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Impact of Melt Flow and Surface Tension on Gap Bridging During Laser Beam Welding
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0003-0194-9018
2024 (engelsk)Inngår i: Lasers in Manufacturing and Materials Processing, ISSN 2196-7229, Vol. 11, s. 25-36Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Springer, 2024. Vol. 11, s. 25-36
Emneord [en]
Fluid Flow, Gap Bridging, Keyhole Welding, Modelling, Simulation
HSV kategori
Forskningsprogram
Produktionsutveckling
Identifikatorer
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
Forskningsfinansiär
Swedish Research Council, 2020–04250
Merknad

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)

Tilgjengelig fra: 2023-08-07 Laget: 2023-08-07 Sist oppdatert: 2024-04-09bibliografisk kontrollert

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