New phenomenological model for comparison of lasers with different temporal outputs

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dc.contributor.authorCoroado, Julio
dc.contributor.authorWilliams, Stewart W.
dc.contributor.authorSuder, Wojciech
dc.contributor.authorGanguly, Supriyo
dc.contributor.authorMeco, Sonia
dc.contributor.authorPardal, Goncalo
dc.date.accessioned2022-04-08T13:03:16Z
dc.date.available2022-04-08T13:03:16Z
dc.date.issued2022-04-06
dc.description.abstractLaser welding is distinguished by low heat input, low distortion, high travel speeds and accuracy. Traditional high-power pulsed wave (PW) lasers are being replaced by high-frequency low-pulse energy fibre lasers. However, as these lasers operate at very high frequencies, near continuous wave (CW) operation, it is not clear the benefit of such frequencies in comparison to CW lasers for micro-welding. In this project, two lasers, one in high-frequency PW and another in CW are operated at the same conditions, including average power, average peak power, spot size and travel speed, and the differences in material response are investigated. It has been shown that frequency is one of the important parameters that affect the heat loss between individual pulses, referred to as inter-pulse losses. At low frequency, the PW laser provided lower melting efficiency and higher penetration efficiency than CW. On the other hand, at high frequency, the PW resulted in lower melting and penetration efficiency than CW. In addition, a new definition of interaction time has been proposed to capture conduction losses by travel speed and heat inter-pulse losses due to periodic lack of laser power. This allows a like-for-like comparison of CW and PW lasers and can be used to predict penetration depth with processing parameters.en_UK
dc.identifier.citationCoroado J, Williams S, Suder W, et al., (2022) New phenomenological model for comparison of lasers with different temporal outputs. The International Journal of Advanced Manufacturing Technology, Volume 120, Issue 9-10, June 2022, pp. 6107–6123en_UK
dc.identifier.issn0268-3768
dc.identifier.urihttps://doi.org/10.1007/s00170-022-09081-8
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/17757
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectLaser weldingen_UK
dc.subjectCW and PW modesen_UK
dc.subjectInter-pulse spacingen_UK
dc.subjectWeld shapeen_UK
dc.subjectStainless steelen_UK
dc.titleNew phenomenological model for comparison of lasers with different temporal outputsen_UK
dc.typeArticleen_UK

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