Water-jet peening and water-jet shot peening have the common feature of employing a jet of water. There are, however, important differences between the two processes. Water-jet peening has to impose a direct pressure high enough to generate surface plastic deformation. Water-jet shot peening, on the other hand, uses entrained high-velocity shot particles to generate the required surface plastic deformation. Figs.l and 2 illustrate the essential differences between the corresponding impacting streams.
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