OXYGEN AS ASSIST GAS
The surface roughness of the end product is a very important indicator of laser cutting quality. The paper reports a comparison of surface roughness during CO2 laser cutting of tungsten alloy plate using oxygen as assist gas, based on control charts made by statistical process control (SPC) approach. Dependent variable is surface roughness, while independent variables are laser power and cutting speed. The control chart used within this paper is a variation of the ichart of experimental data samples, where using evaluation of moving range of the two consecutive values, in order to estimate value of standard error by average moving range and Hartley's constant d2. Applying the criteria often used in the SPC methods for the assessment of "out of control" situations, it may be inferred that the observed differences in surface roughness during CO2 laser cutting could be used to advice on the more appropriate laser power and cutting speed for the laser cutting quality. Keyword: laser cutting process; statistical process control; control chart; surface roughness; tungsten alloy This Publication has to be referred as: Begic-Hajdarevic, D[erzija]; Pasic, M[ugdim]; Vucijak, B[ranko] & Cekic, A[hmet] (2016). Statistical Process Control of Surface Roughness during CO2 Laser Cutting using Oxygen as Assist Gas, Proceedings of the 26th DAAAM International Symposium, pp.0247-0255, B. Katalinic (Ed.), Published by DAAAM International, ISBN 978-3-902734-07-5, ISSN 1726-9679, Vienna, Austria DOI:10.2507/26th.daaam.proceedings.034