Picosecond and Nanosecond Pulsed Laser Ablation of Aluminium Foil

Sozzi, Michele; Tragni, K.; Selleri, Stefano; Cucinotta, Annamaria; Lutey, Adrian H. A.; Molari, Pier Gabriele; Carmignato, Simone

doi:10.1115/msec2013-1189

Cited by 3 publications

(2 citation statements)

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“…The correct control of the ablation process is a complex issue [24][25][26]. The number of controllable input variables influencing the laser ablation process and quality of the workpiece is large.…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Bohdal

Schmidtke

2022

JMES

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The paper presents the results of experimental research related to the process of cutting of t = 3 mm and t = 6 mm thick RVS 1.4301 (AISI 304, EN X5CrNi18-10) stainless steel using a fiber and CO2 lasers. The correct selection of technological parameters and the maintenance of the machines in the right technical condition allow obtaining very high quality of the cut edge, which will not require additional mechanical treatment. However, this is a complex issue. Appropriate control of the cutting process requires knowledge about the impact of individual parameters on the process and the quality of the cut edge. The influence of selected parameters and conditions of the laser cutting process on the technological quality of the obtained product was determined. The laser power and cutting speed had a significant influence on the output factors for two cutting techniques.For cutting material with a thickness of t = 3 mm with a CO2 laser, the highest quality of the cut edge was obtained using the power values P = 4200-4300 W and cutting speed v = 2100 mm/min. For the thickness t = 6 mm, the speed values should be approximately set in range v = 1600-1800 mm/min. The power value should be selected in a range from P = 3700 W to P = 4200 W. For a fiber laser with a material thickness of t = 3 mm, the best results were obtained using speeds in the range v = 2000-3300 mm/min. For the thickness of t = 6 mm, the cutting speed must be higher and in the range v = 3500-4000 mm/min while maintaining the power of about P = 4500-4800 W. The conducted experimental research can be useful on production lines in the aspect of the correct selection of technological parameters of the process due to the adopted energy and quality criteria.

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Section: Introductionmentioning

confidence: 99%

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Bohdal

Schmidtke

2022

JMES

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“…For a butt-joint configuration, for instance, the presence of a gap between the base materials is critical, being important to avoid that the beam passes through without interacting with the joining partners [5]. Therefore, a robust experimental setup is necessary to ensure repetitive and reliable results [6].…”

Section: Introductionmentioning

confidence: 99%

Selection of parameters in nanosecond pulsed wave laser micro-welding

Coroado

Ganguly

Suder

et al. 2021

Int J Adv Manuf Technol

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The digital control of the latest nanosecond pulsed wave (PW) fibre lasers allows very high flexibility in controlling the application of the total energy to a workpiece, which brings several advantages to the joining process. By choosing different pulse shapes in different spatial profiles, it is possible to apply low energy per pulse with high precision and accuracy resulting in lower heat input. Since the energy of each pulse is insufficient to generate melting, these lasers operate at very high pulse repetition frequencies near continuous wave (CW) regime. Nevertheless, the peak powers of PW lasers are much higher than CW. In this research, the effect of peak power, pulse energy, pulse width, pulse repetition frequency and duty cycle has been studied. The experimental work was conducted in bead on plate of austenitic stainless steel to investigate the effect of laser on the weld geometry, i.e. depth of penetration and width. An empirical model, previously established for CW mode, which enables the achievement of a particular penetration depth independent of the beam diameter, was redesigned and tested for PW mode. The “pulse power factor model” allows the laser user to select a weld profile that meets certain quality and productivity requirements independent of the laser system. It was shown that identical depth of penetration but different weld metal profile can be obtained for a specific beam diameter for a range of different system parameters by keeping a constant trade-off between pulse power factor and interaction time.

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Investigating crater formation in nanosecond laser ablation of aluminum foils

Mohajan,

Beier,

Hussein

2024

Journal of Applied Physics

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A nanosecond Nd:YAG laser was used to study the laser ablation of aluminum foil in the phase explosion regime at a laser intensity range of 0.63–3.61 ×1012W/cm2. Laser ablation and plasma characteristics were studied using microscopic ablation crater images, plasma emission spectra, and plasma plume images. Measured plasma density using a Stark width of Al I (396.2 nm) showed a strong linear correlation with crater size, with a Pearson correlation coefficient (r) of 0.97. To understand the origin of this linear correlation, plasma temperature was estimated using Bremsstrahlung emission from 512 to 700 nm. The estimated plasma temperature and aspect ratio of the plasma plume were negatively correlated, having r=−0.76. This negative correlation resulted from a laser-plasma interaction, which heated the plasma and increased its hydrodynamic length. The percentages of laser energy used for plasma heating (Ep/EL) and Al foil ablation (EAl/EL) were estimated from plasma temperature. Increased EAl/EL, such as crater size, with increasing laser intensity, confirms that greater mass ablation is the fundamental reason for the strong linear correlation between crater size and plasma density.

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Picosecond and Nanosecond Pulsed Laser Ablation of Aluminium Foil

Cited by 3 publications

References 0 publications

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Selection of parameters in nanosecond pulsed wave laser micro-welding

Investigating crater formation in nanosecond laser ablation of aluminum foils

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