Abstract
This paper presents force control along the z-axis during friction stir welding (FSW) using a hybrid machine (F1300, Hwacheon Machinery). An admittance force controller is applied to control the position compensation of the tool for force change. During FSW with P-control, the values of the coefficients m, c, and k satisfying the position output of the tool for unit force input are selected as the coefficients for the controller. In the frequency domain analysis of the open loop transfer function, the coefficients are optimized to suppress, low pass, or cut-off of noise of the vibration data. Verification experiments revealed that the sensitivity of the axial force was up to 32.5 kgf, the tool position compensation value in the axial direction was stably controlled within 0.1 mm, and the internal voids of the material could be further reduced.
Published Version
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