Application of high power pulsed nanosecond fibre lasers in processing ultra-thin aluminium foils

Banat, D.; Ganguly, Saibal; Meco, Sónia; Harrison, Paul M.

doi:10.1016/j.optlaseng.2020.106075

Cited by 33 publications

(15 citation statements)

References 39 publications

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“…Consequently, there is a reduction of energy loss between pulses, keeping the penetration depth constant. This is even more evident when the pulse overlapping is high, creating a cumulative energy effect of the laser radiation through several pulses [14].…”

Section: Effect Of Beam Diametermentioning

confidence: 99%

“…Below PRF 0 , the pulse energy remains constant, but the average power reduces proportionally to the frequency reduction. Above PRF 0 , the pulse energy decreases when the frequency increases [14], as given by Eq. (1).…”

Section: Definition Of the Fundamental Laser-materials Interaction Parametersmentioning

confidence: 99%

“…The average peak power density (q p, peak ) in PW processing is defined as the ratio of the average peak power by the area of the laser spot, as given by Eq. (6) [14]:…”

Section: Definition Of the Fundamental Laser-materials Interaction Parametersmentioning

confidence: 99%

“…15c for a t i of 5 ms is extremely high, being the thermal losses also higher for a constant average peak power which is not able to create more material vaporisation, leading to a reduction in penetration depth. Thus, it can be concluded that, in pulsed wave welding, higher t i and consequently higher E SP, pulse give the necessary cumulative heating effect to generate more material melting and increase the penetration depth, counteracting the high energy dissipation between pulses that the small heat source is subjected in comparison to the bulk material [14]. However, there is a limit in the trade-off between q p, peak and E SP, pulse to increase the penetration depth for a certain beam diameter and this limit is reached sooner for smaller beam diameters.…”

Section: Effect Of Pulse Power Factor and Interaction Time For Pw Weldingmentioning

confidence: 99%

“…These lasers provide a cost-effective solution, being integrated into different industrial applications given the variety of temporal pulse shapes, also known as waveforms [9,10]. Normally nanosecond lasers are used for material removal processes such as cutting [11], drilling [12], engraving and machining [13,14] due to short pulse duration and high peak powers, but when operated at a high repetition rate, they can be used for precision welding [15], being able to minimise thermal damages, welding distortion and porosity formation [16]. However, in some applications, where higher fit-up tolerance and penetration depth are required, the CW lasers are often the best choice [17,18].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Beam Diametermentioning

confidence: 99%

Section: Definition Of the Fundamental Laser-materials Interaction Parametersmentioning

confidence: 99%

“…The average peak power density (q p, peak ) in PW processing is defined as the ratio of the average peak power by the area of the laser spot, as given by Eq. (6) [14]:…”

Section: Definition Of the Fundamental Laser-materials Interaction Parametersmentioning

confidence: 99%

Section: Effect Of Pulse Power Factor and Interaction Time For Pw Weldingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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High‐Power Laser in Material Processing Applications

Jagadeesha,

Kunar

2024

Laser‐Assisted Machining

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Comparison of continuous and pulsed wave lasers in keyhole welding of stainless-steel to aluminium

Coroado

Ganguly

Williams

et al. 2021

Int J Adv Manuf Technol

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A continuous wave (CW) and a nanosecond pulsed wave (PW) lasers were used to join 1-mm thick sheets of SS304L (SS) austenitic stainless-steel to AA5251 (Al) aluminium alloy in an overlap joint configuration. The weld shape (penetration depth and width), intermetallic compounds concentration, weld quality (cracking and porosity) and mechanical strength were correlated with the process energy and compared between each laser temporal mode. Successful CW joints were produced with the SS sheet on top of the Al, but the opposite configuration revealed to be impossible for the range of parameters tested. The PW joints were successful with the Al sheet on top of SS, but all the joints cracked at the interface when the opposite configuration was used. The mechanical tests showed that even though it is possible to achieve higher tensile shear load in CW welds due to the larger bonding area, the tensile shear strength revealed to be almost 5 × higher for PW welds at similar applied energy.

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Application of high power pulsed nanosecond fibre lasers in processing ultra-thin aluminium foils

Cited by 33 publications

References 39 publications

Selection of parameters in nanosecond pulsed wave laser micro-welding

Selection of parameters in nanosecond pulsed wave laser micro-welding

High‐Power Laser in Material Processing Applications

Comparison of continuous and pulsed wave lasers in keyhole welding of stainless-steel to aluminium

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