The influence of the processing parameters on the laser-ablation of stainless steel and brass during the engraving by nanosecond fiber laser

Hribar, Luka (author), Gregorčič, Peter (author), Senegačnik, Matej (author), Jezeršek, Matija (author)

In this paper, we investigate the influence of the following parameters: pulse duration, pulse repetition rate, line-to-line and pulse-to-pulse overlaps, and scanning strategy on the ablation of AISI 316L steel and CuZn37 brass with a nanosecond, 1064-nm, Yb fiber laser. The results show that the material removal rate (MRR) increases monotonically with pulse duration up to the characteristic repetition rate (f$_0$) where pulse energy and average power are maximal. The maximum MRR is reached at a repetition rate that is equal or slightly higher as f$_0$. The exact value depends on the correlation between the fluence of the laser pulses and the pulse repetition rate, as well as on the material properties of the sample. The results show that shielding of the laser beam by plasma and ejected material plays an important role in reducing the MRR. The surface roughness is mainly influenced by the line-to-line and the pulse-to-pulse overlaps, where larger overlap leads to lower roughness. Process optimization indicates that while operating with laser processing parameters resulting in the highest MRR, the best ratio between the MRR and surface roughness appears at ~50% overlap of the laser pulses, regardless of the material being processed.

• Language: English
• Keywords: laser ablation, engraving, fiber lasers, material removal rate, laser-material interaction
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 19 str.
• Numbering: Vol. 12, iss. 2, art. 232
• PID: 20.500.12556/RUL-134385
• UDC: 535
• ISSN on article: 2079-4991
• DOI: 10.3390/nano12020232
• COBISS.SI-ID: 93100547
• Publication date in RUL: 12.01.2022

Record is a part of a journal

• Title: Nanomaterials
• Shortened title: Nanomaterials
• Publisher: MDPI AG
• ISSN: 2079-4991
• COBISS.SI-ID: 523286297

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 11.01.2022

Secondary language

• Language: Slovenian
• Keywords: laserska ablacija, graviranje, vlakenski laserji