Residual Stress Measurement in Process Control

Author:  Glyn Richards, Proto Manufacturing
Source:  The Shot Peener magazine, Vol 29, Issue 2, Spring 2015
Doc ID:  2015016
Year of Publication:  2015
Abstract:  
From the introduction of John Almen’s shot peening process control tool in the 1930s to the present day, Industry has been faced with a difficult question: How can we know that today’s peened product is truly the same as the first production part and the last part to enter service? The answer we accept is to rely on process control. Almen’s method is used to set up and regularly verify the intensity of the stream of peening media, and a set of parameters (peening time, nozzle and part movements) is independently selected to achieve predetermined coverage on the parts.