CO2 laser cutting: Kerf width variation during cutting

2005 ◽  
Vol 219 (8) ◽  
pp. 571-577 ◽  
Author(s):  
I Uslan
Keyword(s):  
Mild Steel ◽  
Product Quality ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Size Variation ◽  
Kerf Width ◽  
Parameter Analysis ◽  
Workpiece Surface ◽  
Power Intensity

The kerf width size variation along a laser-cut section lowers the end product quality significantly. In the present study, CO2 laser cutting of mild steel is considered and the influence of laser power and cutting speed variations on the kerf width size is examined. A lump parameter analysis is introduced when predicting the kerf width size and an experiment is conducted to measure the kerf size and its variation during the cutting process. It is found that the power intensity at the workpiece surface influences significantly the kerf width size. The variation in the power intensity results in considerable variation in the kerf size during the cutting, which is more pronounced at lower intensities.

EXPERIMENTAL EVALUATION OF CO2 LASER CUTTING QUALITY OF UHSS USING OXYGEN AS AN ASSISTED GAS

2016 ◽  
Vol 78 (7) ◽  
Author(s):  
Abdul Fattah Mohamad Tahir ◽  
Ahmad Razelan Rashid
Keyword(s):  
Co2 Laser ◽  
High Strength Steel ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
High Strength ◽  
Gas Pressure ◽  
Kerf Width ◽  
Boron Steel ◽  
Major Factors

Development of new material known as Ultra High Strength Steel (UHSS) able to improve the vehicle mass thus reflecting better fuel consumption. Transformation into high strength steel has been a significant drawback in trimming the UHSS into its final shape thus laser cutting process appeared to be the solution. This study emphasizes the relationship between Carbon Dioxide (CO2) laser cutting input parameters on 22MnB5 boron steel focusing on the kerf width formation and Heat Affected Zone (HAZ). Experimental research with variation of laser power, cutting speed and assisted gas pressure were executed to evaluate the responses. Metrological and metallographic evaluation of the responses were made on the outputs that are the kerf width formation and HAZ.  Positive correlation for power and negative interaction for cutting speed were found as the major factors on formation of the kerf. For the HAZ formation, thicker HAZ were formed as bigger laser power were applied to the material. Cutting speed and gas pressure does not greatly influence the HAZ formation for 22MnB5 boron steel.

Laser Cutting of Thin Aluminum and Silicon Alloy: Influence of Laser Power on Kerf Width

2012 ◽  
Vol 445 ◽  
pp. 442-447 ◽  
Author(s):  
Bekir Sami Yilbas ◽  
S.S. Akhtar ◽  
E. Bayraktar ◽  
Zuhair M. Gasem
Keyword(s):  
Output Power ◽  
Laser Cutting ◽  
Size Variation ◽  
Kerf Width ◽  
Parameter Analysis ◽  
Laser Output ◽  
Laser Output Power ◽  
Thin Aluminum ◽  
Silicon Sheet ◽  
Aluminum Silicon

Laser cutting of aluminum-silicon sheet is carried out. The influence of laser output power on the kerf width is examined in details. The lump parameter analysis is introduced to predict the kerf width size. The percentage of kerf width size variation due to different laser output power levels is formulated. It is found that the kerf width size predicted agrees well with the experimental data. The influence of laser output power on the kerf width size is more pronounced for power levels 350 W. Keywords: laser cutting, aluminum-silicon, kerf width

OPTIMUM EXPERIMENTAL CONDITION IN OXYGEN GAS-ASSISTED LOW POWER Nd:YAG LASER CUTTING

2009 ◽  
Vol 23 (06) ◽  
pp. 877-890 ◽  
Author(s):  
M. BAHAR ◽  
H. GOLNABI
Keyword(s):  
Optimum Condition ◽  
Mild Steel ◽  
Oxygen Pressure ◽  
Nd:Yag Laser ◽  
Laser Power ◽  
Cutting Speed ◽  
Gas Pressure ◽  
Kerf Width ◽  
Oxygen Gas ◽  
Steel Cutting

The optimum condition for the reactive gas-assisted Nd:YAG laser cuttings is described in this article. The cut kerf width is investigated for a laser power range of 50–170 W and a gas pressure of 1–6 bar for steel and mild steel materials. Variation of sample thickness, material type, gas pressure and the laser power on the cut width and slot quality are considered in this study. An overall 338 experiments at different experimental conditions are performed and the kerf results are compared. Optimum conditions for the steel and mild steel materials with a thickness range of 1–2 mm are obtained. The optimum condition for the steel cutting results in a minimum kerf width of 0.2 mm at a laser power of 67 W, cutting speed of 7.1 mm/s and an oxygen pressure of 4 bar. A similar investigation for the mild steel-cutting results in a minimum kerf width of 0.3 mm at the same laser power of 67 W, cutting speed of 9.5 mm/s, and an oxygen pressure of 1 bar. Comparison of the results for the two material types indicates that for cutting mild steel, a lower oxygen gas is required for the optimum condition while the kerf width is a little higher for this case. For the same pressure, workpiece thickness, and cutting speed, the threshold power is lower for the mild steel in comparison with the steel. For the case of steel, it is possible to have a lower kerf width and a better kerf quality.

scholarly journals Analysis of neodymium-doped yttrium-aluminum-garnet laser and experimental prospects for cutting micro-thin black walnut veneers in industry

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 2416-2432
Author(s):  
Bakary S. Doumbia ◽  
Chunmei Yang ◽  
Yan Ma ◽  
Ting Jiang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Process Parameters ◽  
Laser Power ◽  
Laser Cutting ◽  
Yttrium Aluminum Garnet ◽  
Cutting Speed ◽  
Black Walnut ◽  
Kerf Width ◽  
Machining Parameters ◽  
Protection Measures ◽  
Cut Surface

By structurally and practically analyzing the use of Nd: YAG laser for cutting black walnut veneer, this study considered practical and environmental concerns regarding the global warming protection measures. A numerical model of laser wood veneer cutting was based on the relation between process parameters and the material thickness. A pulsed Nd: YAG was used to cut black walnut veneer of 0.3 mm thickness under different machining conditions regarding laser power and cutting speed to study the cut kerf width. An analysis of variance was conducted to test the significance of machining parameters. The parameters studied were laser power, cutting speed, kerf width, cut surface, safety, and eco-friendliness. The results showed that the kerf width decreased significantly with increased cut speed and, inversely, by laser output power. An efficient cut with a narrow kerf, clean and smooth, with less burn, was possible at laser cutting speeds of 2.5, 5.0, and 5.5 mm/s with kerf widths of 0.544, 0.69, 0.62 mm, respectively. As multiple factors affect the micro-thin wood laser cutting process, finding the optimal process parameters is crucial for successful machining with no burn effect.

EXPERIMENTAL STUDY ON THE CO2 LASER CUTTING OF NOVEL POLYAMIDE 6/FLUOROELASTOMER THERMOPLASTIC ELASTOMERIC BLENDS

2015 ◽  
Vol 88 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Shib Shankar Banerjee ◽  
Anil K. Bhowmick
Keyword(s):  
Low Power ◽  
Co2 Laser ◽  
Process Parameters ◽  
Laser Power ◽  
Laser Cutting ◽  
Manufacturing Industry ◽  
Cutting Speed ◽  
Polyamide 6 ◽  
Thermoplastic Elastomers ◽  
Dynamic Vulcanization

ABSTRACT The application of the low-power CO2 laser-cutting process to fluoroelastomer (FKM), polyamide 6 (PA6), PA6/FKM thermoplastic elastomers (TPEs), and their thermoplastic vulcanizate (TPV) is reported. The main laser process parameters studied were laser power, cutting speed, and material thickness. The value of the top and bottom widths of the slit that were formed during laser cutting (kerf width), melted transverse area, and melted volume per unit time were measured and analyzed. Interestingly, TPE showed a smaller melted area and melted volume per unit time when compared with those values with PA6. Dynamic vulcanization further decreased these values. For example, the melted areas of PA6 and TPE were 510 × 10−3 mm2 and 305 × 10−3 mm2, respectively, which reduced to 238 × 10−3 mm2 for TPV at 40 W laser power. FKM showed the lowest value (melted area of 180 × 10−3 mm2). In addition, the output quality of the cut surface was examined by measuring the root mean square (RMS) roughness of the cut edges and heat-affected zone (HAZ). The obtained results indicated that the dimension of the HAZ and RMS roughness largely decreased in TPE when compared with PA6. For example, the HAZ of PA6 was 700 μm, which decreased to 230 μm for TPE at 40 W laser power. On the other hand, HAZ was nonexistent for FKM. Infrared spectroscopic analysis showed that there was no structural change of TPE or pristine polymers after applying the low-power CO2 laser on the surface of materials. CO2 laser cutting will be a new technique in this industry, and this analysis will assist the manufacturing industry to choose a suitable laser system with exhaustive information of process parameters for cutting or machining of rubber, TPEs, and TPVs.

scholarly journals STUDY OF AUXILIARY GAS PRESSURE ON LASER CUTTING TECHNOLOGY

2017 ◽  
Vol 3 ◽  
pp. 163
Author(s):  
Lyubomir Lazov ◽  
Hristina Deneva ◽  
Erika Teirumnieka
Keyword(s):  
Laser Power ◽  
Laser Cutting ◽  
Sheet Steel ◽  
Cutting Speed ◽  
Major Effect ◽  
Gas Pressure ◽  
Experimental Results ◽  
Focus Position ◽  
Angle Deviation ◽  
Basic Parameters

Two types of electrical sheet steel M250-35A and M530-50A were used to cut by melting with a TruLaser 1030 technological system. It was observed that pressure of auxiliary gas had a major effect on kerf width b and cut angle deviation α. Nitrogen as an assisted gas has been taken. The basic parameters as laser power, cutting speed, focus position were constantly supported and the pressure was changed from 4 bar to 20 bar by step 2 bar. As well as the experimental results of gas pressure on entrance and exit kerf widths, have been analyzed and discussed in this study.

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

2021 ◽  
pp. 095440892110627
Author(s):  
Miloš Madić ◽  
Mohamed H Gadallah ◽  
Dušan Petković
Keyword(s):  
Laser Power ◽  
Laser Cutting ◽  
Optimization Problem ◽  
Removal Rate ◽  
Cutting Speed ◽  
Process Efficiency ◽  
Laser Fusion ◽  
Cut Quality ◽  
Dross Formation ◽  
Laser Fusion Cutting

For an efficient use of laser cutting technology, it is of great importance to analyze the impact of process parameters on different performance indicators, such as cut quality criteria, productivity criteria, costs as well as environmental performance criteria (energy and resource efficiency). Having this in mind, this study presents the experimental results of CO2 laser fusion cutting of AISI 304 stainless steel using nitrogen, with the aim of developing a semi-empirical mathematical model for the estimation of process efficiency as an important indicator of the achievable energy transfer efficiency in the cutting process. The model was developed by relating the theoretical power needed to melt the volume per unit time and used laser power, where the change of kerf width was modeled using an empirical power model in terms of laser cutting parameters such as laser power, cutting speed, and focus position. The obtained results indicated the dominant effect of the focus position on the change in process efficiency, followed by the cutting speed and laser power. In addition, in order to maximize process efficiency and simultaneously ensure high cut quality without dross formation, a laser cutting optimization problem with constraints was formulated and solved. Also, a multi-objective optimization problem aimed at simultaneous optimization of process efficiency and material removal rate was formulated and solved, where the determined set of Pareto non-dominated solutions was analyzed by using the entropy method and multi-criteria decision analysis method, that is, the Technique for Order of Preference by Similarity to Ideal Solution. The optimization results revealed that in order to enhance process efficiency and material removal rate, while ensuring high cut quality without dross formation, focusing the laser beam deep into the bulk of material is needed with particular trade-offs between laser power and cutting speed levels at high pressure levels of nitrogen.

Laser Cutting of Thin Aluminum and Silicon Alloy: Influence of Laser Power on Kerf Width

2012 ◽  
Vol 445 ◽  
pp. 442-447 ◽  
Author(s):  
Bekir Sami Yilbas ◽  
S.S. Akhtar ◽  
E. Bayraktar ◽  
Zuhair M. Gasem
Keyword(s):  
Laser Power ◽  
Laser Cutting ◽  
Kerf Width ◽  
Silicon Alloy ◽  
Thin Aluminum

scholarly journals Cutting Properties of Austenitic Stainless Steel by Using Laser Cutting Process without Assist Gas

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Hitoshi Ozaki ◽  
Yosuke Koike ◽  
Hiroshi Kawakami ◽  
Jippei Suzuki
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Molten Metal ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Cutting Process ◽  
Metallic Materials ◽  
Bottom Side ◽  
Gas Nozzle

Recently, laser cutting is used in many industries. Generally, in laser cutting of metallic materials, suitable assist gas and its nozzle are needed to remove the molten metal. However, because of the gas nozzle should be set closer to the surface of a workpiece, existence of the nozzle seems to prevent laser cutting from being used flexible. Therefore, the new cutting process, Assist Gas Free laser cutting or AGF laser cutting, has been developed. In this process, the pressure at the bottom side of a workpiece is reduced by a vacuum pump, and the molten metal can be removed by the air flow caused by the pressure difference between both sides of the specimen. In this study, cutting properties of austenitic stainless steel by using AGF laser cutting with 2 kW CO2 laser were investigated. Laser power and cutting speed were varied in order to study the effect of these parameters on cutting properties. As a result, austenitic stainless steel could be cut with dross-free by AGF laser cutting. When laser power was 2.0 kW, cutting speed could be increased up to 100 mm/s, and kerf width at specimen surface was 0.28 mm.

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