Reason for damage: The electric bus was overloaded for a long time, which caused the motor to be overloaded. During the operation, the motor suddenly locked and the shaft and the end cover formed a non-mechanical rotation, causing wear and tear. The electroplated part of the end cover fell off.

Repair requirements: The coaxiality error of the end cover of the bearing chamber does not exceed the diameter of 0.02mm, the cylindricity of the bearing chamber does not exceed 0.006mm, the surface roughness Ra=1.6, and the end chamfer C1. There are no pores, slag inclusions, or lack of fusion after repair.

Process advantages: small dilution, dense structure, good combination of coating and substrate