激光功率越高，熔覆的金属量越多，多孔的可能性越大。随着激光功率的增加，

The higher the laser power, the greater the amount of cladding metal, and the greater the possibility of being porous. With the increase of laser power, the depth of the cladding layer increases, and the surrounding liquid metal violently waves and dynamically solidifies and crystallizes, thereby gradually reducing or even eliminating the number of pores and reducing cracks. When the depth of the cladding layer reaches the limit depth, as the power increases, the surface temperature of the substrate rises, and the phenomenon of deformation and cracking intensifies. The laser power is too low, only the surface coating melts, and the substrate does not melt. At this time, local pilling, voids, etc. appear on the surface of the cladding layer, which cannot achieve the purpose of surface cladding.

激光功率越高，熔覆的金属量越多，多孔的可能性越大。随着激光功率的增加，熔覆层深度增加，周围液态金属剧烈波并动态凝固结晶，从而逐渐减少甚至消除气孔数量，减少裂纹。当熔覆层深度达到极限深度后，随着功率的增加，基体表面温度升高，变形和开裂的现象加剧，激光功率过低，只有表面涂层熔化，基体不熔化。此时，熔覆层表面出现局部起球、空洞等，无法达到表面熔覆的目的。

The higher the laser power is, the more metal is cladding, and the more porous it is. With the increase of laser power, the depth of cladding layer increases, the violent wave of liquid metal around it solidifies and crystallizes dynamically, which gradually reduces or even eliminates the number of pores and cracks. When the cladding depth reaches the limit depth, with the increase of power, the surface temperature of the substrate increases, and the phenomenon of deformation and cracking intensifies. The laser power is too low, only the surface coating melts, and the substrate does not melt. At this time, local pilling and cavity appear on the surface of cladding layer, which can not achieve the purpose of surface cladding.