Parametric Study of the Effect of Feed Speed and Power on Laser Cut Quality of 4130 Steel
Samples of 4130 steel were cut by a CO2 laser and the effects of power and feed rate on kerf width, surface roughness, striation frequency and the size of heat affected zone (HAZ) were studied. It was observed that power had a major effect on kerf width and size of HAZ, while feed rate affects were secondary. In the other hand, surface roughness and striation frequency were affected most by feed rate. At low power levels the smallest kerf width and HAZ are obtained and the effect of feed rate is moderate. Low feed rates gave good surface roughness and low striation frequency. For optimum cut quality, kerf width, HAZ and surface roughness are kept minimum. However operating conditions that satisfy these requirements while maintaining high productivity could not be identified.
Laser Parameter Study on Cutting Metal using CO2 Laser

 This experimental study investigated for the effect of laser parameters on machining of the SS41 and SUS304. These materials play an importance role in engineering aspect. They are widely used in high-tech industries such as aerospace, automotive, and semiconductor. Due to the development of technology and high-tech industrialization, the various processing technologies requiring high precision are being developed. However, the conventional cutting process is difficult to meet high precision processing. Therefore, to achieve high precision processing of the SS41 and SUS304, laser manufacturing has been applied. The experiment investigates the process quality of laser cutting for SS41 and SUS304, with the usage of a continuous wave CO2 laser cutting system. The experimental variables are set to the laser cutting speed, laser power, and different used materials. The results are significantly affected by the laser parameters. As the results, the process quality of the laser cutting has been observed by measuring the top and bottom kerf widths, as well as the size of the melting zone and HAZ according to Eline. In addition, the evaluation of the laser processing parameters is significantly important to achieve optimal cutting quality. Therefore, we observed the correlation between the laser parameters and cutting quality. These were evaluated by analysis of variance (ANOVA) and multiple regression analysis.
Theoretical Model Of Reactive Gas Assisted Laser Cutting
Laser cutting has reached a high degree of industrial maturity.Nevertheless to extend the present range of industrial applications, the performance and quality of laser cutting must be improved.Such improvements can only be achieved if the physical mechanism of laser cutting is deeply understood.Special attention has to be payed to dynamic effects, since they are most important for cut quality.Examples for dynamic effects are the formation of periodic striations, that cause a certain roughness or pulsed operation, that allows cutting of parts with changing curvature without overheating/18/. In the following bulk of the paper, a mathematical analysis of reactive gas assisted laser cutting including dynamic effects is presented. Although that work has partly been published before, the present paper contains an important task, that has never been published before, namely the calculation of the reactive energy gain.