研究目的
To reveal the fluctuation mechanism of the plume induced during fiber laser keyhole welding and to understand the correlation between plume fluctuations and keyhole dynamics.
研究成果
The fluctuation of the plume is caused by the oscillation of the keyhole, specifically the periodic drilling of the laser spot on the KFW. The stability of the fiber laser welding process can be further improved by utilizing the dynamic characteristics of the plume/keyhole.
研究不足
The study focuses on the correlation between plume fluctuations and keyhole dynamics during fiber laser keyhole welding, but the direct observation of both the plume and the keyhole simultaneously is challenging. The research is limited to specific materials and welding parameters.
1：Experimental Design and Method Selection:
The study used a multiple-imaging method to simultaneously observe the dynamic behaviors of the plume and the keyhole during fiber laser keyhole welding.
2：Sample Selection and Data Sources:
Low carbon steel and GG17 glass were used to form a 'sandwich' specimen for welding.
3：List of Experimental Equipment and Materials:
An unpolarized IPG YLS-6000 fiber laser and a PHOTRON Fastcam Mini UX100 color high-speed camera equipped with multiple-imaging lenses were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was perpendicular to the border line of two materials, and the frame rate of the high-speed camera was 10,000 frames/s.
5：Data Analysis Methods:
The inclination angle of the plume and the depth of the bright spot on the KFW were measured to analyze their fluctuation characteristics.
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