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Impact of Melt Flow and Surface Tension on Gap Bridging During Laser Beam Welding
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0003-0194-9018
2024 (English)In: Lasers in Manufacturing and Materials Processing, ISSN 2196-7229, Vol. 11, p. 25-36Article in journal (Refereed) Published
Abstract [en]

Laser beam welding is an essential technology to enable the transformation to enforce e-mobility. When manufacturing light weight structures like the chassis, precision, speed, quality and low deformation can be expected when using the laser beam as a welding heat source. However, the laser beam is typically used at small dimensions and can fail to transfer its energy to the joining partners when the gap between them becomes large. Beam shaping technologies have developed in the last years to be flexibly used for high-power processes and provide an opportunity to alter the energy input and thereby improve the welding quality and gap bridgability. In this work, multi-spot beam shaping was analyzed using up to nine spots. Experiments were performed using different beam shapes in order to redistribute the energy input, recording the process using high-speed imaging for detection of melt pool dimensions. Those were used as input for a simplified analytical model predicting the process collapse based on the available melt material. Several beam shapes created melt pools that support the material availability behind the keyhole(s). Numerical simulations showed that directed melt flows induced by the keyhole(s) can increase the gap bridgability.

Place, publisher, year, edition, pages
Springer, 2024. Vol. 11, p. 25-36
Keywords [en]
Fluid Flow, Gap Bridging, Keyhole Welding, Modelling, Simulation
National Category
Manufacturing, Surface and Joining Technology Other Mechanical Engineering
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-99267DOI: 10.1007/s40516-023-00222-9Scopus ID: 2-s2.0-85165887356OAI: oai:DiVA.org:ltu-99267DiVA, id: diva2:1786070
Funder
Swedish Research Council, 2020–04250
Note

Godkänd;2024;Nivå 0;2024-04-09 (sofila);

Funding: EC Research Fund for Coaland Steel, RFCS, (800726)

Godkänd;2024;Nivå 0;2024-04-09 (sofila);Funding: EC Research Fund for Coaland Steel, RFCS, (800726)

Available from: 2023-08-07 Created: 2023-08-07 Last updated: 2024-04-09Bibliographically approved

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Volpp, Joerg

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