Burnard
Automotive
- Oct 24, 2003
- 1
Hello!
I'm having an issue with the induction hardening of a bearing journal - on certain parts 2 distinct thin tracks of 'spatter' are visible on the journal. It looks as if the coil has contacted the journal there or come so close that the current has 'arced'and burnt the journal material. The vast majority of the surface is good, hardened correctly and unburnt.
In our analysis we have noticed that certain parts in the soft condition have light scratches on the journal (handling damage) in the area where the hardening problem occurs.
I believe that the two are related. Does this make sense? Do scratches or surface defects act as 'current intensifiers' to cause this kind of very localised overheating / burning? Is there someone with more experience of induction hardening out there who can help!?
Many thanks in advance for any help, advice or clues!
Mark
I'm having an issue with the induction hardening of a bearing journal - on certain parts 2 distinct thin tracks of 'spatter' are visible on the journal. It looks as if the coil has contacted the journal there or come so close that the current has 'arced'and burnt the journal material. The vast majority of the surface is good, hardened correctly and unburnt.
In our analysis we have noticed that certain parts in the soft condition have light scratches on the journal (handling damage) in the area where the hardening problem occurs.
I believe that the two are related. Does this make sense? Do scratches or surface defects act as 'current intensifiers' to cause this kind of very localised overheating / burning? Is there someone with more experience of induction hardening out there who can help!?
Many thanks in advance for any help, advice or clues!
Mark
