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Efficient Copper Micro Welding with Fiber Lasers Using Spatial Power Modulation

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Proceedings of the 38th International MATADOR Conference (MATADOR 2015)

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Abstract

Joining of copper material in order to create a contact is an important task in electronics industry. Conventionally pulsed rod-based IR laser sources with low beam quality have a high energy input for welding copper due to large spot diameters. Fiber laser sources have high beam quality which allows small laser spots to be generated. Therefore, the threshold for deep penetration welding can be reached by using lower power. But when such small laser spots are used, the resulting connection area has to be enlarged. To achieve this, spatial power modulation has been introduced. The use of spatial power modulation—a linear feed with superposed circular motion—allows a significant expansion of process boundaries. The additional parameters of oscillation frequency and amplitude enable new strategies to control the laser welding process. This paper presents recent developments concerning process improvements and increase in efficiency by applying spatial power modulation. We discuss process regimes for spatial power modulation by analyzing the melt pool dynamic via high-speed videography. These regimes are an important aspect for process efficiency. Effects of heat conduction and spatial power modulation have been studied.

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Abbreviations

As:

Oscillation amplitude [mm]

f:

Focal length [mm]

fs:

Oscillation frequency [Hz]

P:

Laser power [W]

t:

Time [ms]

U:

Degree of overlap [–]

vf:

Feed rate [mm/s]

Ф:

Total oscillation angle [°]

φ:

Periodical oscillation angle [°]

References

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Acknowledgements

All presented investigations were conducted in the context of the Collaborative Research Centre SFB 1120 project A1 and were funded by Deutsche Forschungsgemeinschaft e. V. (German Research Foundation).

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Authors and Affiliations

  1. Chair for Laser Technology LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany

    A. Haeusler, A. Gillner & R. Poprawe

  2. Fraunhofer Institute for Laser Technology ILT, Steinbachstr. 15, 52074, Aachen, Germany

    B. Mehlmann, A. Olowinsky, A. Gillner & R. Poprawe

Authors
  1. A. Haeusler
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  2. B. Mehlmann
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  3. A. Olowinsky
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  4. A. Gillner
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  5. R. Poprawe
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Corresponding author

Correspondence to A. Haeusler .

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Editors and Affiliations

  1. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK

    Srichand Hinduja

  2. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK

    Paulo Jorge da Silva Bartolo

  3. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK

    Lin Li

  4. Department of Automation Engineering, National Formosa University, Huwei, Yunlin, Taiwan

    Wen-Yuh Jywe

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Haeusler, A., Mehlmann, B., Olowinsky, A., Gillner, A., Poprawe, R. (2022). Efficient Copper Micro Welding with Fiber Lasers Using Spatial Power Modulation. In: Hinduja, S., da Silva Bartolo, P.J., Li, L., Jywe, WY. (eds) Proceedings of the 38th International MATADOR Conference. MATADOR 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-64943-6_15

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  • DOI: https://doi.org/10.1007/978-3-319-64943-6_15

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-64942-9

  • Online ISBN: 978-3-319-64943-6

  • eBook Packages: EngineeringEngineering (R0)

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