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
Dong, Hongbiao
Mirihanage, Wajira U.
Tong, Mingming
Browne, David J.
et al.
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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 manufacturingMelt pool flow dynamicsSynchrotron radiation experimentFlow 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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