Aerospace & Defense Technology - December 2021 - 16

Lightweight Alloys
complex interior geometries where
post-processing of a surface is limited,
if not impossible. Many of the
applications where you see F357
being used are in high-stress environments-and
a superior surface
finish right out of the printer provides
better corrosion resistance and
fatigue life.
* Hot tearing defects can occur with
F357 because its reduced silicon
content can lead to cracks as it
cools. The most advanced AM systems
have defined parameter sets
KW Micro Power designs and manufactures compact
turbogenerators for high power density
energy generation. They redesigned their aerospace-grade
auxiliary power unit (APU) model for
metal AM, using Aluminum F357, and printed the
component on a VELO3D system, reducing weight
by 44%.
and high-fidelity laser controls that
are specifically tuned to address this
potential problem.
* Humidity can be another issue when
you're printing with aluminum. The
powder is often " stickier " and tends to
clump, especially with " snowplow " recoater
systems. Aluminum powder is
an excellent desiccant, and moisture
will adsorb onto the surface of the particles
immediately. When the humidity
inside the build chamber creeps up,
aluminum powder can be difficult to
spread, and can often lead to buildkilling
powder-bed defects. A non-contact
recoater completely avoids such
problems. Also look for the tightest
build chamber that can maintain extremely
low oxygen and humidity levels,
with active control of both at all
times throughout the build.
The combination of F357 with the
advanced metal AM capabilities now
available provides significant advantages
over AlSi10Mg and legacy metal
AM systems-eliminating engineering
compromises that in the past could
not be avoided and freeing the design
engineer to achieve that desirable mix
of geometric complexity and high
performance at the lightest weights
possible.
This article was written by Zach Murphree,
Vice President Technical Partnerships,
VELO3D (Campbell, CA). For more
information, visit http://info.hotims.
com/79420-502.
16
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Aerospace & Defense Technology - December 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - December 2021

Aerospace & Defense Technology - December 2021 - Intro
Aerospace & Defense Technology - December 2021 - Sponsor
Aerospace & Defense Technology - December 2021 - Cov1
Aerospace & Defense Technology - December 2021 - Cov2
Aerospace & Defense Technology - December 2021 - 1
Aerospace & Defense Technology - December 2021 - 2
Aerospace & Defense Technology - December 2021 - 3
Aerospace & Defense Technology - December 2021 - 4
Aerospace & Defense Technology - December 2021 - 5
Aerospace & Defense Technology - December 2021 - 6
Aerospace & Defense Technology - December 2021 - 7
Aerospace & Defense Technology - December 2021 - 8
Aerospace & Defense Technology - December 2021 - 9
Aerospace & Defense Technology - December 2021 - 10
Aerospace & Defense Technology - December 2021 - 11
Aerospace & Defense Technology - December 2021 - 12
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Aerospace & Defense Technology - December 2021 - 15
Aerospace & Defense Technology - December 2021 - 16
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Aerospace & Defense Technology - December 2021 - 40
Aerospace & Defense Technology - December 2021 - Cov3
Aerospace & Defense Technology - December 2021 - Cov4
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