Effect of Laser Cutting Parameters on the Heat Affected Zone and on the Boundary Layer in Steel Laser Processing

Aggoune, Samia; Abid, C.; Amara, El-Hachemi

doi:10.4028/www.scientific.net/ddf.399.154

Cited by 3 publications

(4 citation statements)

References 17 publications

(19 reference statements)

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“…Previous investigations obtained burr-free and smooth cut edges when the material has a small HAZ and recast layer width [3,11,19,42]. Furthermore, for static beam shaping, the HAZ area decreases, whereas the recast layer width grows at an accelerating cutting speed [11,19,42,[44][45][46]. However, referring to the results shown in Figures 3 and 7, a significant correlation has been observed between the amplitude, cutting speed, HAZ area, burr height, and surface roughness for beam oscillation.…”

Section: Explanatory Approach Of the Process Improvements Due To Beam...mentioning

confidence: 64%

“…Indications deliver the HAZ and recast layer analysis (Figure 7). Previous investigations obtained burr-free and smooth cut edges when the material has a small HAZ and recast layer width [3,11,19,42]. Furthermore, for static beam shaping, the HAZ area decreases, whereas the recast layer width grows at an accelerating cutting speed [11,19,42,[44][45][46].…”

Section: Explanatory Approach Of the Process Improvements Due To Beam...mentioning

confidence: 94%

“…The pearlite grains transforming through heat input and indicate the beginning HAZ (Figure 5b and c). It is known that high-quality cuts require a small HAZ with preferably no recast layer [3,11,19,42]. Moreover, parallel and ample cut kerfs simplify the removal of the cut parts from the remaining plate.…”

Section: Metallographic Analysis Of Mild Steel To Reveal the Thermal ...mentioning

confidence: 99%

“…Contrary to ideal desires, the cut kerf varies greatly and has no straight-line boundaries. The recast layer attaches It is known that high-quality cuts require a small HAZ with preferably no recast layer [3,11,19,42]. Moreover, parallel and ample cut kerfs simplify the removal of the cut parts from the remaining plate.…”

Section: Metallographic Analysis Of Mild Steel To Reveal the Thermal ...mentioning

confidence: 99%

See 3 more Smart Citations

Improvement of Laser Beam Fusion Cutting of Mild and Stainless Steel Due to Longitudinal, Linear Beam Oscillation

et al. 2020

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The latest research on laser beam fusion cutting (LBFC) with static beam shaping have shown a limitation in the quality of cut parts for thick steel plates (> 6 mm) when using solid state lasers. The approach of dynamic beam oscillation has recently shown to be capable of overcoming this challenge, allowing to increase the cutting speed as well as improving cut edge quality beyond the state of the art. The present paper investigates the influence of longitudinal, linear beam oscillation in LBFC of 12 mm mild and stainless steel plates by analyzing different parameters as cutting speed, burr, surface roughness, heat affected zone (HAZ), and recast layer. Reasons for the observed process improvements compared to static beam shaping have been discussed. The adjustment of the energy deposition and interaction time of the laser beam with the material found to be most relevant for optimizing the LBFC process. In particular, for beam oscillation, a gradual energy deposition takes place and increases the interaction time. This reduces the heat input in terms of HAZ and recast layer by more than 50%, resulting in high cut edge quality and more than 70% faster cutting speed.

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Section: Explanatory Approach Of the Process Improvements Due To Beam...mentioning

confidence: 64%

Section: Explanatory Approach Of the Process Improvements Due To Beam...mentioning

confidence: 94%

Section: Metallographic Analysis Of Mild Steel To Reveal the Thermal ...mentioning

confidence: 99%

Section: Metallographic Analysis Of Mild Steel To Reveal the Thermal ...mentioning

confidence: 99%

See 2 more Smart Citations

Improvement of Laser Beam Fusion Cutting of Mild and Stainless Steel Due to Longitudinal, Linear Beam Oscillation

et al. 2020

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Experimental study of heat affected zone for CO2 and fiber laser machining of SS 316L material

Sargar,

Jadhav,

Kumar Gautam

2023

Materials Today: Proceedings

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Laser fusion cutting: The missing link between gas dynamics and cut edge topography

Borkmann,

Mahrle,

Wetzig

2023

Journal of Laser Applications

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In laser cutting, the fundamental role of the gas flow for melt removal and kerf formation is generally accepted. Beyond this vague understanding, however, the underlying physical mechanisms are not yet fully understood. In particular, detailed data concerning the momentum and heat transfer between the gas and melt have seldom been reported. This study addresses the local interactions between the cutting gas and kerf surface (melt film surface) in a fundamental way based on a combined experimental, theoretical, and numerical approach. Typical solid-state laser cut edges are analyzed considering the characteristic surface structures and the basic influences of the gas flow on the global and local melt movement. Here, apparent structures in the micrometer range indicate the effect of vortical gas structures close to the wall. Theoretical investigation of the gas boundary layer is conducted by semiempirical equations and the transfer of basic results from the boundary layer theory. It is shown that the boundary layer is in transition between the laminar and turbulent flow, and local flow separations and shock-boundary layer interactions primarily induce spatially periodic and quasistationary instability modes. An improved numerical model of the cutting gas flow confirms the theoretical results and exhibits good agreement with experimental cut edges, reproducing relevant instability modes and quantifying the local momentum and heat transfer distributions between the gas and melt. With the knowledge gained about the underlying physical mechanisms, promising approaches for improvements of the fusion cutting performance are proposed.

show abstract

Effect of Laser Cutting Parameters on the Heat Affected Zone and on the Boundary Layer in Steel Laser Processing

Cited by 3 publications

References 17 publications

Improvement of Laser Beam Fusion Cutting of Mild and Stainless Steel Due to Longitudinal, Linear Beam Oscillation

Improvement of Laser Beam Fusion Cutting of Mild and Stainless Steel Due to Longitudinal, Linear Beam Oscillation

Experimental study of heat affected zone for CO2 and fiber laser machining of SS 316L material

Laser fusion cutting: The missing link between gas dynamics and cut edge topography

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