Schlieren Imaging of Welding GMAW with Front Illumination

schlieren of TIG welding

Imaging the flow of protective gases in arc welding is challenging. With the Schlieren imaging method and our CAVILUX illumination laser one gets a clear view of the gas flow. Adding front illumination to the setup increases the amount of information obtained from the process significantly and one can study for example melt pool behavior and drop forming in applications like GMAW or TIG welding while seeing the gas flow. Read more about Schlieren imaging technique.

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Welding Industry

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Welding processes typically emit very bright light that “blinds” the eye as well as machine vision camera systems. Without proper means the visual monitoring of a welding process is impossible.

Cavitar’s laser illumination enables the clear visualization of welding processes without any disturbances as if the process were cold. Our technology can be applied to all major arc welding processes such as GMAW (MIG, MAG) and TIG, as well as to all major beam welding processes including CO2 laser, fiber laser, diode laser, Nd:YAG laser and electron beam sources. In many cases we can also utilize structured laser illumination and provide information about seam or gap topography.

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  • Process observation from a safe distance and in an ergonomic manner
  • Welders can adjust the process in real-time based on the accurate live view
  • Images can be used for image analysis and automation
  • Images or videos can be stored for quality documentation

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  • Our laser illumination provides dramatically improved performance as compared e.g. to LED, flash lamp or halogen illumination
  • The illumination is highly uniform and bright which results in high-quality images with low speckle content and no motion blur
  • Our illumination is compatible with all high and low speed cameras that enable synchronization

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TIG welding of aluminium

TIG Welding

Visualization of 5.5 kW TIG welding of aluminum with Cavitar’s CAVILUX illumination laser reveals a clear view to the behavior of melt pool and additive material. Video taken at 20 frames per second – front illumination.

In cooperation with Lappeenranta University of Technology (LUT).

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MIG welding of steel

MIG welding drop forming

Visualization of MIG arc welding with Cavitar’s CAVILUX illumination laser – front illumination. Video taken at 5.000 frames per second.

In co-operation with ESAB Sverige AB and Prosolv AB.

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