Visualization of Gas Flow in a Multilayer CMT Process (Slow Motion)

This video shows a CMT process adding a new layer to a structure. CMT is shortened from Cold Metal Transfer, a technique developed by Fronius Welding of Austria, and it is often used in additive manufacturing like in this video. CMT is often preferred over other arc processes for 3D metal printing because of the smaller heat input of the process. But even though CMT carries the term cold in its name, there is still a significant amount of thermal heat and brightness generated by the process, which means you can't see through it.

In this video, however, you can see everything clearly without the thermal brightness of the process. The video was taken with a high-speed camera and CAVILUX laser illumination. Illumination is applied from front to see the details of the core process. In addition, the system is placed in a Schlieren imaging setup to visualize the flow of the shielding gas. CAVILUX laser illumination with short pulses is used as light source also for the Schlieren setup. This provides high quality images without motion blur.

Used filler material is a Ni-based superalloy solid wire.

Video was taken in cooperation with LAL - Laser Application Laboratory of Tampere University (former Tampere University of Technology).

Used camera: Phantom v2640 provided by Citius Imaging Ltd.

Read more about CAVILUX laser illumination: https://products.cavitar.com/Laser-Il...

Read more about Schlieren imaging: https://applications.cavitar.com/schl...

See more videos and other related material: https://applications.cavitar.com/library

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