The Influence of the Processing Parameters on the Laser-Ablation of Stainless Steel and Brass during the Engraving by Nanosecond Fiber Laser

Abstract

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 (f0) where pulse energy and average power are maximal. The maximum MRR is reached at a repetition rate that is equal or slightly higher as f0. 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.

High-Speed Erosion Behavior of Hydrophobic Micro/Nanostructured Titanium Surfaces

“…Tang [ 6 ] fabricated spike-shaped microstructured arrays on brass substrates and obtained superhydrophobic metal surfaces using pulsed ultraviolet (UV) laser ablation. Hribar et al [ 7 ] studied the influence of the processing parameters on the laser-ablation of stainless steel and brass during the engraving by nanosecond fiber laser. Yang et al [ 8 ] confirmed that the surface chemistry is not the only factor to determine surface super-hydrophobicity.…”

Influence of Heat Accumulation on Morphology Debris Deposition and Wetting of LIPSS on Steel upon High Repetition Rate Femtosecond Pulses Irradiation

“…Although the process is material-dependent [ 5 ], the study of the main processing parameters that lead to the formation of LIPSS have been identified for various metals, semiconductors and dielectrics [ 1 ], including material properties (optical [ 6 , 7 ], thermal [ 8 ], chemical [ 9 ]), processing conditions (number of effective pulses per spot unit [ 10 , 11 , 12 ], scanning direction vs. polarization [ 13 ], over-scanning [ 14 ], irradiation atmosphere [ 15 ], surface polishing [ 16 ], substrate temperature [ 17 , 18 ], material thickness [ 19 , 20 ]) and laser source parameters (wavelength [ 21 ], pulse duration [ 22 ], beam polarization [ 23 ], angle of incidence [ 24 ], and number of beams [ 25 , 26 ]). Lately, the increasing availability of affordable and stable high-repetition rate femtosecond lasers have been placed under the spotlight, with the laser repetition rate as a key processing parameter to investigate in detail [ 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. One reason is because materials irradiated at such high rates present heat accumulation effects that can affect dramatically the overall formation and performance of LIPSS [ 32 , 34 , 35 , 36 , 37 , 38 ].…”

System of machining using computer-aided design of three-tooth drills

“…At the current level of production development, it is impossible to implement the control of cutting tool manufacturing by laser ablation without fully digitizing the production cycle [1][2][3][4]. Parts with holes are an important part of mechanical engineering.…”