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J Weld Join > Volume 42(5); 2024 > Article
Journal of Welding and Joining 2024;42(5):481-486.
DOI: https://doi.org/10.5781/JWJ.2024.42.5.5    Published online October 31, 2024.
Evaluation of Quality for Flow Drill Screw (FDS) Joining Process Based on Loosening Torque
Tae-Jeong Kim1  , Se-Jin Ko1  , Wook-Jin Oh1  , Ji-Hong Lee2 
1Body Material Development Team, Hyundai Motor Company, Hwaseong, 18280, Korea
2Manufacturing SI Engineering R&D TEAM 3, Kia, Uiwang, 16082, Korea
Correspondence:  Tae-Jeong Kim,
Email: voidian@hyundai.com
Received: 26 July 2024   • Revised: 13 August 2024   • Accepted: 29 August 2024
Abstract
Although the SPR process is widely used for joining of multi-materials, the FDS process is used when one-way joining is required, such as space constraints or closed cross-sectional parts. The quality inspection for the FDS process is basically an appearance inspection or cross-sectional inspection. There is no non-destructive test method that can be used in the actual mass production line, and a method of utilizing loosening torque is being studied. In this study, the factors affecting the loosening torque are analyzed, and an experimental equation that can predict the loosening torque is derived. Since friction force between the screw and the upper plate and sticking on the screw thread resist against loosening torque, the prediction equation for each factor is considered and the least square method is used to obtain the coefficients of the experimental equation. The prediction equation of the loosening torque derived through experiments on 36 material combinations predicts the experimental values well. When a quality requirement value with a given margin is applied, it can be used as a non-destructive test method.
Key Words: Mechanical joining, FDS, Flow drill screw, Non-destructive test, Quality tnspection, Torque


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