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    This study introduces a multi-focused laser beam for stable laser welding, significantly reducing defects like porosity and spattering in Q235 mild steel. Rotating the laser focal point further enhances process stability and weld quality.

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    Area of Science:

    • Materials Science
    • Manufacturing Engineering
    • Laser Technology

    Background:

    • Laser welding is crucial for manufacturing but faces challenges with process stability and defects.
    • Porosity and spattering are common welding defects that compromise material integrity.

    Purpose of the Study:

    • To enhance laser welding stability and minimize defects using a novel multi-laser beam focusing system.
    • To investigate the impact of multi-focused laser beams and focal point rotation on weld quality.

    Main Methods:

    • Development of a multi-laser beam focusing system utilizing a reflective splitting mirror.
    • Experimental validation of the system on Q235 mild steel.
    • Analysis of defect reduction (porosity, spattering) with increasing focal points and focal point rotation.

    Main Results:

    • Increasing the number of laser focal points effectively reduced porosity and spattering.
    • The multi-focused laser beam approach significantly improved laser welding process stability.
    • Rotation of the laser focal point further decreased welding defects.

    Conclusions:

    • The developed multi-focused laser beam system offers a viable solution for stable and defect-free laser welding.
    • This technology holds potential for improving the quality and reliability of welded components.