We subcontract most of our peening needs and recently received an order of parts from one of our suppliers.
We noticed severe surface irregularities that did not look like a typical shotpeened surface. The material is aluminum, peened to a propietary spec similar to AMS-2430, 8-12A, cast steel shot, 100% coverage. The material, as shown in the pictures, looks almost as though it "flowed" in a certain direction similar to what you would expect if it was melted and resolidified. I am looking for any insight as to what may have caused this. My initial guess is far to great of an intensity in these areas. I also would like to better understand how this could have happened in one area but not on another even though the parts are somewhat symmetrical.
I know that you do not know the shotpeeners exact process, but any guidance would be appreciated.