Electric motor shafts

[GusD]

We have always used hard-chrome to repair bearing journals on our electric motor shafts.Fifteen or twenty years ago we did experiment with spray welding,results were
disastrous in some cases,reason why we stayed with chrome ,unless the damage was greater han .020" in which case we fabricated a new shaft.
From time to time, the question arises as to why don't we use submerged arc welding or some other form of repair?
The reason we stayed with the chrome process was easy to explain.It was cost competitive and most important very reliable.I would appreciate any information in this matter

Thanks a lot
GusD
GusD

 

[arunmrao]

The disadvantage with any of the weld repair operation is the large heat input to the shaft during the welding operation this affects the microstructure and also distortion in the shaft which will need to be corrected. Also near the weld repair zone we have the heat affected zone where the microstructure of the parent metal will be affected.

Ofcourse now you can have deposition by powder spray or plasma techniques.