How to Read a Shot Peening Callout
Shot peening is generally performed to either industry specifications, such as those
administered by the Society of Automotive Engineers (SAE), or to customer designed
specifications. The primary components of a shot peening callout include: applicable
specification, area to be peened, and intensity. The selection of the appropriate
media type and intensity is dictated by the part geometry and the material type
and thickness.
Example of a typical shot peening callout:
Shot Peen per SAE J2441 CW-20 Cut Wire Shot,
.010 +/- .002 A arc height, inspect for 100% coverage in accordance with SAE J2277.
In the above callout there are three major components; the specification, the media, and the intensity.
- Shot Peen per SAE J2441 refers to the specification administered
by the Society of Automotive Engineers (SAE) titled Surface Vehicle Standard: Shot
Peening, which describes required peening media, equipment, preparation,
procedure, and quality assurance provisions, among other requirements.
- Inspect for 100% coverage in accordance with SAE J2277 refers to
the specification administered by the SAE titled Surface Vehicle Recommended Practice:
Shot Peening Coverage, which describes the procedure for coverage determination
and inspection methods.
- CW-20 Cut Wire Shot refers to the media type. For a description
of cut wire shot see our
Shot Peening Media page. Media uniformity must be maintained throughout
the entire process and is determined using sampling and sieving procedures.
- .010 +/- .002 A arc height refers to the specified
intensity as expressed in inches on a type A
Almen strip. In this case an intensity of 0.010 inches is desired with an
approved variance of 0.002 inches (the range may be from 0.008 inches to 0.012 inches).
Industrial Metal Finishing, Inc. has extensive experience in creating
and interpreting shot peening specifications. Our engineers are available to assist
you in achieving the optimum results from the shot peening process.