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SWIR brings an extra eye on the melt pool

With many advantages of NIT SWIR cameras, such as HDR patented technology, anti-blooming native functions, high frame rate, working with lasers become simpler.  Following the first part of our case study - Additive manufacturing, this time, discover how our SWIR cameras give the ability to bring an extra eye on the melt pool or any similar conditions.  For more information, visit us: http://new-imaging-technologies.com Or contact us: info@new-imaging-technologies.com Follow on LinkedIn: https://www.linkedin.com/company/new-imaging-technologies Follow on Twitter: https://twitter.com/NewImaging_Tech Watch our products demos: https://www.youtube.com/user/NewImagingTechnoNIT

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Whether it is on the bed powder, or with a powder deposed, the Meltpool caused by the laser
source is the heart of SLS/DED processes.
The physics reactions occurring in the Meltpool will define how good will be the manufactu-
ring. Passing from an un-melted powder to a fully dense solid metal in a very short time (e.g:
Speed of typical SLM could be from between 1m/s to 10m/s. This is much faster compared to a
traditional welding manufacturing process where speed is in the range of 2m/min) will imply a
significant energy transfer on a very small area <mm².
This Energy density, with the high-speed scanning rate, leads to a rapid heating, melting, followed
by a shrinkage, causing a significant temperature gradient that could be up to 1 000 000°C / sec.
As a consequence, the melt pool geometry and shape will influence the grain, growth and the
microstructure of the part. Residual stress and deformation may find their birth in an un-proper
“meltpool”.
Meltpool,
where the action happens.
www.new-imaging-technologies.com
Most of existing additive laser manufacturing
technics and machine rely on the understanding
of all the physics involved to optimize the process
results.
However, having additional “imaging” information
or analysis on the meltpool during the operation
may lead to a really valuable information for pro-
cess optimization and in-line quality control.
Thanks to its High Dynamic Range in the SWIR
band and its fast frame rate with ROI, the WiDy
SenS camera is able to acquire all relevant infor-
mation’s of the Meltpool: the true shape and geo-
metry of the Meltpool without blooming effect,
the temperature gradient and flow dynamics gi-
ving key information on the transformation reac-
tions, and even visualization of the ‘sparks’ ejec-
tion (hot droplets) in the surface responsible also
for defects in the structure.
The WiDy SWIR gives the ability to bring an
extra eye on the meltpool
Taking the speed with high frame rate in windowing mode for such a high-speed processing, is
also a benefit of the WiDy SWIR family.
For a seamless integration with new additive manufacturing machinery, the WiDy SenS sent out
the live data through CameraLink Interface. A Real time analysis or post processing analysis are
easily possible thanks to its standard protocol interface and adequate Images processing.
www.new-imaging-technologies.com
The 5 reasons why...
To summarize why the WiDY SWIR camera is the perfect allied for Additive manu-
facturing analysis, control and process optimization, we end our episode with the “5
reasons why” list below:
1.	 WiDy SWIR spectral band offers response in the 900nm-1.7μm where most of the
laser used in SLS/SLM/LMD/DED are.
2.	 The unique HDR capability in the SWIR band gives clear images of the Melt-pool
thermal energy and a visual definition of the Temperature gradient.
3.	 The WiDy SWIR can operate up to Several Hundred Frame/sec in windowing mode
(e.g: 128 x 128 fps) making possible the capture of fast additive manufacturing
processes without losing the details of ejected droplet around the melt-pools.
4.	 The WiDy SWIR antiblooming native function allows a sharp visualization of the
Melt-pool shape and geometry without false measurement.
5.	 The CameraLink standard interface of the WiDy SWIR can easily be integrated into
additive manufacturing machinery
www.new-imaging-technologies.com

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SWIR brings an extra eye on the melt pool

  • 1. Whether it is on the bed powder, or with a powder deposed, the Meltpool caused by the laser source is the heart of SLS/DED processes. The physics reactions occurring in the Meltpool will define how good will be the manufactu- ring. Passing from an un-melted powder to a fully dense solid metal in a very short time (e.g: Speed of typical SLM could be from between 1m/s to 10m/s. This is much faster compared to a traditional welding manufacturing process where speed is in the range of 2m/min) will imply a significant energy transfer on a very small area <mm². This Energy density, with the high-speed scanning rate, leads to a rapid heating, melting, followed by a shrinkage, causing a significant temperature gradient that could be up to 1 000 000°C / sec. As a consequence, the melt pool geometry and shape will influence the grain, growth and the microstructure of the part. Residual stress and deformation may find their birth in an un-proper “meltpool”. Meltpool, where the action happens. www.new-imaging-technologies.com
  • 2. Most of existing additive laser manufacturing technics and machine rely on the understanding of all the physics involved to optimize the process results. However, having additional “imaging” information or analysis on the meltpool during the operation may lead to a really valuable information for pro- cess optimization and in-line quality control. Thanks to its High Dynamic Range in the SWIR band and its fast frame rate with ROI, the WiDy SenS camera is able to acquire all relevant infor- mation’s of the Meltpool: the true shape and geo- metry of the Meltpool without blooming effect, the temperature gradient and flow dynamics gi- ving key information on the transformation reac- tions, and even visualization of the ‘sparks’ ejec- tion (hot droplets) in the surface responsible also for defects in the structure. The WiDy SWIR gives the ability to bring an extra eye on the meltpool Taking the speed with high frame rate in windowing mode for such a high-speed processing, is also a benefit of the WiDy SWIR family. For a seamless integration with new additive manufacturing machinery, the WiDy SenS sent out the live data through CameraLink Interface. A Real time analysis or post processing analysis are easily possible thanks to its standard protocol interface and adequate Images processing. www.new-imaging-technologies.com
  • 3. The 5 reasons why... To summarize why the WiDY SWIR camera is the perfect allied for Additive manu- facturing analysis, control and process optimization, we end our episode with the “5 reasons why” list below: 1. WiDy SWIR spectral band offers response in the 900nm-1.7μm where most of the laser used in SLS/SLM/LMD/DED are. 2. The unique HDR capability in the SWIR band gives clear images of the Melt-pool thermal energy and a visual definition of the Temperature gradient. 3. The WiDy SWIR can operate up to Several Hundred Frame/sec in windowing mode (e.g: 128 x 128 fps) making possible the capture of fast additive manufacturing processes without losing the details of ejected droplet around the melt-pools. 4. The WiDy SWIR antiblooming native function allows a sharp visualization of the Melt-pool shape and geometry without false measurement. 5. The CameraLink standard interface of the WiDy SWIR can easily be integrated into additive manufacturing machinery www.new-imaging-technologies.com