Home Forums General Discussion Shot Peening Process, Intensity, Coverage Verification Strips

What is the actual shot peening specification you are working to? If AMS2430 then then J443 would apply. Remember the actual peening specification that is imposed on your purchase order or engineering drawing are boss.

"'Does this mean that if you have enough data that you can test (verify your T1) your machine in the morning only or every 8 hours of operation?"




J443 Revision 2017-08
3.5 Verification of Intensity
3.5.1 When the machine settings are found that yield an intensity within the specified tolerance, a means of process verification and control shall be implemented. Intensity verification arc height readings shall be taken at a frequency determined to be appropriate for assuring consistent peening intensity. The frequency of intensity verifications shall not be longer than eight hours of operation Two schemes for intensity confirmation, one involving a single holder and strip, the other involving multiple holders and strips, are offered in 3.5.1.1 and 3.5.1.2. Note that the practice of intensity confirmation does not constitute an intensity determination since this would require development of a full saturation curve per SAE J443 using a minimum of four strips.


AMS2430 REV U
4.2.1 Acceptance Tests 4.2.1.1 Peening intensity verification (3.5.1 and 3.11.1) is an acceptance test shall be performed at the beginning and, for lot sizes greater than one, at the end of each lot or every eight machine peening hours, whichever is less. Peening intensity verification shall also be performed whenever the in- process media requirements are violated or whenever the size, type, or all of media in the machine is changed. The intensity verification arc height shall be documented in accordance with 4.5. If approved by the cognizant engineering organization, intensity verification intervals may be changed.

"How do other folks go about not verifying your T1 for every part and every location within that part? I'd love to know your thoughts....."
If you have multiple parts that are processed using the exact same process and the same test fixture you should be able to use the data from the first verification across all parts processed for the next 8 hours or end of lot.

If you change the process then a new verification test must be run.