Shot Peening is a cold-working process specifically engineered to induce compressive residual stresses on the surface of a component. Unlike standard grit blasting, which is used for cleaning or surface preparation, the primary goal of peening is to enhance the fatigue life and stress-corrosion cracking resistance of metal parts subjected to high cyclic loads.

The process involves impacting the surface with spherical media (shot) at a controlled velocity. Each impact acts like a tiny peening hammer, creating a small indentation and stretching the surface fibers.

Technical Control: To be considered a stable engineering process, shot peening must be strictly monitored through:

Intensity: Measured via Almen strips.
Coverage: The percentage of the surface impacted.
Media Quality: Consistency in shape and size to ensure process repeatability.

In a Lean environment, automated shot peening is essential to eliminate the high variance of manual operations, ensuring a stable Cpk and protecting the structural integrity of critical aerospace or automotive components.

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