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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Peyre, P.
in Cooperation with on an Cooperation-Score of 37%
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Publications (11/11 displayed)
- 2017Laser offset welding of AZ31B magnesium alloy to 316 stainless steelcitations
- 2016Laser offset welding of AZ31B magnesium alloy to 316 stainless steelcitations
- 2012Surface Finish Issues after Direct Metal Deposition
- 2009Direct fabrication of a Ti-47Al-2Cr-2Nb ally by selective laser melting and direct metal deposition processescitations
- 2008Analytical and numerical modelling of the direct metal deposition laser processcitations
- 2008Galvanised steel to aluminium joining by laser and GTAW processes,citations
- 2008Galvanised steel to aluminium joining by laser and GTAW processescitations
- 2007Steel to aluminium joining by laser and TIG reactive wettingcitations
- 2007Generation of aluminum-steel joints with laser-induced reactive wettingcitations
- 2006Which laser process for steel to aluminium joining ?
- 2005Steel to aluminium brazing by laser and TIP processes
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article
Generation of aluminum-steel joints with laser-induced reactive wetting
Abstract
A new mean of assembling steel to aluminiumwas developed, following previouswork by Germanworkers [1]. In this newmethod, a laser-induced aluminium melt pool spreads and wets a solid steel, to generate, after solidification a sound and resistant interface layer. Joint properties were investigated, in terms of surface aspects, interface microstructures and mechanical resistances under tensile testing, for non-galvanized and galvanized DC04 steels. Thermal and diffusional finite element (FE) simulations were also carried out to calculate temperature history at interfaces, and reaction layer thickness. The 2–20 m thick reaction layers formed all along the interface were found to be mostly composed of Fe2Al5 intermetallic compound with a high hardness (1200 HV) and rather low ductility (presence of solidification cracks). The presence of a 10 m thick Zn layer on the steel was shown to have a beneficial influence on the wetting characteristics of the joint, despite the formation of occluded pores in the melt pool due to Zn vaporisation. FE thermal modelling evidenced 760–1020 ◦C wetting temperatures at the interface between DC04 low carbon steel and 6016 aluminium sheets, with time maintains of the melt pool in the 0.2–0.5 s range, resulting in high-speed reaction kinetics. Using these temperature data, diffusion calculations were shown to provide a rather good prediction of intermetallic thicknesses. Tensile tests were considered on aluminium–steel lap joints and evidenced higher mechanical resistances (220 N/mm linear tensile strength) on galvanized steels, provided that fluxing of the steel surfacewas carried out prior to welding to avoid zinc vaporisation. Comparatively, non-galvanized assemblies exhibited much lower mechanical resistances (170 N/mm resulting in a 90MPa interfacial shear strength). It was concluded that the laser-induced wetting technique is a rather effective way for generating Al-steel joints without filler material, and that it should be considered as a competitive technique versus solid assembly modes (friction stir welding . . .).