A practical process for repairing parts – cold welding

During the maintenance and repair process of motors, some key mating surfaces may have dimensional out-of-tolerance problems for some reasons. The most common ones are the negative out-of-tolerance problem in the bearing diameter of the rotating shaft and the positive out-of-tolerance problem in the bearing chamber diameter; in order to prevent When bearing running problems occur, standardized maintenance and repair units will take necessary measures to repair the mating surface tolerances. Among them, cold welding is a repair technology with good application results.

Cold welding is a process that uses mechanical force, molecular force or electricity to spread the welding material to the surface of the appliance. It is often used to repair out-of-tolerance coatings. Depending on the parts to be repaired, different cold welding methods can be used. Among them, overlay welding and thin sheet repair cold welding are mostly used to repair minor defects such as wear, scratches, pores, and blisters on the surface of metal and castings; in the repair of motors The application effect is very good, because after cold welding repair welding, the workpiece will not produce thermal cracks, no deformation, no color difference, no hard spots, high welding strength, and can be machined.

When motor parts adopt general welding processes, due to the high welding temperature, on the one hand it will affect the strength of the material, on the other hand a very important consequence is deformation, especially for thin parts (such as end cover parts). serious. Cold welding is performed at room temperature, and at the same time, the stress of the joint can be relatively evenly distributed on the entire rubber surface, thus improving the welding effect and increasing the fatigue life of the material.

Compared with traditional welding, cold flux has extremely high hardness, adhesion and strength, almost no shrinkage, and can reliably prevent many chemical effects, physical stresses and mechanical stresses.

To sum up, the cold welding technology applied in the motor repair process can be extended to the processing of motor welding parts in a sense, but it must pass the necessary effect verification, and the basic starting point is not to affect the molding effect of the parts.