Throughout history, the peening process has been used on a vast array of products, from horse shoes to samurai swords. The process originally involved a form of heating, quenching, tempering, and then endless hammering for plastic deformation. In today's peening process, the hammer has largely been replaced with steel and other hard materials being propelled against a substrate using wheel and air technology. This creates a controlled environment to increase fatigue strength and prevent stress corrosion and cracking of metal plates.
The traditional domain of shot peening is in the automotive and aviation industries, but the application of shot peening is now expanding into many new areas which demand higher reliability and durability and lighter-weight parts.