Castolin have developed a 'hot' metal spray process specifically for turbocharger shaft repair.

 

In the past shafts were frequently repaired using a cold process in which a surface layer of metal was applied at a temperature below 300'C. The disadvantage of this method is that machined surfaces such as keyways and threads cannot be treated. 'Cold spray' can also detach at the slightest impact.

 

With the Castolin process the sprayed on layer is applied at 1150'C and fused to the parent shaft by further heat application. This method is highly resistant to impact and abrasion and allows full machining of new keyways and threads without any risk of delamination.