研究目的
To reveal the interaction between the laser beam and the keyhole front wall (KFW) during fiber laser keyhole welding.
研究成果
The keyhole formation is the result of periodical drilling of the laser beam spot center on the KFW during welding. The average drilling speed can be increased by increasing the line energy or power density of the laser. The next drilling period starts before the drilling speed reduces to 0 m s?1.
研究不足
The study focuses on the interaction between the laser beam and the KFW during fiber laser welding, but does not extensively explore the effects of other welding parameters or materials.
1：Experimental Design and Method Selection:
A fiber laser was used to weld a ‘sandwich’ sample made by closely fitting polished mild steel with a GG17 glass of the same size. The laser beam was perpendicular to the upper surface of the ‘sandwich’ sample. A high-speed camera equipped with a neutral attenuator was used to observe the dynamic process of the keyhole from the glass side.
2：Sample Selection and Data Sources:
The sample was a ‘sandwich’ specimen made of mild steel and GG17 glass. The high-speed camera captured images of the keyhole formation process.
3：List of Experimental Equipment and Materials:
IPG YLS-6000 fiber laser, PHOTRON Fastcam 1024R2 high-speed camera, neutral attenuator with a transmittance of 10%, argon gas for protection.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused on the ‘sandwich’ sample, and the high-speed camera recorded the keyhole formation process at a frame rate of 1 × 104 frames s?
5：Data Analysis Methods:
The depth and speed of the bright spot on the KFW were measured from the high-speed camera images to analyze the dynamic interaction between the laser beam and the KFW.
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