All of the experiment trials were conducted on a
2.2 kW CO2 ByVention 3015 laser cutting
machine provided by Bystronic Inc. The cuts
were performed with a Gaussian distribution
beam mode (TEM00) on 2 mm thick structural
steel S355J2G3 EN 10025 sheet. Chemical
composition for this steel is 0.2% C, 1.5% Mn,
0.5% Si, 0.013% P, 0.007 S. Two straight cuts
each of 60 mm in length were made in each
experimental trial to ascertain surface finish.
The Ra was measured using Surfrest SJ-301
(Mitutoyo) profilometer. Cut off length was 0.8
mm and evaluation length was 4 mm. The
measurements were repeated two times to
obtain averaged values (Table 3).