## 1 Introduction  
In modern industry, manufacturers are increasingly interested in additive manufacturing. The combination of accuracy and productivity of additive manufacturing is becoming more and more relevant in the production of military equipment parts in field conditions [1], in particular, for the maintenance and repair of armored vehicles at isolated technical maintenance facilities of the tactical level in the conditions of hostilities or for the manufacture of damaged components of other equipment, including small arms [2]. The application of additive technologies allows for saving materials in the fabrication of 3D structures [3]. The ratio of the consumed material weight to the finished part weight for this technology is most often equal to 1:1. When manufacturing a similar part from sheet blanks, this parameter is 4:9 [4]. The mechanical properties of the produced parts are similar [5]. In some capacities, the parts made by additive manufacturing technologies are superior to their analogs produced by traditional methods. Additive welding technologies allow the production of both regular metal and bimetal complex-shaped parts with inner stiffeners. For instance, it was proposed to manufacture, via the WAAM (Wire-Arc Additive Manufacturing) method, bimetal steel-bronze 3D parts, which are rather difficult to produce using the traditional technologies of casting, powder metallurgy, etc. [6]. Another example of a promising application of additive technologies of arc deposition is producing 3D structures from titanium alloys, in particular, complex-shaped panels with stiffeners from Ti-6 Al-4V alloy [4; 7]. One more promising direction of WAAM technology application is the fabrication of large-sized extended 3D structures of a complex shape, for instance, an aircraft wing from a high-strength aluminum alloy [8]. Another promising approach to manufacturing 3D metal products is the application of plasma-arc welding (PAW) technologies. For instance, in ref. [9], additive manufacturing of 3D parts via the PAW deposition of steel shot was proposed. For the cost-effective and energy-efficient additive deposition of small-sized metal products with the general purpose of repairing and/or reconditioning defective dies, molds, and other parts, it is proposed to apply the microplasma deposition process (\(\mu\)-PTA--microplasma-transferred arc) [10]. Herein, it was suggested to use steel wire of 300 \(\mu\)m in diameter from the AISI P20 tool as the filler material, which was deposited at the rate of 42 g/h. Such a process is characterized by the absence of cracks or pores, despite the high hardness of the filler material. The \(\mu\)-PTA process is a less expensive competitor of the known SLM (Selective Laser Melting) process. It was established that this process allows for the production of straight walls with a width of 2.45 mm, an effective width of 2.11 mm, and a deposition efficiency of 87% [11]. The MPTD (microplasma powder deposition) process was developed to create freeform metal parts via SFF (solid freeform fabrication) technology, as well as parts with functionally graded components [12]. With such an approach to the additive deposition of metal parts, the arc length is controlled by monitoring the arc voltage [13]. The application of plasma-arc additive technology for growing 3D parts was proposed by the Honeywell Aerospace Company--the IFF (ion fusion formation) process [14]. The good prospects for the application of additive powder microplasma deposition technology were confirmed by practical results derived at Southern Methodist University (Texas, USA). This method was used to grow 3D products of a cylindrical or other spatial shape [15]. One of the promising features of powder microplasma deposition is the possibility of manufacturing products from hard alloys, in particular those with a high Young's modulus. In ref. [16], a variant of deposition of cobalt-based alloys was developed.