SAE Update - September 2021 - 16

FOCUS: ADVANCED
MANUFACTURING
Order of operations in
metal additive manufacturing
get plated, and similar
operations. By doing this,
the lot acceptance results
are known as soon as
possible to prevent adding
further value to parts that
may be scrapped due to
discrepant mechanical
properties, chemistry, or
microstructure.
11. Media Finishing and
Surface Smoothing -
When a smooth surface is
required for a good
volumetric nondestructive
testing (NDT), such as
ultrasonic inspection, this
operation would be
performed next. This can
also include removal
crowns or pre-machining of
the sides of DED parts
made with a process with a
large melt pool.
12. Volumetric NDT - Like lot
acceptance testing, it is
desirable to perform this as
early as possible to prevent
adding value to a part that
will be scrapped. It winds
up later in the flow,
however, since HIP is used
to remove internal
discontinuities, and some
forms of heat treatment can
result in quench cracking.
16
September 2021
Laser/powder DED engine case
13. Machining - This is done as late as possible, as it
is desirable to perform it after as many
inspections and all potential distortion-inducing
processes are complete.
14. Surface NDT - Generally penetrant inspection,
but sometimes magnetic particle or eddy-current
testing, this falls after machining since machined
surfaces often require this inspection, and since
etching (which is done in a chemical treating
cell) is required for many applications. If nonmachined
surfaces are to be inspected, it needs
to be done after surface smoothing to prevent
false positive indications.
15. Corrosion Protection & Paint - Often the final
value-added process, this is performed at the
end when all the surfaces to be treated have had
all other operations performed on them.
16. Dimensional Inspection - In some cases,
portions of this may be done earlier to find
discrepant geometries as soon as possible. If
UPDATE
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SAE Update - September 2021

Table of Contents for the Digital Edition of SAE Update - September 2021

SAE Update - September 2021 - Cov1
SAE Update - September 2021 - Cov2
SAE Update - September 2021 - 1
SAE Update - September 2021 - 2
SAE Update - September 2021 - 3
SAE Update - September 2021 - 4
SAE Update - September 2021 - 5
SAE Update - September 2021 - 6
SAE Update - September 2021 - 7
SAE Update - September 2021 - 8
SAE Update - September 2021 - 9
SAE Update - September 2021 - 10
SAE Update - September 2021 - 11
SAE Update - September 2021 - 12
SAE Update - September 2021 - 13
SAE Update - September 2021 - 14
SAE Update - September 2021 - 15
SAE Update - September 2021 - 16
SAE Update - September 2021 - 17
SAE Update - September 2021 - 18
SAE Update - September 2021 - 19
SAE Update - September 2021 - 20
SAE Update - September 2021 - 21
SAE Update - September 2021 - 22
SAE Update - September 2021 - 23
SAE Update - September 2021 - 24
SAE Update - September 2021 - 25
SAE Update - September 2021 - 26
SAE Update - September 2021 - 27
SAE Update - September 2021 - 28
SAE Update - September 2021 - 29
SAE Update - September 2021 - 30
SAE Update - September 2021 - 31
SAE Update - September 2021 - 32
SAE Update - September 2021 - 33
SAE Update - September 2021 - 34
SAE Update - September 2021 - 35
SAE Update - September 2021 - 36
SAE Update - September 2021 - 37
SAE Update - September 2021 - 38
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