Selection of parameters in nanosecond pulsed wave laser micro-welding

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dc.contributor.authorCoroado, Julio
dc.contributor.authorGanguly, Supriyo
dc.contributor.authorSuder, Wojciech
dc.contributor.authorWilliams, Stewart
dc.contributor.authorMeco, Sonia
dc.contributor.authorPardal, Goncalo
dc.date.accessioned2021-06-09T15:47:16Z
dc.date.available2021-06-09T15:47:16Z
dc.date.issued2021-05-31
dc.description.abstractThe 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.en_UK
dc.identifier.citationCoroado J, Ganguly S, Suder W, et al., (2021) Selection of parameters in nanosecond pulsed wave laser micro-welding. International Journal of Advanced Manufacturing Technology, Volume 115, Issue 9-10, August 2021, pp. 2929-2944en_UK
dc.identifier.issn0268-3768
dc.identifier.urihttps://doi.org/10.1007/s00170-021-07251-8
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16751
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectWeld shapeen_UK
dc.subjectDepth of penetrationen_UK
dc.subjectMicro-weldingen_UK
dc.subjectPulse power factor modelen_UK
dc.titleSelection of parameters in nanosecond pulsed wave laser micro-weldingen_UK
dc.typeArticleen_UK

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