage of technology optimization. As a result of the analysis of the statistical data, obtained by the method of measurement of the actual deposited products and the performed modeling of the stress-strain state of the deposited parts, it is possible to select deposition parameters such as rate, microplasma arc current, gas flow rates, filler material flow rate, and arc length. By controlling the microplasmatron movement (trajectory and speed) and pre-selected parameters of the deposition process, it is possible to achieve an improvement in the quality of the deposited product formation. During deposition, it is proposed to maintain a stable arc length using feedback from the system of automatic control of arc voltage (ACAV), which measures the voltage and adjusts the microplasmatron position by height in real-time. Thus, a stable voltage is ensured, which automatically maintains the required arc length. The ACAV system was used as an additional system at the initial stage of investigations, to the extent of the absence of a sufficient volume of statistical data, in cases when it was difficult to predict, with sufficient accuracy, the height of the layers in 3D parts being deposited. Let us consider an example of microplasma powder deposition of a _x_hollow cylinder-part. Modeling of the residual stress-strain state of such a deposited part allowed the determination and minimization of stresses normal to axes X and Y, equivalent stresses, and residual deformations along axis Z due to selection of the heat input (Figure 13). For the calculation of the stress-strain state of the finished part, the respective parameters of the technological mode were selected, and they were used to create the part (Figure 14a). Note that at a certain height of the cylinder building-up, certain instabilities in the deposited bead formation began to appear because of the part overheating. In case of a combination of the results of modeling of the residual stress-strain state of the product with additional analysis of the accumulated statistical data, corrections were made in the additive deposition process, which greatly increased the deposited cylinder height without deterioration of the quality (Figure 14b). Figure 13: _Cont._  
Producing an S-shaped wall is an example of the potential of a corrected process of additive powder microplasma deposition (Figure 15). The HYF-103 powder was used for its manufacturing, and \(N5\) mode from Table 8 was selected as the basic one. For programming each subsequent trajectory of movement of the microplasmatron tool during additive deposition, a combination of the results of modeling the residual stress-strain state of the product with additional analysis of the accumulated statistical data was used. Dynamic stabilization of the arc length was performed via the stabilization of arc voltage using the ACAV system.