A comparative study on fusion cutting with disk and CO2 lasers

Scintilla, Leonardo Daniele; Tricarico, Luigi; Mahrle, Achim; Wetzig, Andreas; Himmer, Thomas; Beyer, Eckhard

doi:10.2351/1.5062033

Cited by 23 publications

(10 citation statements)

References 5 publications

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“…Therefore for a given sheet thickness the effective intensity of a CO2 laser beam on the surface of the cut front can be higher than the intensity of a fiber laser beam, even in the case of greater focus radii of the CO2 laser beam [3]. Characteristic defects of the cut-edge in laser cutting are dross, valleys and picks, macro-irregularities, striations and inclination of the kerf section [4]. Among these defects the striation pattern can be considered the most characterizing difference between the two laser cutting technologies.…”

Section: Introductionmentioning

confidence: 98%

On the use of Areal Roughness Parameters to Assess Surface Quality in Laser Cutting of Stainless Steel with CO2 and Fiber Sources

et al. 2015

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Laser cutting provides various advantages such as high flexibility in terms of process parameters and cut material type, as well as the possibility to obtain complex geometry in different dimensions with high precision. From industrial point of view, the two more competitive laser cutting technologies are based on the use of CO2 and active fiber sources, which produce samples visually different, with non-uniform surface and different depth of the striations. The quality assessment between the two laser systems within the industry is commonly based on standard ISO 9013; that covers several aspects of quality, the most used are the surface roughness and edge perpendicularity; however 2D profilometers adopted for measures are not able to analyze the complex 3D surface topography of the cutting edge. As a result, despite the fact that the differences are visually appreciated, measured 2D roughness values of different CO2 and fiber laser cutting conditions are very similar. Recently, a greater diffusion of 3D surface profilometry devices is present. These devices allow areal surface roughness parameters to be defined, which are potentially suitable to better quantify the laser cut quality. This work points out the use of a focus-variation microscopy to acquire 3D surfaces and evaluate analytically the surface quality of laser cut edges using areal surface roughness parameters. In particular, the purpose is to define a simple and repeatable method to identify the type of cutting process analyzed through the reconstruction of surface characteristics and quality of the cut-edge. As a case study, two stainless steel samples with the same geometry obtained with different laser sources, CO2 and active, fiber is presented. For comparison purposes the cutting conditions were fixed to represent the state of the art of respective laser cutting technologies, which actually show distinct cutting edge characteristics.

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Section: Introductionmentioning

confidence: 98%

On the use of Areal Roughness Parameters to Assess Surface Quality in Laser Cutting of Stainless Steel with CO2 and Fiber Sources

et al. 2015

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“…Petring et al emphasized the role of multiple reflections in laser cutting with 1 µm laser beams [15][16][17]. An extensive experimental comparison between disk and CO 2 laser beam cutting was performed by Scintilla et al [18][19][20][21][22][23]. They found differences with respect to primary power losses (reflected and transmitted laser light), cut front profiles and absorptivity behavior, as well as cut front temperature.…”

Section: Introductionmentioning

confidence: 98%

Experimental Analysis for Improvements of Process Efficiency and Cut Edge Quality of Fusion Cutting with 1μm Laser Radiation

et al. 2014

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A systematic experimental investigation of fiber laser cutting stainless steel in a wide range of material thicknesses is performed. The achievable maximum cutting speed, the resultant thermal efficiency of the process as well as the surface roughness of the cut edges were determined using different optical setups and beam geometries. In order to find out some reasons for characteristic features of the fiber laser cutting process also the cut kerf geometries were analyzed. The systematic investigation clarifies the most promising procedural possibilities for improvements of cutting performance and cut edge quality in fiber laser cutting of stainless steel.

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“…The main explanations theorized and presented in literature are related to the dynamics of material removal, and in particular the onset of recast ripples [7] and melt expulsion [8], the action of higher recoil pressures [9], the difference in the wavelength that affects the absorptivity behavior at the cutting front [10][11][12]. Particular aspects recently investigated, concerns the primary losses [13], the absorbed intensity and its derivative [14], melt accumulations and cutting front temperature [15][16][17], the role of multiple reflections [18].…”

Section: Introductionmentioning

confidence: 99%

Laser cutting of lightweight alloys sheets with 1μm laser wavelength

Scintilla

Tricarico

2013

SPIE Proceedings

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High power fiber laser sources, with a radiation wavelength equal to about 1 µm, offer a great potential in improving the productivity and quality of thin aluminum, magnesium and titanium alloys sheets cutting. This is due to their benefits that are of special interest for this application: power efficiency, beam guidance and beam quality. In this work, an overview regarding the phenomena that for different reasons affect the laser cutting of these materials was given. These phenomena include the formation of a heat affected zone, the chemical contamination, the change of corrosion resistance, the thermal reactivity, the effects of thermal conductivity, reflectivity and viscosity of molten material. The influence of processing parameters on 1 mm thick Al 1050, AZ31 and Ti6Al4V lightweight alloys were experimentally investigated and cutting performances in terms of cut quality, maximum processing speeds and severance energies were evaluated. The advantages of using 1 µm laser wavelength for thin sheets lightweight alloys cutting due to the good cut quality, high productivity and the easily delivery of the beam through the optical fiber, were demonstrated. Results showed that fiber lasers open up new solutions for cutting lightweight alloys for applications like coil sheet cutting, laser blanking, trimming and cutting-welding combination in tailor welded blanks applications.

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A comparative study on fusion cutting with disk and CO2 lasers

Cited by 23 publications

References 5 publications

On the use of Areal Roughness Parameters to Assess Surface Quality in Laser Cutting of Stainless Steel with CO2 and Fiber Sources

On the use of Areal Roughness Parameters to Assess Surface Quality in Laser Cutting of Stainless Steel with CO2 and Fiber Sources

Experimental Analysis for Improvements of Process Efficiency and Cut Edge Quality of Fusion Cutting with 1μm Laser Radiation

Laser cutting of lightweight alloys sheets with 1μm laser wavelength

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