LDD Weld Monitoring

Laser Depth Dynamics’ (LDD) patented imaging technique is the only technology that delivers direct, geometric measurements of laser weld penetration – during the weld. Inline Coherent Imaging, or ICI, uses a low-power IR laser beam to gauge distances. This measurement beam is fired through the same optics as the welding beam, getting right to the bottom of the vapor channel and returning the actual penetration in real time. The resulting data is equivalent to a lengthwise section of the weld, delivered instantly, with no additional labor and without destroying the part.

ICI is flexible, with applications in a range of laser processes beyond welding, and the ability to measure a growing number of process-specific metrics. ICI-based seam tracking, height following, and surface inspection are just a few examples.


The LD-600 is LDD’s flagship inline coherent imaging system. This instrument, when combined with a 3D Module, offers the full range of ICI capabilities.

Capable of seeing through the blinding process beam and plasma, the LD-600 can image the interaction region of your laser process with a sampling rate up to 300 kHz.

Whether you need real-time laser depth measurement and feedback, instant weld QC metrics, hundred-megapixel images of your process dynamics at tens-of-microns resolution, through-the-lens autofocus and seam tracking, or more, the LD-600 can do it all.


Inline coherent imaging (ICI) is the ideal process monitoring and control technology for laser welding, drilling and ablation. ICI yields unprecedented images of the interaction region in a wide variety of laser processing applications. Laser Depth Dynamics instruments are completely immune to blinding by the process beam, plasma or other sources. LDD’s systems can deliver high-resolution, high-speed depth images of the entire process region, including the inside of the keyhole. On-line image analysis is possible, along with the ability to provide real-time feedback control of height, laser power and more.

3D Module

The 3D Module head interface enables the LD-600 to steer the imaging beam in real time. It is compact and lightweight, often taking up no more space than the inline camera it replaces.

  • Easy on-line alignment
  • 3D imaging through the laser head optics
  • Surface height compensation simultaneous with other imaging modes
  • Seam tracking
  • Measurement of the regions around the process beam (keyhole profiling, melt pool dynamics, etc.)
  • Live 3D viewing (replaces an inline video camera)
  • Surface profile & point cloud image export to standard spreadsheet & CAD formats

Laser Depth Dynamics’ OmniWELD is the most comprehensive laser weld monitoring solution on the market. OmniWELD combines four different ICI measurement modes (seam position, workpiece height, keyhole depth and weld surface) into a single simultaneous monitoring operation. The result is a single-instrument process monitoring suite that offers unprecedented versatility while allowing rapid customization. A single LD-600 running in OmniWELD mode can replace multiple existing measurement technologies and provide LDD’s industry-first penetration monitoring – at the same time.

LDD’s multi-factor monitoring seeks out defects before, during, and after the weld process. The exact combination of pass/fail and control for each measurement stream is rapidly configured in software. You can create a tailored monitoring scheme for your process that has all the information you want, and none that you don’t.



Data Sheet