The distinct difference between Shot Peening & Shot blasting - Most of them gets confused the difference between Shot Peening & Shot Blasting
| Shot Blasting | Shot Peening | |
| Definition | Shot blasting or blast cleaning is a process in which an abrasive material is accelerated through a pressurized nozzle or centrifugal wheel and directed at the surface of a part to clean or otherwise prepare the part surface for further treatment. | Shot peening is a cold working process, which uses the mass and velocity of a shot stream to produce residual compressive stress at the surface of the part. It is a precisely controlled process relying on careful selection and control of media,intensity, coverage and equipment. At the time of shot impact, the metal surface yields in tension due to localized stretching that occurs,while the near surface layer is left in a residual compressive state due to the material’s attemptto restore the surface to its original shape |
| Media used | Blasting media includes sand; steel shot; cut wire shot; chilled iron; garnet, a sharp hard abrasive glass beads used to polish rather than remove surface coatings on soft metals and plastics. | Peening media must remain predominately round and uniform in diameter to avoid surface damage upon impact and to maintain a uniform compressive stress layer. |
| Applications | Shot blasting can be used on castings, forgings, and stampings to produce auniform surface texture and for descaling, deburring, and deflashing. Shot blasting is used in a wide variety of industries including automotive, marine, mining, and medical applications. | A variety of different metallic based materials are currently shot peened including: high strength steels,carburized and decarburized steels, cast and austempered ductile iron, and nonferrous alloys of aluminum, titanium and magnesium.Powder metal parts also benefit from shot peening. connecting rods, crankshafts, compression springs, torsion and anti-sway bars and metal implants. |
