## 1 Introduction
The lateral wire feed method reduces flexibility and increases the difficulty of process control when manufacturing complex parts. It leads to the conclusion that the most effective technology for additive manufacturing or remanufacturing is Coaxial Laser Wire Deposition (CLWD). The wire material is fed precisely and coaxially to the axis of the optical system, which can form the shape of a laser beam using one of two methods: splitting the beam into three separate tracks and then focusing them at a single location under the wire feed nozzle or shaping a laser beam into a ring, splitting it into two half-rings by a prism, and refocusing into an annular shape [16]. On the other hand, as a result of the large angle between the wire and the modified laser beams, the process window for stable wire melting is significantly reduced compared to the lateral wire feed system. The relative position of the laser beam focus relative to the wire tip has a significant impact. In extreme cases, wire dripping or wire stubbing can occur, both of which are considered to be faulty processes [17]. According to [18], in order to achieve a defect-free process, it is necessary to determine the influence of extended process parameters such as wire and travel speed ratio and energy per unit length. The area of applications for the CLWD process includes the deposition of functional coatings (wear protection coatings for iron, cobalt, nickel and copper alloys), remanufacturing (repair of forming tools), and additive manufacturing (fabrication of components made of titanium and nickel alloys) processes [19]. This AM technology is under development, and the results of carrying out the CLWD process for hard-weldable materials from which cutting tools are made have not yet been presented. In the case of HSS processing with a laser beam, the effect of laser surface re-melting on the hardness of HSS was investigated with a 20-30% decrease in the hardness of ASP23 and ASP30 steels observed. Additionally, an improvement in corrosion resistance was observed by the phenomenon of dissociation and refinement of carbides [2]. Some tool steels can be favorable materials for the LMD process because they provide relatively high hardness without cracking. This is a result of the low process-induced residual stressescaused by the favorable coefficient of thermal expansion and the volumetric expansion associated with the formation of solid martensite during cooling [20]. However, there are reports about defects revealed during the LMD of tool steels, such as porosity, cracks and a lack of fusion. The solution to avoid cracking may be to preheat the substrate so that a reduction in thermal stresses is possible [13]. In [21], a preheating temperature of 150 \({}^{\circ}\)C was used in the process of HSS coating deposition, which allowed holding the material at an equilibrium temperature close to the martensite start temperature and resulted in the absence of cracking. Another example of heat treatment after the LMD process of M2 steel on the substrate of AISI 1045 steel was the additional 2 h of tempering at 550 \({}^{\circ}\)C [3]. It is also worth mentioning that during the multilayer deposition of HSS coatings, the phenomenon of tempering of previous clads was observed, but the addition of cobalt in the steel may result in a lesser tempering effect [21]. Moreover, during an extended study of the LMD process of HSS alloys with variable V content, the observed microstructure of the received clads was highly fine-grained compared to conventional casting processes due to the high cooling rates. The shape of VC carbides corresponded with the microhardness of the clad and was highly dependent on the travel speed parameter, while the size of VC carbides influenced the resistance to high-temperature wear phenomena [22]. LMD technology was also used to create a chip-breaking dot on a lathe knife made of W6 Mo5 Cr4V2 steel with the aim of modifying the functionality of the tool edge by shaping the chip and increasing the service life of the tool [23].