To realize a high precision cutting operation, we must know the position and pointing of the beam axis- which are defined in accordance with ISO, by the centers of gravity of energy density distributions at different distances from the exit lens of laser.
The angle of focalization must be related at least with; material width, beam energy, cutting speed, precision requirements and workpiece destination.
Authors have realized experimental set-up for simultaneous measurement of energy density distributions, correlated with the mentioned working parameters.
Besides the geometrical details, the authors studied also the influence of different values of beam density, about the zone affected by heat (h.a.z.) This is very important, particularly for the workpieces which could be used in some engines where they are exposed at important stress, vibrations a.s.o.
The ideal cutting process requires parallel walls at the entrance of the beam and the same on the exit. To realize such operations, we have to fix the focalization angle for each material, for each dimension and provide the correct cutting speed and the complete evacuation of the melted material.
The study may be extended also to other materials like advanced metal matrix composites, amorphous metals for aerospace applications and others.