## 2 Materials and Methods
### Experimental Setup  
Experimental studies of CLWD technology were carried out on a laser metal deposition station equipped with a 4 kW HPDL laser unit (Laserline 4000-30). The laser beam was delivered by an optical fiber with a core diameter of 600 \(\upmu\)m to the COAXwire M process head (Coaxworks GmbH, Dresden, Germany), which was characterized by a focal length of collimating and focusing optics of 100 mm and 300 mm, respectively. The optical system of the COAXwire M divides the laser beam into three separate optical paths. The resulting beams are directed at an angle of 20\({}^{\circ}\) to the normal of the substrate material, allowing the coaxial insertion of additional wire material (Figure 4a,b). The power distributions of the laser beam were measured at several planes near the focus using the FocusMonitor device (PRIMES GmbH, Pfungstadt, Germany). The results of the measurements are shown in Figure 4c. Due to the folding of the three laser beams at the processing point, the working distance relative to the position of the laser beam focus was defined as \(\pm\)2 mm. The movement of the processing head was provided by the Reis RV60-40 6-axis robot (Figure 4d). The wire was supplied by the Dinse FD 100 LS-WB wire feeder, providing feeding up to 7 m/min. A constant flow of shielding gas (Ar) was ensured by the Vogtlin GSC-C9 SA gas flow controller. The preheating of the substrate was provided by the high-temperature titanium hot plate PZ 28-3T (PRAZITHERM). The preheating temperature was monitored by a set of thermocouples at different locations in the samples. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Material**} & \multicolumn{8}{c}{**Chemical Composition (\%)**} \\ \cline{2-10}  & **Fe** & **C** & **W** & **Co** & **Cr** & **V** & **Mo** & **Si** & **Mn** \\ \hline BOHLER S390 PM & bal. & 1.62 & 9.98 & 7.47 & 4.91 & 4.35 & 1.85 & 0.43 & 0.29 \\ LAWI 64 & bal. & 1.07 & 4.04 & - & 3.74 & 2.0 & 10.67 & - & - \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Chemical compositions of substrate and wire materials obtained using the EBDS technique. Figure 3: Analysis of the additional wire material: a general view of the microstructure with a magnification on the copper-coated surface layer and EDS analysis results for iron, copper and oxygen. The methodology for developing the additive remanufacturing technology of cutting tool geometry, using the example of a row of teeth in a flat broad, is shown schematically in Figure 5. The deposited structure obtained with the CLWD process had to meet the geometric requirements (height greater than 2.5 mm and width greater than 4 mm), hardness (higher than 700 HV), and quality (no cracks) requirements. The conducted research can be divided into four main stages: the deposition of single clades, the deposition of multiple layers to obtain the appropriate height of the structure, the application of substrate preheating for selected process parameter sets to avoid cracks, and the deposition of geometrical structures that are prefabricated for the grinding process to reproduce the geometry of the cutting tool. In the study, visual evaluation, Vickers (HV1) hardness measurements, and SEM microstructure examination were used for a comparative analysis and final verification of the developed process parameter sets. The experimental plan developed for single clad deposition concerned three process parameters: laser power, travel speed and wire feed rate. The remaining process parameters, i.e., focus position, amount of shielding gas, and free wire length, were kept constant (Table 2). The wire feed rate coefficient (WFRC) that is present in Table 2 is defined as the ratio of wire feed rate to travel speed. The length of the deposited track was 30 mm for the single clad process and 50 mm for multilayer deposition. The number of layers was derived from the geometrical requirements for the remanufactured element and resulted from the particular parameter set.