Compensation of Vertical Position Error Using a Force–Deflection Model in Friction Stir Spot Welding

Metals

卷:8

Jinyoung Yoon¹  Cheolhee Kim¹  Sehun Rhee² 

[1] Joining Research Group, Korea Institute of Industrial Technology, Incheon 21999, Korea;

[2] School of Mechanical Engineering, Hanyang University, Seoul 04763, Korea;

关键词: friction stir spot welding;    plunge depth;    adaptive control;    force–deflection model;    high-temperature softening materials;    dissimilar metal welding;   

DOI  :  10.3390/met8121049

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown