## 1 Introduction  
Competitive market and the changing needs of customers mean that, ever more frequently, companies are forced to react quickly and modernise their production lines. In order to avoid technological backwardness, manufacturing companies are looking for new technological solutions in the area of product, process and material improvement. Additive manufacturing (AM) technologies are becoming increasingly popular, and this is particularly the case with laser technologies in the automotive, aviation, military and metal industries [1, 2]. The uses of AM technologies allow the production of products of complicated shape, with a relatively low input of energy and material resources and the emission only small amounts of waste. Additive technologies can be classified by the material used (1) the type of substrate structure (2) and the form of energy supply (3). In the case of the third division criterion, one can distinguish between forms of energy supply such as a laser and an electron beam. Additive manufacturing technologies allow the costly replacement of machine and equipment components to be avoided, offering the possibility of repair using, inter alia, laser material deposition (LMD), also referred to as direct energy deposition (DED). Continuous research and progress in the field of process control, have facilitated a significant improvement of AM techniques and a significant improvement in surface roughness and the properties of materials, as well as a reduced variability between layers and the occurrence of discontinuities of embedded materials, thanks to which, manufacturing companies are increasingly deciding to implement AM technology in production. Often laser technologies allow the production parts with complex shape in a number of materials at various scales are of great interest in the areas of prototyping [3; 4]. There are reports, that manufacturing companies use additive methods to regenerate and repair machinery and equipment [5], ex. in the literature were describing reproduction of turbines and blades [6]. For this purpose, powder bed technologies are useful. These can be distinguished, i.e., selective laser melting (SLM) uses fusion in a powder bed for processing metal or selective laser sintering, SLS, consisting of merging polymer powder layers using a laser light beam [7]. The manufacturing industry is currently using AM technology in order to achieve goals related to lightness, increased functionality, a reduction in the number of parts, and a reduction in the assembly stage and also to provide maximum cost reduction and design time [8]. Many laser cladding solutions, in industry, have changed over to serial production in recent years [9]. It is carried out on technologies as well as materials with a specific composition, based, inter alia, on titanium, aluminum, iron, nickel or chromium. The subjects of the technological research are process parameters and the impact of the main elements of the laser coating process on the structure of individual paths, the results of coaxial laser plating, analysis of the impact of the main process parameters, and individual factors on the single track. In the case of research into materials, the modelling approach was examined statistically, in order to forecast selected elements on the processing path, test steel and alloys features, there mechanical properties, the micro-structure, the micro-hardness and the tribological properties of individual cladding paths, analyse the using individual lasers. The influence of the laser on the process and material was also examined, as the relations of the laser power on the shapes of individual paths, the influence of the laser coating process parameters on the geometry and dilution of the alloy, the change in the hardness and the microstructure, etc. [10].