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Towards real-time monitoring of metal transfer and melt pool temperature field in gas metal arc directed energy deposition

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Abstract

Large three-dimensional metallic parts can be printed layer-by-layer using gas metal arc directed energy deposition (GMA-DED) process at a high deposition rate and with little or no material wastage. Fast responsive real-time monitoring of GMA-DED process signatures and their transient variations is required for printing of dimensionally accurate and structurally sound parts. A systematic experimental investigation is presented here on multi-layer GMA-DED with two different scanning strategies using a high strength low alloy (HSLA) filler wire. The dynamic metal transfer, melt pool temperature field and its longitudinal cross-section, and arc voltage and current are monitored synchronously. The transient arc heat input and the melt pool solidification cooling rate are estimated from the monitored signals. The layer-wise variations of the melt pool dimension, surface temperature profile, thermal cycles, and solidification cooling rate are examined for different scanning strategies. It is comprehended that the part defects can be minimized, and the mass production of zero-defect parts can be achieved in GMA-DED process with synchronized monitoring and assessment of the real-time process signatures.

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Authors and Affiliations

  1. Indian Institute of Technology Bombay, Mumbai, 400076, India

    Prashant Kumar Chaurasia & Amitava De

  2. University of Applied Science, 14770, Brandenburg an der Havel, Germany

    Sven Frithjof Goecke

Authors
  1. Prashant Kumar Chaurasia
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  2. Sven Frithjof Goecke
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  3. Amitava De
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Contributions

P.K.C.: experimentation, analysis, measurements, writing — original draft. S.F.G.: conceptualization, writing — review and editing. A.D.: conceptualization, writing — review and editing.

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Correspondence to Prashant Kumar Chaurasia.

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Chaurasia, P.K., Goecke, S.F. & De, A. Towards real-time monitoring of metal transfer and melt pool temperature field in gas metal arc directed energy deposition. Weld World 67, 1781–1791 (2023). https://doi.org/10.1007/s40194-023-01534-2

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