An experimental-numerical study of active cooling in wire arc additive manufacturing
作者： William Hackenhaar , José A.E. Mazzaferro , Filippo Montevecchi , Gianni Campatelli
DOI: 10.1016/J.JMAPRO.2020.01.051
关键词: Materials science 、 Arc (geometry) 、 Convective heat transfer 、 Substrate (building) 、 Internal energy 、 Gas metal arc welding 、 Active cooling 、 Composite material 、 Process simulation 、 Natural convection
摘要: Abstract Wire arc additive manufacturing (WAAM) is a metal process based on gas welding and it known to be economically convenient for large parts with low complexity. The main issue WAAM the sensibility heat accumulation, i.e., progressive increase in internal energy of workpiece due high input deposition process, that responsible excessive remelting lower layers related change bead geometry. A promising technique mitigate such use an air jet impinging deposited material rate convective transfer. This paper presents analysis impingement performances by means hybrid numerical-experimental approach. Different samples are manufactured using AWS ER70S-6 as filler material, cooling approaches free convection impingement, different interlayer idle times. measurement substrate temperatures has been used validate simulation, obtaining temperature field whole part. results indicate significant impact limiting compared cooling. From arise optimal time 30 s, compromise between productivity reduction independently from strategy.
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