&lt;title&gt;Gas hydrodynamics of CW laser cutting of metals in inert gas&lt;/title&gt;

Makashev, N. K.; Asmolov, Evgeny S.; Blinkov, V. V.; Boris, A. Yu.; Бурмистров, А. В.; Buzykin, O. G.; Makarov, Valeri A.

doi:10.1117/12.171629

Cited by 19 publications

(26 citation statements)

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“…An interesting point is that, at V = 2 m/min, the velocity of continuous flow was observed to be 3.2 m/s, whereas the velocity of humps was 0.2 m/s. It is not surprising to observe this difference, because the evolution of hump is not a mass flow but an evolution of phase as already pointed out [15,16,18].…”

Section: (Iv) V = 2 M/minmentioning

confidence: 97%

“…Meanwhile, an important point firstly shown by the present observation is that there is a regime where we observe simultaneously both the stable and unstable flows, in the central and side regions, respectively. In most of the theoretical works in the past, it has been assumed that the instability in the central part naturally perturbs the flow in the side region [14][15][16][17]. This kind of assumptions should be rejected for the intermediate regime.…”

Section: (V) V = 1 M/minmentioning

confidence: 99%

“…It has been t=0 ms t=1.5 ms t=2.5 ms t=4. already discussed that the regime of humps involves such plateaus around the humps [14][15][16][17][18].…”

Section: (V) V = 1 M/minmentioning

confidence: 99%

“…However, it seems that the initiation of the striations at the top part of the kerf should be driven by another physical process. More promising candidate is the instability of thermal dynamics, which generates bunches of molten material (humps) sliding down the kerf front [14][15][16][17][18]. This seems to be promising to explain the initiation of striations, because it is related to the peculiarity of temperature field around the top part of the kerf.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of hydrodynamics of melt layer during laser cutting of steel

Hirano¹,

Fabbro²

2011

J. Phys. D: Appl. Phys.

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract. In laser cutting process, understanding of hydrodynamics of melt layer is significant, because it is an important factor which controls the final quality. In this work, we observed hydrodynamics of melt layer on kerf front in the case of laser cutting of steel with inert gas. The observation shows that the melt flow on the kerf front exhibits strong instability, depending on cutting velocity. In intermediate range of velocity, the flow on the central part of the kerf front is continuous, whereas the flow along the sides is discontinuous. It is firstly confirmed that the instability in the side flow is the cause of the striation initiation from the top part of the kerf. The origin of the instability is discussed in terms of instabilities in thermal dynamics and hydrodynamics. The proposed model shows reasonable agreement with experimental results.

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Section: (Iv) V = 2 M/minmentioning

confidence: 97%

Section: (V) V = 1 M/minmentioning

confidence: 99%

“…It has been t=0 ms t=1.5 ms t=2.5 ms t=4. already discussed that the regime of humps involves such plateaus around the humps [14][15][16][17][18].…”

Section: (V) V = 1 M/minmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of hydrodynamics of melt layer during laser cutting of steel

Hirano¹,

Fabbro²

2011

J. Phys. D: Appl. Phys.

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“…It was expressed on the basis of the local drilling velocity, which depends on the local laser absorbed intensity and on the local inclination angle of the kerf front. In another paper, Makashev et al [11] proposed an estimation of roughness parameters of the cut walls, with the pressure and velocity distribution over the cutting front. Kaplan [12] proposed a simple analytical model for laser cutting with oxygen and inert assist gases.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on high-power laser cutting of metals

et al. 2015

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract A theoretical approach based on a numerical simulation using experimental data is proposed as a contribution for the study of laser metal cutting under gas assistance. The aim is to simulate the stages of the kerf formation by considering the induced generated melt film dynamics, while it interacts with the laser beam and the assisting gas jet. For normal atmospheric conditions, a 3D model is developed using the finite volume method to solve the governing hydrodynamic equations, supplied with the species conservation equation. The present air, the metallic liquid, and the solid metal are considered as phases, where the interface positions are tracked by implementation of the volume-of-fluid method through Fluent CFD code, whereas an enthalpic method is used to take into account the material melting and resolidification. The results for six operating conditions in relation to the cutting velocity show an interesting agreement with the experimental observations.

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Laser Beam Machining

Sun

Brandt

2013

Nontraditional Machining Processes

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<title>Gas hydrodynamics of CW laser cutting of metals in inert gas</title>

Cited by 19 publications

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Experimental investigation of hydrodynamics of melt layer during laser cutting of steel

Experimental investigation of hydrodynamics of melt layer during laser cutting of steel

Numerical investigations on high-power laser cutting of metals

Laser Beam Machining

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