Welding robot laser is a monochromatic, directional focused energy beam produced by using stimulated radiation to amplify light, which can obtain a diameter of less than 0.01mm and a power density of up to 10W/㎡. It can be used as a heat source for welding, cutting, and material surface cladding. When laser light waves are incident on materials, the charged particles in the material vibrate according to the rhythm of the light wave electric vector, converting the radiation energy of photons into the kinetic energy of electrons. After absorbing laser, substances first generate excess energy of certain particles, such as the kinetic energy of free electrons, the excitation energy of bound electrons, or excess phonons. These original excitation energies are converted into thermal energy through a certain process. Besides being electromagnetic waves like other light sources, lasers also have characteristics that other light sources do not possess, such as high directionality, high brightness (photon intensity), high monochromaticity, and high coherence. During laser welding processing, the conversion of light energy absorbed by the material into thermal energy is completed in a very short time (about 10 seconds). During this time, thermal energy is limited to the laser radiation area of the material, and then through thermal conduction, heat is transferred from the high temperature area to the low temperature area.