Synonyms
is a technique of blasting shot onto the surface of an object to change its surface structure.
- A surface treatment technique that aims to improve the appearance of the part.
- Quite similar to sandblasting.
- is done by blasting through small steel balls which are thrown at high speed, continuously.
During a shot-blasting operation, the pressure is high to obtain a large surface roughness.
The operation achieves the preparation levels SA2.5 or SA3.
The effectiveness of abrasive blasting has been proven on different types of parts: in the presence of rust or scale or contaminating agents such as salts, dust, oils, grease, etc…
Other Advantage
Some parts have microscopic cracks (invisible to the naked eye) which cause, in use, leakage defects due to internal pressure. The abrasive blasting closes these cracks by also improving the appearance of the parts. This is an additional guarantee against corrosion.
Abrasive used
For shot blasting, steel shot is used (round & angular high carbon steel shot, round & angular stainless steel shot, etc.)
– Round abrasives sprayed during a shot blasting operation are stripped by friction and inertia. Used in turbine machines, the surface is matted, minimal roughness.
– Angular abrasives : they are crushed and sieved. This operation creates cutting edges which projected at high speed, mechanically unwraps the surface. The crumbling reduces the size of the product but regenerates the edge. The residue turns into dust.
Industrial sectors that use
The oil industry uses shot blasting, particularly for tank bottoms but also for dresses, for the chemical industry, shot blasting is used for tanks and in particular for concrete floors, electrical energy cites also use shot-blasting for tanks and concrete floors, other industries also use shot blasting, such as the automotive industry for engine parts, the aeronautical industry for mechanical parts, the shipbuilding industry for surface cleaning before painting.
Abrasive blasting is the most commonly used term in the abrasive blasting industry, it essentially involves compressed air firing some type of abrasive media at the substrate to be blasted.
The term is commonly substituted with sand blasting too. However sand is a rarely used media now days, as fine silicates generated in the process of sandblasting can pose a health and safety hazard. Sand has been replaced with more advanced types of grit and abrasive media. Common media now include a « grit » of aluminium oxide of various sizes and grades, plastics, and organic media being more commonplace.
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