COAXIAL WIRE FEED FOR LASER METAL DEPOSITION Subject to ... · Subject to alterations in...
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64 Annual Report 2016 Subject to alterations in specifications and other technical information. 06/2017. Fraunhofer Institute for Laser Technology ILT, www.ilt.fraunhofer.de DQS certified by DIN EN ISO 9001, Reg.-No.: DE-69572-01 1 1 Machining head with coaxial wire feed. 2 Schematic representation of the beam paths. Task Laser metal deposition (LMD) with wire-shaped filler material is an alternative to LMD with powdered filler materials. Indeed, the overspray, the catchment efficiency, the insufficient quality of the powder, or the contamination of the component and the system are factors that make powder-based LMD unfeasible for some applications. A disadvantage of the state- of-the-art wire processing heads, however, is the lateral feed, which makes direction-independent processing impossible. Exceptions are the coaxial designs developed at Fraunhofer IWS and ILT, which permit a direction-independent processing but are only of limited suitability for applications on robotic systems due to their size. The two institutes will continue to develop, therefore, a smaller and more compact machining head with a system weight of about 5 kg for LMD. Here, a coaxial wire feed shall enable direction-independent 3D processing. Method Before a compact processing head can be developed, the process for the generation of a ring beam, patented by Fraun- hofer ILT, has to be revised. The use of reflective optics not only enables the plant size to be reduced, but also allows the processing head to operate independently of the wavelength. In addition to adding laser beam guiding and shaping, the institutes have integrated a coaxial process monitoring system into the machining head. Results A machining head has been developed for LMD with coaxial wire feed; it weighs approx. 5 kg and has a size of 200 x 100 x 200 mm 3 (W x D x H). During the testing of the processing head, a direction-independent LMD process could be verified, which was demonstrated by using the system to weld Ti6242. The integrated coaxial process monitoring was used to precisely position the machining head. Applications The processing head developed here can be used for LMD with wire-shaped filler materials for coating, repair and additive manufacture. The system weight and size allow use in systems with low load capacity and/or high dynamics. Contact Jana Kelbassa M.Sc. Telephone +49 241 8906-8331 [email protected] Dr. Oliver Pütsch Telephone +49 241 8906-617 [email protected] COAXIAL WIRE FEED FOR LASER METAL DEPOSITION 2
Transcript of COAXIAL WIRE FEED FOR LASER METAL DEPOSITION Subject to ... · Subject to alterations in...
64 Annual Report 2016 Annual Report 2016 65
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ject
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alt
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s in
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cati
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Fraunhofer Institute for Laser Technology ILT, www.ilt.fraunhofer.de
DQS certified by DIN EN ISO 9001, Reg.-No.: DE-69572-01
Fraunhofer Institute for Laser Technology ILT, www.ilt.fraunhofer.de
DQS certified by DIN EN ISO 9001, Reg.-No.: DE-69572-01
Sub
ject
to
alt
erat
ion
s in
sp
ecifi
cati
on
s an
d o
ther
tec
hn
ical
info
rmat
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. 06/
2017
.
1
1 Machining head with coaxial wire feed.
2 Schematic representation of the beam paths.
Task
Laser metal deposition (LMD) with wire-shaped filler material is
an alternative to LMD with powdered filler materials. Indeed,
the overspray, the catchment efficiency, the insufficient quality
of the powder, or the contamination of the component
and the system are factors that make powder-based LMD
unfeasible for some applications. A disadvantage of the state-
of-the-art wire processing heads, however, is the lateral feed,
which makes direction-independent processing impossible.
Exceptions are the coaxial designs developed at Fraunhofer
IWS and ILT, which permit a direction-independent processing
but are only of limited suitability for applications on robotic
systems due to their size. The two institutes will continue to
develop, therefore, a smaller and more compact machining
head with a system weight of about 5 kg for LMD. Here,
a coaxial wire feed shall enable direction-independent 3D
processing.
Method
Before a compact processing head can be developed, the
process for the generation of a ring beam, patented by Fraun-
hofer ILT, has to be revised. The use of reflective optics not
only enables the plant size to be reduced, but also allows the
processing head to operate independently of the wavelength.
In addition to adding laser beam guiding and shaping, the
institutes have integrated a coaxial process monitoring system
into the machining head.
Results
A machining head has been developed for LMD with coaxial
wire feed; it weighs approx. 5 kg and has a size of 200 x 100
x 200 mm3 (W x D x H). During the testing of the processing
head, a direction-independent LMD process could be verified,
which was demonstrated by using the system to weld Ti6242.
The integrated coaxial process monitoring was used to precisely
position the machining head.
Applications
The processing head developed here can be used for LMD
with wire-shaped filler materials for coating, repair and
additive manufacture. The system weight and size allow use
in systems with low load capacity and/or high dynamics.
Contact
Jana Kelbassa M.Sc.
Telephone +49 241 8906-8331
Dr. Oliver Pütsch
Telephone +49 241 8906-617
COAXIAL WIRE FEED FOR LASER METAL DEPOSITION
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