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.
Experiment investigation on mild steel grade E 350 C using CO2 laser beam machining
Laser beam machining is a predominantly used non-conventional process to cut the desired shape of sheet metal, plate, section and boxes with greater accuracy at least time. A co2 laser beam machine to be cut the mild steel grade E 350 C as thickness(TH) of 12 mm, 16 mm and 20mm. In this research work, a selected input parameters(IP) were laser power(LP), cutting speed(CS), gas pressure(GP), nozzle diameter(ND), focal length(FL), and nozzle distance(NDS). The experiment investigated the effect of this input parameter on output parameters(OP) like kerf width(KW), Perpendicularity(PR), surface roughness(SR), hardness(HRD) and heat-affected zone(HAZ). An experiment to be designed by the Taguchi L27 orthogonal array. After the analyzed result, to get the optimum input parameter for good cutting quality.
The Role of Oxidation in Laser Cutting Stainless and Mild Steel
This paper gives the results of a detailed examination of the particles ejected from the cut zone during CO2 laser cutting of mild and stainless steels. Cuts were carried out over a range of material thickness at the optimum speed for each at a laser power of 900 Watts. Particles ejected from the cut zone were collected and analyzed to establish their chemical and physical characteristics. Analysis techniques included Scanning Electron Microscopy, wet chemical analysis, optical microscopy, metallography and particle sizing. The results from this extensive analysis have enabled the authors to estimate the heat generated by the oxidation process during cutting of both mild and stainless steels.