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Focus control system for laser welding.

F M Haran, D P Hand, C Peters

    Applied Optics
    |July 20, 1997
    PubMed
    Summary
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    A new focus control system for neodymium-doped yttrium aluminum garnet (Nd:YAG) laser welding uses an optical sensor to detect process light. This system corrects focal errors caused by chromatic aberrations, enabling precise welds in various metal alloys.

    Area of Science:

    • Materials Science and Engineering
    • Optical Engineering
    • Manufacturing Technology

    Background:

    • Nd:YAG laser welding is a critical manufacturing process.
    • Maintaining precise focal control is essential for weld quality.
    • Chromatic aberrations in optical delivery systems can cause focal errors.

    Purpose of the Study:

    • To develop and demonstrate a focus control system for Nd:YAG laser welding.
    • To address focal errors arising from chromatic aberrations.
    • To validate the system's performance across different materials and laser modes.

    Main Methods:

    • An optical sensor was integrated into the fiber delivery system to capture process-emitted light.
    • Broadband light was separated into two distinct wavelength bands.

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  • Electronic processing of the wavelength bands generated a signal proportional to focal error.

    • Main Results:

    • The focus control system effectively detected and compensated for focal errors.
    • Successful bead-on-plate welds were achieved on titanium alloy, aluminum alloy, mild steel, and stainless steel.
    • The system demonstrated efficacy with both pulsed and continuous laser radiation.

    Conclusions:

    • The developed focus control system provides a viable solution for maintaining optimal focal conditions in Nd:YAG laser welding.
    • The system's ability to correct for chromatic aberrations enhances weld consistency and quality across diverse materials.
    • This technology is applicable to a wide range of laser welding applications using different laser modes.