Dynamics of ripple formation and melt flow in laser beam cutting

Schulz, Wolfgang; Kostrykin, Vadim; Nießen, Markus; Micheľ, J.; Petring, Dirk; Kreutz, E. W.; Poprawe, Reinhart

doi:10.1088/0022-3727/32/11/307

Cited by 72 publications

(30 citation statements)

References 13 publications

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“…One idea is to attribute the striations to external fluctuation of operating parameters such as laser power and gas flow rate, which can change the energy and momentum balances [10,11]. But this does not seem to be a primary mechanism, considering the fact that the striations have excellent regularity in most cases and that typical pitch (wavelength) of striations is in the range of 100 m regardless of laser and gas systems.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Hirano¹,

Fabbro²

2011

J. Phys. D: Appl. Phys.

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“…9 The reasons for striation origination has become an object for numerous research papers. [10][11][12] Striations are inherent to both oxygen and inert gas cutting. There are many models proposed and reasons enumerated that may cause striations: fluctuations of laser power, unstable kinetics of the oxidation reaction, instability in melt film flow, instability in fusion front movement, etc.…”

Section: Introductionmentioning

confidence: 99%

Visualization of events inside kerfs during laser cutting of fusible metal

Yudin

Ковалев

2009

Journal of Laser Applications

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The subject of the research is mechanism of melt removal and striated roughness generation. Being the main obstacle limiting laser cutting process performance, these phenomena are widely discussed. Available theoretical descriptions are not conclusive, as they have nothing to be verified with. High temperatures and narrowness of the kerf severely limit visual access at a real facility. Observation will become possible if one wall of the kerf is made of glass. This possibility is utilized in present experiments, which reproduce the process at low temperatures. Rose’s alloy (melting at 96 °C) is cut by reduced power laser beam (below 300 W) and high-speed photographic recordings are done. The experiments are carried out for thick materials (10 and 20 mm) under cut. Examination of the video data brought out innovative views on the melt removal. The cutting front was noted to be upright. The striation structure was observed to be generated at a certain distance from the cutting front and without direct assistance of laser radiation. Adequacy of the model experiment to the real case was confirmed by direct comparison of surfaces and by analysis of similarity relations.

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“…Unfortunately, a typical drawback of fiber lasers is that along the cut ripples are generated, see [26,28,33]. The modeling of these ripples often relies on the introduction of imperfections in the metal or of inaccuracies in the laser management, see also [25,27]. Here, using realistic numeric parameters and in spite of the rather simplified physics involved, in Section 3 we present a first preliminary model capable of describing the formation of a geometry similar to the ripples observed in industrial cuts.…”

Section: Introductionmentioning

confidence: 99%

Nonlocal systems of balance laws in several space dimensions with applications to laser technology

Colombo

Marcellini

2015

Journal of Differential Equations

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For a class of systems of nonlinear and nonlocal balance laws in several space dimensions, we prove the local in time existence of solutions and their continuous dependence on the initial datum. The choice of this class is motivated by a new model devoted to the description of a metal plate being cut by a laser beam. Using realistic parameters, solutions to this model obtained through numerical integrations meet qualitative properties of real cuts. Moreover, the class of equations considered comprises a model describing the dynamics of solid particles along a conveyor belt.

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Dynamics of ripple formation and melt flow in laser beam cutting

Cited by 72 publications

References 13 publications

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

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

Visualization of events inside kerfs during laser cutting of fusible metal

Nonlocal systems of balance laws in several space dimensions with applications to laser technology

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