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Linear friction weld process monitoring of fixture cassette deformations using empirical mode decomposition
journal contribution
posted on 2015-05-07, 10:36 authored by O.J. Bakker, C. Gibson, P. Wilson, Niels Lohse, A.A. PopovDue to its inherent advantages, linear friction welding is a solid-state joining process of increasing importance to the aerospace, automotive, medical and power generation equipment industries. Tangential oscillations and forge stroke during the burn-off phase of the joining process introduce essential dynamic forces, which can also be detrimental to the welding process. Since burn-off is a critical phase in the manufacturing stage, process monitoring is fundamental for quality and stability control purposes. This study aims to improve workholding stability through the analysis of fixture cassette deformations. Methods and procedures for process monitoring are developed and implemented in a fail-or-pass assessment system for fixture cassette deformations during the burn-off phase. Additionally, the de-noised signals are compared to results from previous production runs. The observed deformations as a consequence of the forces acting on the fixture cassette are measured directly during the welding process. Data on the linear friction-welding machine are acquired and de-noised using empirical mode decomposition, before the burn-off phase is extracted. This approach enables a direct, objective comparison of the signal features with trends from previous successful welds. The capacity of the whole process monitoring system is validated and demonstrated through the analysis of a large number of signals obtained from welding experiments.
Funding
The authors wish to acknowledge the support of the European Commission through the 7th Framework Programme under call FP7-AAT-2007-RTD-1 (FLEXA; Grant agreement 213734) and support of EPSRC through SAMULET Project 5: Processing Advanced Materials.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Mechanical Systems and Signal ProcessingCitation
BAKKER, O.J. ... et al., 2015. Linear friction weld process monitoring of fixture cassette deformations using empirical mode decomposition. Mechanical Systems and Signal Processing, 62–63, pp.395–414.Publisher
© Elsevier Ltd.Version
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015ISSN
0888-3270Publisher version
Language
- en