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Process stability for GTAW-based additive manufacturing

Xiaolong Wang ( Beijing Institute of Technology , Beijing, China)
Aimin Wang ( Beijing Institute of Technology , Beijing, China)
Kaixiang Wang ( The University of Melbourne , Parkville, Australia)
Yuebo Li ( Beijing Institute of Technology , Beijing, China)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 19 June 2019

Issue publication date: 21 August 2019

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Abstract

Purpose

Traditional gas tungsten arc welding (GTAW) and GTAW-based wire and arc additive manufacturing (WAAM) are notably different. These differences are crucial to the process stability and surface quality in GTAW WAAM. This paper addresses special characteristics and the process control method of GTAW WAAM. The purpose of this paper is to improve the process stability with sensor information fusion in omnidirectional GTAW WAAM process.

Design/methodology/approach

A wire feed strategy is proposed to achieve an omnidirectional GTAW WAAM process. Thus, a model of welding voltage with welding current and arc length is established. An automatic control system fit to the entire GTAW WAAM process is established using both welding voltage and welding current. The effect of several types of commonly used controllers is examined. To assess the validity of this system, an arc length step experiment, various wire feed speed experiments and a square sample experiment were performed.

Findings

The research findings show that the resented wire feed strategy and arc length control system can effectively guarantee the stability of the GTAW WAAM process.

Originality/value

This paper tries to make a foundation work to achieve omnidirectional welding and process stability of GTAW WAAM through wire feed geometry analysis and sensor information fusion control model. The proposed wire feed strategy is implementable and practical, and a novel sensor fusion control method has been developed in the study for varying current GTAW WAAM process.

Keywords

Acknowledgements

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

Citation

Wang, X., Wang, A., Wang, K. and Li, Y. (2019), "Process stability for GTAW-based additive manufacturing", Rapid Prototyping Journal, Vol. 25 No. 5, pp. 809-819. https://doi.org/10.1108/RPJ-02-2018-0046

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited