Mechanical characteristics of high-quality laser cutting of steel by fiber and CO2 lasers

Fomin, V. M.; Голышев, А. А.; Маликов, А. Г.; Orishich, A. M.; Shulyat'ev, Viktor B

doi:10.1134/s0021894415040203

Cited by 21 publications

(12 citation statements)

References 15 publications

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“…This approach has been well approved for the laser cutting of low-carbon and high-alloyed steel sheets by the criterion of the minimal cut surface roughness [12]. The authors have found the areas of the optimal (minimal roughness) application in the dimensional parameter area: the Peclet number Pe = Vb/γ and dimensionless power Be = W/(hλΔT), where λ and γ are the heat-and temperature conductivity coefficients.…”

Section: Resultsmentioning

confidence: 99%

Optimization of laser cladding on the base of additive technologies of metal-ceramic powders

Orishich

Голышев

Маликов

et al. 2017

AIP Conference Proceedings

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Abstract. The paper contains experimental researches of the creation of the functionally-gradient heterogeneous materials based on metal-ceramic powders using the laser cladding method. Optimal conditions have been found for the creation of qualitative additive monolithic layers, the layer has minimal roughness and no pores, metal-ceramic coatings regarding the laser action parameters and coating composition, deposition technique, ceramic powder size and metal binder. Experimental data have been gathered on the morphology and microstructure of the clad layers versus the coating composition and laser action parameters.

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Section: Resultsmentioning

confidence: 99%

Optimization of laser cladding on the base of additive technologies of metal-ceramic powders

Orishich

Голышев

Маликов

et al. 2017

AIP Conference Proceedings

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“…The lens focal distance was 200 mm. Also, the СО 2 laser [5] with a self-filtering resonator was applied; its power reached 8 kW, and the ВРР = 4.7 mm·mrad at the focal distance of the ZnSe lens of 127 and 190 mm.…”

Section: Aw + W Ox = W M + W Condmentioning

confidence: 99%

“…Note that, to have experimental data for each energy flux, the optimal laser power value W, cutting speed V and cut width b, were found for each thickness t, absorption coefficients А and power losses due to the thermal conductivity were measured for these values (measurement techniques are presented in [1,5]. Obtained data enabled to determine the values W m , AW, W cond .…”

Section: Aw = W M + W Condmentioning

confidence: 99%

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Thermophysical problems of laser cutting of metals

et al. 2017

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Abstract. Variety and complex interaction of physical processes during laser cutting is a critical characteristic of the laser cutting of metals. Small spatial and temporal scales complicate significantly the experimental investigations of the multi-phase fluid flow in the conditions of laser cutting of metals. In these conditions, the surface formed during the cutting is an indicator determining the melt flow character. The quantitative parameter reflecting the peculiarities of the multi-phase fluid flow, is normally the roughness of the forming surface, and the minimal roughness is the criterion of the qualitative flow [1 -2]. The purpose of this work is to perform the experimental comparative investigation of the thermophysical pattern of the multi-phase melt flow in the conditions of the laser cutting of metals with the laser wavelength of 10.6 μm and 1.07 μm.During the laser cutting, the local material melting and melt removal by an assistant gas jet take place. Cutting of low-carbon steel sheets is usually carried out in an oxygen jet (oxygen-assisted laser cutting). In this case, the exothermic reaction of iron oxidation is an additive energy source. The power balance for the oxygen-assisted laser cutting and the cutting with a chemically inert gas is written respectively as:where A is the absorption coefficient; W is the laser power; W ox is the power released at the exothermic reaction; W m is the power consumed for melting; and W cond is the power lost from the cut region due to thermal conductivity. In

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“…For example, the problem of calibrating the hot-wire probe against the velocity was appeared during study characteristics of the flow disturbances in the discharge zone of the CO 2 laser due to great effect of flow disturbances on the power of the laser [12,13]. As far as it was impossible to use any other method for measuring the average and unsteady velocity components, the hot-wire technique has been used [14].…”

Section: Introductionmentioning

confidence: 99%

Determination of the heat transfer for a hot-wire with the use of the Couette flow

Lebiga

Zinoviev

Pak

et al. 2017

AIP Conference Proceedings

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Annotation. The modeling of the Couette flow in a circular gap between coaxial cylinders is considered, including rarefied gas conditions at large Knudsen numbers. When developing the experimental facility for this purpose, the geometric sizes were determined taking into account minimum deviation of the velocity profile in the gap from the linear one in the case of laminar flow regime, and also to prevent the formation of Taylor-Görtler vortices with the chosen flow parameters. A series of tests was performed using the hot-wire at atmospheric pressure. It was cofirmed the operability of the facility itself and satisfactory matching of the hot-wire calibration data using the proposed method in the Couette flow and standard data obtained in the DISA calibration wind tunnel. Preliminary data for influence the Knudsen number on the heat transfer between the hot-wire probe and flow.

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Mechanical characteristics of high-quality laser cutting of steel by fiber and CO2 lasers

Cited by 21 publications

References 15 publications

Optimization of laser cladding on the base of additive technologies of metal-ceramic powders

Optimization of laser cladding on the base of additive technologies of metal-ceramic powders

Thermophysical problems of laser cutting of metals

Determination of the heat transfer for a hot-wire with the use of the Couette flow

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