FAQ

What is coverage in shot peening?

Q: What is coverage in shot peening?

**Coverage in shot peening is the percentage of the part's surface that has actually been impacted by the shot.** It is one of the two process control variables, together with Almen intensity: intensity indicates the impact energy —and the depth of compression—; coverage, how much of the surface was treated. Full coverage is sought —typically 98% or more, considered “saturation”—, because any un-impacted area lacks the compressive layer and becomes a fatigue weak point. Demanding specifications call for coverage above 100% (for example 200%), meaning twice the time needed to reach saturation. It is verified on the part itself —visual inspection under magnification, or fluorescent tracer coatings that the impacts remove—, following methods such as SAE J2277. Almen intensity and coverage are always specified together; for the full process and how it is controlled, see the introduction to the shot peening process. **As the machine manufacturer, CYM ensures repeatable intensity and coverage results.**

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SHOT PEENING

The variable that ensures the whole surface is treated

Coverage in shot peening is the percentage of the part's surface that has actually been impacted by the shot. It is one of the two process control variables, together with Almen intensity: intensity indicates the impact energy —and the depth of compression—; coverage, how much of the surface was treated.

Full coverage is sought —typically 98% or more, considered “saturation”—, because any un-impacted area lacks the compressive layer and becomes a fatigue weak point. Demanding specifications call for coverage above 100% (for example 200%), meaning twice the time needed to reach saturation.

It is verified on the part itself —visual inspection under magnification, or fluorescent tracer coatings that the impacts remove—, following methods such as SAE J2277.

Almen intensity and coverage are always specified together; for the full process and how it is controlled, see the introduction to the shot peening process.

As the machine manufacturer, CYM ensures repeatable intensity and coverage results.

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