Laser cladding remanufacturing method for mining large gear shaft

The invention discloses a laser cladding remanufacturing method for a mining large gear shaft. Comprising the steps that the to-be-repaired surface of the gear shaft is pretreated, self-melting iron-based alloy powder is prepared, the damaged surface of the gear shaft is scanned, coaxial powder feeding laser cladding is conducted according to a laser cladding scanning path of the to-be-repaired surface, and finish machining aftertreatment is conducted on the repaired damaged surface of the gear shaft. According to the laser cladding remanufacturing method for the mining large gear shaft, a gear shaft repairing coating which is free of cracks and pores, fine in structure, resistant to abrasion and corrosion and excellent in mechanical property can be obtained, and compared with a gear shaft base body, the hardness, the abrasion resistance, the corrosion resistance and the tensile strength of the coating are remarkably improved; local deformation and shape errors of the repaired gear shaft are small, the heat t