11èmes
Assises Européennes de Prototypage Rapide
Session
1
Multiple-layer deposition by
coaxial laser micro-cladding -- Processing on titanium
alloys powders
by S. Sankare (1),
D. Boisselier (1),
F. Machi (1)
T. Engel (2),
F. Hlawka (2)
1) IREPA LASER - 2) INSA Strasbourg
db@irepa.u-strasbg.fr
http://www.insa-strasbourg.fr
Abstract: The coaxial laser
micro-cladding consists in the deposition of melted
powders in a melt pool in order to build a 3D structure
or to cover a small surface with new properties.
The filler material powder is injected coaxially
into a laser beam. Thus the energy input is partly
used to melt the filler material but also to melt
a fine layer of the substrate. This coaxial configuration
allows a omnidirectional processing of low size
structures implementing layer by layer building.
In order to guarantee the efficiency
of the process and the quality of the deposit a
simplified modelling of the process was carried
out. First, a finite elements analysis of the powder
stream was realised to determine the nozzle geometry.
Afterwards a thermal modelling of the interaction
between the powder stream and the laser beam was
performed .
Based on these results, a micro-cladding
nozzle has been designed, derived from the initial
patented nozzle of IREPA LASER. This new nozzle
has been validated with a fiber laser by performing
thin walls, which proved the good deposition efficiency,
even with a reduced power of 80W.
This study has shown the feasibility
of the process for a regular 600 µm width
wall and the influences of the parameters on the
deposit characteristics. This process is very promising
for manufacturing or functional prototyping of small
accurate parts.
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