Shot peening is a finish through a cold work process that helps to extend the life of the spring by preventing fatigue and corrosion from stress. The process of shot peening consists of causing compression stress strengthing, by shotting spherical shots onto the wire material causing multiple layers of compression dimples. This process, like fire hardening wood, makes the material more hardened. This hardening of the material makes it more resistant to fatigue, corrosion, cracking and erosion.
