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An online surface height measurement method for GTAW-based additive manufacturing

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Abstract

Wire and arc additive manufacturing (WAAM) process control is critical to forming dimensional accuracy. The online surface height measurement technology is one of the key technologies to achieve closed-loop control of the WAAM surface height. Measurement equipment such as charge-coupled device (CCD) or infrared cameras have difficulties in meeting the requirements for high-frequency online layer height measurement of multi-directional complex paths. In this paper, an online surface height measurement model (OSHMM) based on welding current, voltage, arc length signal, and motion system height displacement data is proposed that can measure the height value of the surface just below the tungsten electrode. The influence of large surface height deviation and the change of wire-feed rate, corner, and inclined edge on measurement accuracy were analysed. The experimental results show that the proposed method can guarantee the accuracy of ± 1.5 mm in the above cases.

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Funding

This work is supported by the China Aerospace Science & Industry Corp Foundation (grant number HTKG2017ZJT21081).

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Authors and Affiliations

  1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, People’s Republic of China

    Xiaolong Wang, Aimin Wang & Yuebo Li

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  1. Xiaolong Wang
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  2. Aimin Wang
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  3. Yuebo Li
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Correspondence to Aimin Wang.

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Recommended for publication by Commission I - Additive Manufacturing, Surfacing, and Thermal Cutting

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Wang, X., Wang, A. & Li, Y. An online surface height measurement method for GTAW-based additive manufacturing. Weld World 64, 11–20 (2020). https://doi.org/10.1007/s40194-019-00813-1

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  • DOI: https://doi.org/10.1007/s40194-019-00813-1

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