Compensation of Vertical Position Error Using a Force–Deflection Model in Friction Stir Spot Welding
Sponsor
This research was supported by the Ministry of Trade, Industry and Energy, Korea
Published In
Metals
Document Type
Article
Publication Date
12-2018
Subjects
High strength steel -- Welding, Friction stir welding, Adaptive control systems, Dissimilar welding
Abstract
Despite increasing need for friction stir spot welding (FSSW) for high-temperature softening materials, system deflection due to relatively high plunging force remains an obstacle. System deflection results in the vertical position error of a welding tool and insufficient plunge depth. In this study, we used adaptive control to maintain plunge depth, the plunging force was coaxially measured, and the position error was estimated using a force–deflection model. A linear relationship was confirmed between the force and deflection; this relationship is dependent on the stiffness of the welding system while independent of process parameters and base materials. The proposed model was evaluated during the FSSW of an Al 6061-T6 alloy sheet and a dissimilar metal combination of Al 6061-T6 alloy/dual phase (DP) 590 steel. Under varying process parameters, the adaptive control maintained a plunge depth with an error of less than 50 µm. Conventional position control has a maximum error of nearly 300 µm.
DOI
10.3390/met8121049
Persistent Identifier
https://archives.pdx.edu/ds/psu/28351
Citation Details
Yoon J, Kim C, Rhee S. Compensation of Vertical Position Error Using a Force–Deflection Model in Friction Stir Spot Welding. Metals. 2018; 8(12):1049.
Description
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).