Not hardfacing or capping the structural welds retaining the overlay plate. This is the primary cause of most CCO failures. It is important to understand joining welds are NOT HARD LIKE THE OVERLAY surface. This means the weld joint does not have the same abrasion resistance as the CCO deposit. The abrasion material flow is now able to get behind the wear plate and create a hole through the equipment structure.
After all welds have secured the wear plate, apply a hardfacing alloy to cover all joining welds. This will protect the joining weld deposit keeping your steel plates in position.
Allowing the edge of CCO to be exposed. NEVER allow the edge of a CCO plate exposed to abrasive elements. The mild steel backing plate for the CCO deposit is not hard and wears away rapidly.
The Chrome Carbide Overlay is there only for wear resistance. This means the overlay has no structural integrity by itself. That is the overlay’s only job. When the softer mild steel base plate has worn away, there is no support for the overlay. Like a violent flood causes a river bank to fail; the carbide surface will tumble into the abrasive flow. This leaves you with zero protection, resulting in another premature failure and unplanned downtime.
For A Successful Installation YOU MUST DO THIS: More critical than the weld joints, ALL exposed CCO plate edges MUST be covered with a compatible hardfacing alloy. Preferably use the same deposit as the overlay; being certain to cover all edges of the CCO wear plate.=
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