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Contact-less temperature measurement and control with applications to laser cladding

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Abstract

In material processing, heat input into parts is a major issue. To reduce heat impact, temperatures can be evaluated to optimize processes, i.e., for low distortion, low dilution, or small heat-affected zones. A new sensor, which combines ratio pyrometry with 2D-resolved measurement, is presented and compared to existing temperature sensors in the context of laser processing. The advantages of independence of emissivity and attenuation of the thermal radiation together with 2D temperature information are demonstrated on laser cladding. The temperature distribution at the parts’ surfaces becomes available quantitatively and with high precision. This information was successfully applied to determine melt pool diameters, latent heat, as well as to validate FEM-based temperature field simulations.

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Acknowledgments

The authors acknowledge funding by the Deutsche Forschungsgemeinschaft DFG for funding the project VO 530/31 “Laserstrahlbeschichten und Simulation der Temperatur- und Eigenspannungssituation” (Laser cladding and simulation of temperature and residual stress situation).

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Authors and Affiliations

  1. BIAS – Bremer Institut für angewandte Strahltechnik GmbH, Klagenfurter Str. 2, 28359, Bremen, Germany

    H. Köhler, C. Thomy & F. Vollertsen

  2. University of Bremen, Bibliothekstraße 1, 28359, Bremen, Germany

    F. Vollertsen

Authors
  1. H. Köhler
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  2. C. Thomy
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  3. F. Vollertsen
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Correspondence to H. Köhler.

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Recommended for publication by Commission IV --- Power Beam Processes

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Köhler, H., Thomy, C. & Vollertsen, F. Contact-less temperature measurement and control with applications to laser cladding. Weld World 60, 1–9 (2016). https://doi.org/10.1007/s40194-015-0275-7

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  • DOI: https://doi.org/10.1007/s40194-015-0275-7

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