OCT for Considerably Enhanced Laser Welding Productivity and Decreased Defect Rates

OCT serves for seam tracking, rendering a highly sensitive tool for industry. OCT is an upstream solution for industrial laser welding that enables high process flexibility, productivity, and reliability. OCT adapted to various laser processing optics guarantees precision and reproducibility of welded components. Frequency analysis of the spectral OCT data enables high scanning rates to rapidly confirm processing position.

Mounted directly on the laser head, the OCT scanner enables to scan the workpiece surface with axial resolution of 12 µm.  High axial resolution may be advantageous in some application where exact height position in the focus is required (especially in micro-weldings). It allows miniature welding in the electronics industry or production of medical devices. OCT allows to weld parts with reduced  flange  size.

OCT is a promising tool that can match the process speed and therefore evoke higher performance and production throughput. The coaxial arrangement of the OCT measurement beam and high processing rate in combination  with  an  automatic  closed-loop feed-back  control  makes  it  advantageous  for  remote  or  “on  the  fly”  laser processing applications. Unproductive repositioning time due to processing direction changes can be avoided while using OCT.

 

OCT system helps to detect joint position and geometry prior the welding and to automatically readjust welding position and processing parameters to keep steady laser processing.

 

OCT makes welding in series production faster, more accurate, and thus more cost-effective than currently achievable with today’s conventional sensor technology.

 

Real-Time Close Loop Controlled Seam Tracking with the Tried and Trusted WELDEYE System

The seamless integration of the WELDEYE camera and illumination technology into the processing head allows an accurate real-time determination of the seam joint position, using the reflection principle, particularly during the active welding process. This value is transferred to the processing head for the fast on-line correction of the welding location. The actual laser beam position is adjusted from image to image.

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