Revealing internal flow behaviour in arc welding and additive manufacturing of metals
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|Title:||Revealing internal flow behaviour in arc welding and additive manufacturing of metals||Authors:||Aucott, Lee
Mirihanage, Wajira U.
Browne, David J.
|Permanent link:||http://hdl.handle.net/10197/10675||Date:||21-Dec-2018||Online since:||2019-05-28T07:10:22Z||Abstract:||Internal flow behaviour during melt-pool-based metal manufacturing remains unclear and hinders progression to process optimisation. In this contribution, we present direct time-resolved imaging of melt pool flow dynamics from a high-energy synchrotron radiation experiment. We track internal flow streams during arc welding of steel and measure instantaneous flow velocities ranging from 0.1 m s-1 to 0.5 m s-1. When the temperature-dependent surface tension coefficient is negative, bulk turbulence is the main flow mechanism and the critical velocity for surface turbulence is below the limits identified in previous theoretical studies. When the alloy exhibits a positive temperature-dependent surface tension coefficient, surface turbulence occurs and derisory oxides can be entrapped within the subsequent solid as result of higher flow velocities. The widely used arc welding and the emerging arc additive manufacturing routes can be optimised by controlling internal melt flow through adjusting surface active elements.||Funding Details:||European Commission - Seventh Framework Programme (FP7)||Type of material:||Journal Article||Publisher:||Springer Nature||Journal:||Nature communications||Volume:||9||Issue:||Article 5414||Start page:||1||End page:||7||Copyright (published version):||2018 the Authors||Keywords:||Metal manufacturing; Melt pool flow dynamics; Synchrotron radiation experiment; Flow velocities||DOI:||10.1038/s41467-018-07900-9||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Mechanical & Materials Engineering Research Collection|
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