CONTROLLED SHOT PEENING
Controlled Shot Peening induces beneficial residual compressive stresses to enhance the performance of metals, protect critical structures and prevent premature failure. It is used extensively by many industries during initial manufacture and it may be necessary during the lifetime of those structures to re-introduce those beneficial residual compressive stresses lost through corrosion, erosion, wear and potentially thermal or stress overload. In these situations it is necessary to re-introduce those beneficial stresses in the same manner as initially applied to ensure identical performance. Sometimes on site it is essential to repeat processing as initially applied via fully mechanised or even robotic processing – all within the capability of Metal Improvement Company.
CONTROLLED SEARCH PEENINGSM
A development from controlled shot peening is Controlled Search PeeningSM. This process searches for sub-surface exfoliation, exposing structures with reduced strength by induces surface compressive stresses. This stretches and yields the outer material and induces visible blistering and flaking at the surface indicating the existence of exfoliation corrosion that is selectively attacking the aluminium substrate via the grain boundaries. Dressing to remove exfoliation and subsequent inspection with search peening again may reveal further fresh areas of exfoliation and/or other visible surface corrosion which will require repeated processing .
It is essential that after any corrosion removal and blending that beneficial compressive stresses are restored to the component by controlled peening.
This process is a highly effective, clean and a quick alternative to controlled shot peening used after blending to restore the beneficial compressive stresses. Components can be treated in situ and no masking is required making it ideal for small areas of repair in critical components reducing maintenance costs and downtime. It is not as effective as controlled shot peening but in specific cases an acceptable alternative.
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