The experimental work carried out in this study has confirmed the dependence of the surface finish and kerf geometry on the typical AWJ parameters, and particularly on the feed rate; its influence on the roughness and waviness evidences how, to get a high quality AWJ surface, low levels for the feed rate are required. Nevertheless a too low level could point out a conicity reduction and even divergence, not good for geometrical quality. That means we have a lower limit for feed rate producing parallel kerf walls. The aim of the present work is to find out a functional relationship between the AWJ process parameters and the lower limits for the feed rate.
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