Experimental Investigations on Fusion Cutting Stainless Steel with Fiber and CO2 Laser Beams

Stelzer, Steffen; Mahrle, Achim; Wetzig, Andreas; Beyer, Eckhard

doi:10.1016/j.phpro.2013.03.093

Cited by 48 publications

(17 citation statements)

References 13 publications

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“…A large number of publications, e.g., [21][22][23], experimentally investigate CO 2 laser cutting at 10.6 lm and more recent publications [1,7,10,24], due to the emergence of high-power fiber and disk lasers, started to present results at 1.03 lm. Here, we compare our theoretical model to experiments published on a comparative study of inert gas fusion cutting of 5-and 8-mm-thick 90MnCrV8 workpieces at 1.03 and 10.6 lm, respectively [1].…”

Section: Resultsmentioning

confidence: 99%

Comparative theoretical analysis of continuous wave laser cutting of metals at 1 and 10 μm wavelength

Brügmann

Feurer

2014

Appl. Phys. A

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We present a derivation and, based on it, an extension of a model originally proposed by V.G. Niziev to describe continuous wave laser cutting of metals. Starting from a local energy balance and by incorporating heat removal through heat conduction to the bulk material, we find a differential equation for the cutting profile. This equation is solved numerically and yields, besides the cutting profiles, the maximum cutting speed, the absorptivity profiles, and other relevant quantities. Our main goal is to demonstrate the model's capability to explain some of the experimentally observed differences between laser cutting at around 1 and 10 lm wavelengths. To compare our numerical results to experimental observations, we perform simulations for exactly the same material and laser beam parameters as those used in a recent comparative experimental study. Generally, we find good agreement between theoretical and experimental results and show that the main differences between laser cutting with 1-and 10-lm beams arise from the different absorptivity profiles and absorbed intensities. Especially the latter suggests that the energy transfer, and thus the laser cutting process, is more efficient in the case of laser cutting with 1-lm beams.

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Section: Resultsmentioning

confidence: 99%

Comparative theoretical analysis of continuous wave laser cutting of metals at 1 and 10 μm wavelength

Brügmann

Feurer

2014

Appl. Phys. A

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“…For example, an Nd:YAG laser having an average output power of only 500 W, but a peak power of 9 kW has been utilized in the present experiment, which is having much higher peak power as compared to a 500 W CW laser and is comparable in cutting performance with a 9 kW CW laser. For laser cutting of thicker materials, pulsed lasers with high peak power are better than CW lasers in terms of low heat affected zone (HAZ) and low thermal distortion in the material [12][13][14][15]. For pulsed laser cutting, steel, t p is the laser pulse duration, and t d is the dwell time or laser interaction time of the laser beam of spot diameter S traveling with a speed v. For pulsed Nd:YAG laser cutting of thick section steel, millisecond (ms) duration pulses are preferable, since thermal time constant for thick sheet of stainless steel is of the order of tens of ms for a given power density of 10 5 W/cm 2 [17].…”

Section: Introductionmentioning

confidence: 99%

Studies on pulsed Nd:YAG laser cutting of thick stainless steel in dry air and underwater environment for dismantling applications

Choubey

Jain

Ali

et al. 2015

Optics & Laser Technology

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“…The debates concerning the two technologies are very kindle especially around the quality of the cut-edge surface. Fiber lasers have two distinctive features concerning the cut of thick sheets: the apparent loss of the efficiency with the increase of the material thickness and on the other side the increase of the surface roughness for thick sheet (can be considered true for thickness above 4 mm) [2]. These differences can be explained considering the inclination angle of the cut front of laser fusion cutting.…”

Section: Introductionmentioning

confidence: 99%

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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Experimental Investigations on Fusion Cutting Stainless Steel with Fiber and CO2 Laser Beams

Cited by 48 publications

References 13 publications

Comparative theoretical analysis of continuous wave laser cutting of metals at 1 and 10 μm wavelength

Comparative theoretical analysis of continuous wave laser cutting of metals at 1 and 10 μm wavelength

Studies on pulsed Nd:YAG laser cutting of thick stainless steel in dry air and underwater environment for dismantling applications

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

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