Dross formation modeling in the laser beam cutting process using energy-based and gas-based parameters

Nabavi, Seyedeh Fatemeh; Farshidianfar, Mohammad H.; Farshidianfar, Anoshirvan; Marandi, Saeed

doi:10.1007/s00170-022-09019-0

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Doubling or tripling the cutting velocity is not uncommon when comparing oxygen to inert gases. It was concluded that the decrease in dross in the oxygen specimen was most likely due to a change in the melt surface tension or viscosity, and the combustion reaction was a contributing factor that aided in expelling dross [45].…”

Section: Dross Analysismentioning

confidence: 99%

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The Effect of Assist Gas Type on Nitinol Microsecond Laser Cut Edges: A Study on the Use of Oxygen, Argon, Nitrogen, Helium, and Compressed Air

Otto,

Doroudi,

Vaseghi

et al. 2024

Preprint

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Historically, the published literature for laser cutting atomically balanced nickel-titanium alloy tubular devices assumes an inert argon assist gas is required for the laser cutting process, resulting in slower cutting rates. Herein, a novel application of an exothermic reactive oxygen assist gas during Nitinol laser micromachining enabled a 38.1 mm/s cut rate, a 4.5-times improvement from other studies, with the realization of improved cut quality: 2-times less dross, 2-times lower surface roughness, and a minimal heat-affected zone. Of the tested assist gases (oxygen, argon, nitrogen, helium, and compressed air), oxygen was found to provide the best cut quality, achieving dross-free cuts. Additionally, oxygen was shown to produce a relatively low arithmetic mean average surface roughness of 0.48 μm, when compared to argon at 0.85 μm. A decrease in surface roughness was found to be associated with an increase in cut rate. These findings suggest that assist gas melt flow dynamics has a higher contributing factor than laser pulse energy parameters. In-situ thermographic monitoring of melt flow during processing demonstrated a clear difference in the melt flow pattern between a reactive oxygen assist gas and inert argon assist gas. Furthermore, with the culmination of nanoindentation analysis and microstructural characterization, it was concluded that long-pulse laser machining can produce cuts with negligible microstructural grain recrystallization of the bulk material. This study quantitatively demonstrates that there are potential benefits observed during laser cutting Nitinol with a reactive oxygen assist gas when compared to previous studies that employ an inert argon assist gas.

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Section: Dross Analysismentioning

confidence: 99%

“…This effect may be able to be modeled by Equation 2, where an increase in cut rate (v) would result in a smaller dross height, d H (y) [46,47].…”

Section: Dross Analysismentioning

confidence: 99%

The Effect of Assist Gas Type on Nitinol Microsecond Laser Cut Edges: A Study on the Use of Oxygen, Argon, Nitrogen, Helium, and Compressed Air

Otto,

Doroudi,

Vaseghi

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

An applicable review on recent laser beam cutting process characteristics modeling: geometrical, metallurgical, mechanical, and defect

Nabavi,

Farshidianfar,

Dalir

2023

Int J Adv Manuf Technol

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Accuracy evolution and path compensation in 3D laser cutting process for advanced high strength steel parts: numerical analysis and experimental investigation

Wang

Pang

et al. 2022

Int J Mater Form

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Dross formation modeling in the laser beam cutting process using energy-based and gas-based parameters

Cited by 4 publications

References 29 publications

The Effect of Assist Gas Type on Nitinol Microsecond Laser Cut Edges: A Study on the Use of Oxygen, Argon, Nitrogen, Helium, and Compressed Air

The Effect of Assist Gas Type on Nitinol Microsecond Laser Cut Edges: A Study on the Use of Oxygen, Argon, Nitrogen, Helium, and Compressed Air

An applicable review on recent laser beam cutting process characteristics modeling: geometrical, metallurgical, mechanical, and defect

Accuracy evolution and path compensation in 3D laser cutting process for advanced high strength steel parts: numerical analysis and experimental investigation

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