WILA uses the LDM2500-60 semiconductor all-solid-state laser and adopts the synchronous powder feeding iron-based alloy powder method to improve the surface of the high-speed train ER8 wheel by laser cladding to increase its wear resistance and hardness. The orthogonal test selects the relatively superior The process parameters. Using JSM-6360LA scanning electron microscope, Bruker D8ADVANCE X-ray diffractometer, XHV-1000Z digital microhardness tester, M-2000 friction and wear tester, the microstructure and performance of the alloy coating The bonding strength of its interface is tested. The results show that the optimal process parameters are P=1.6k W, v_s=400 mm/min, v_f=25 g/min. The hardness of the coating reaches 444 HV, which is 1.42 times that of the base ER8 steel. Compared with the base material, Its relative wear resistance is as high as 2.1.

(1) Dimension measurement before repair; (2) Mechanical processing and cleaning of damaged parts; (3) Laser cladding repair: The alloy powder for laser cladding is Ni-Cr-Mo or Co-Cr-W alloy powder, laser fused The cladding equipment adopts high-power fiber-coupled semiconductor lasers, with a power of 1800～2500W, a spot diameter of 3～5mm, a cladding speed of 8～15mm/s, and an overlap between tracks of 40%～60%. (4) Finishing and non-destructive inspection after cladding: Lathe and grinder are used to process the parts after cladding to meet the size requirements, and penetrant inspection is used to ensure that the repaired parts are free of cracks and pores. WILA realizes the automation of the laser cladding process, the part deformation during the cladding process is small, there is no pollution, the cost is low, and the service life of such parts is significantly extended.

There is electrical corrosion in the bearing chamber of the end cover of the subway motor. In order to reduce welding distortion, WILA uses laser cladding to repair the bearing chamber of the end cover.

The laser cladding layer on the surface of the high-manganese steel frog manufactured by WILA is made of 431Co40 powder cladding to the top surface of the high-manganese steel frog. The single-layer cladding thickness of the laser cladding layer is 0.5~1.0mm. The thickness of the cladding layer is 5~7mm. The laser cladding layer can be closely combined with the high manganese steel frog matrix, has strong hardness and wear resistance, and can withstand the impact load of train wheels. WILA's surface modification method is easy to operate, suitable for industrial production and promotion, and the product stability after cladding is strong, thereby stepping up the market applicability of ultra-high-speed cladding technology, which can effectively solve the traditional solution strengthening treatment In the early stage of operation, the high-manganese steel frog cannot withstand the impact of high-load trains due to its low hardness.

The high-speed sliding bed platen is an important part of the railway track switch. The platen after laser surface treatment can meet the hardness and anti-corrosion requirements of high-speed railways.

The rotor shaft is the core component of the motor structure. Compared with surfacing, spraying, electroplating and vapor deposition, laser cladding has the advantages of low dilution, dense structure, and good combination of coating and substrate.