研究目的
Investigating the capability and restrictions of using optical coherence tomography (OCT) for online measurement of capillary depth in laser beam welding.
研究成果
The OCT sensor for capillary depth measurement works robustly and reliably when correctly aligned, matching the penetration depth determined by cross-sections up to a few percent. However, its performance is compromised with deep and bent capillaries or wide and shallow capillaries. The method has a wide range of applications but requires careful alignment and may need more sophisticated data processing to extend its usability.
研究不足
The method reaches its limits with deep and bent capillaries or wide and shallow capillaries, where the probe light does not reach the capillary bottom or multiple reflections occur, respectively. The alignment of the probe beam is critical and may not be optimal for all welding directions or conditions.
1：Experimental Design and Method Selection:
The study uses optical coherence tomography (OCT) for capillary depth measurement during laser beam welding. The method involves a Michelson-type interferometer with a broadband light source and a line camera detector.
2：Sample Selection and Data Sources:
Experiments were conducted on mild steel with variations in laser power, feed rate, and welding spot diameter to assess the method's performance under different conditions.
3：List of Experimental Equipment and Materials:
TRUMPF TruDisk 16002 thin-disk laser, Precitec IDM (In-process Depth Meter) system, BEO D70 welding optics, and mild steel work pieces.
4：Experimental Procedures and Operational Workflow:
The OCT sensor was aligned with the welding optics, and capillary depth measurements were taken during welding. Data was processed using Fast Fourier Transformation (FFT) and histogram analysis to determine capillary depth.
5：Data Analysis Methods:
The interference signal from the line detector was evaluated using FFT to determine the optical path difference, and histogram analysis was used to statistically evaluate the capillary depth.
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