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Adaptive process control of wire and arc additive manufacturing for fabricating complex-shaped components

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Abstract

In wire and arc additive manufacturing (WAAM), it is crucial to maintain a constant travel speed in order to achieve a uniform bead morphology along the tool-path. However, this requirement is always violated in practice because the welding robot has to slow down when sharp corners with high curvatures are encountered so as to satisfy the dynamic constraint. The consequence is excessive fillings (i.e. humps) around these sharp corners, which not only increase the required post processing, but also prevent the continuation of the deposition process if the accumulated errors in the build direction become too large. This issue greatly limits the application of WAAM in the fabrication of complex-shaped components. In this paper, an adaptive process control scheme (APCS) capable of guaranteeing a uniform bead morphology while still respecting the dynamic constraint is proposed. First, the APCS divides the tool-path into several segments depending on whether they contain sharp corners. Then, for each segment, the APCS automatically selects the allowable travel speed subjected to the dynamic constraint, and also the wire-feed rate according to a process model established in advance. Through the matching between the travel speed and the wire-feed rate, a uniform bead morphology among different segments is achieved. Experiments were conducted on a gantry robot using the Cold Metal Transfer (CMT) process, controlled by a self-developed computer numerical control (CNC) system, validating the efficacy of the proposed scheme.

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Funding

This paper was supported by the National Natural Science Foundation of China (no. 51475009) and China Postdoctoral Science Foundation (no. 2017 M610726).

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Authors and Affiliations

  1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, 100124, China

    Fang Li, Shujun Chen, Zhaoyang Wu & Zhihong Yan

  2. Engineering Research Center of Advanced Manufacturing Technology for Automotive Components-Ministry of Education, Beijing University of Technology, Beijing, 100124, China

    Fang Li, Shujun Chen, Zhaoyang Wu & Zhihong Yan

Authors
  1. Fang Li
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  2. Shujun Chen
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  3. Zhaoyang Wu
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  4. Zhihong Yan
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Correspondence to Shujun Chen.

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Li, F., Chen, S., Wu, Z. et al. Adaptive process control of wire and arc additive manufacturing for fabricating complex-shaped components. Int J Adv Manuf Technol 96, 871–879 (2018). https://doi.org/10.1007/s00170-018-1590-0

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  • DOI: https://doi.org/10.1007/s00170-018-1590-0

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