Mainly the aircraft industry needs the processes of internal shot peening on various parts. Again many of this parts require a peening treatment inside holes or inside cylinders. Internal . peening is only a small field in the art of peening and blasting. An internal shot peening lance or internal shot deflector must be used under closely controlled conditions.
Internal Shot peening entails impacting a surface with shot (round metallic, glass, or ceramic particles) with force sufficient to create plastic deformation. Internal shot peening is used to strengthen and relieve stress in components like steel automobile crankshafts and connecting rods.