**3. Results and Discussion**

### *3.1. Formulation of Numerical Simulation Parameters*

Figure 5 shows the temperature variation curves of horizontal sample points at different scanning speed, in Figure 5, the temperature in the center of the laser beam is higher than that on both sides. Because the sample points 10 and 11 are distributed symmetrically on both sides of the laser center, the temperature difference is not grea<sup>t</sup> at the same laser power and scanning speed. The laser power is proportional to the temperature of the cladding process and the maximum temperature increases with the increase of the laser power. The scanning speed is inversely proportional to the temperature of the cladding process, and the maximum temperature decreases with the increase of the scanning speed.

**Figure 5.** *Cont*.

**Figure 5.** Maximum temperature variation with power of horizontal sample points at different scanning speed. (**a**) Sample point 10, (**b**) Sample point 6, (**c**) Sample point 11.

The three sample points are located on the matrix. If the maximum temperature of the three points reaches 1300 ◦C, it means that the cladding layer can be completely combined with the matrix. When the laser power is 600 and 800 W, the maximum temperature of the three places is less than 1300 ◦C, which does not meet the requirements; when the laser power is 1000 W, the maximum temperature can reach 1300 ◦C only when the scanning speed at B is 2 and 3 mm/s. When the laser power is 1200 W and 1400 W, the maximum temperature can reach the matrix melting temperature of 1300 ◦C. At this time, only the six schemes corresponding to the laser power of 1200 W and 1400 W meet the requirements.
