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Updated: May 12, 2025

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
Published on: August 13, 2019
Development of an Improved Stiffness Ellipsoid Method for Precise Robot-Positioner Collaborative Control in Friction
Cunfeng Kang1, Haonan Jia1, Eryang Zhao1
1College of Mechanical and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
Abstract:
This study proposes an improved stiffness ellipsoid method to enhance the stiffness and precision of robotic arms in friction stir welding (FSW) operations. The method involves establishing a joint stiffness model through static identification experiments and developing a novel stiffness index derived from the improved stiffness ellipsoid method. This index provides a refined metric for evaluating the robot's performance under variable loads during FSW. Simulation experiments demonstrate significant improvements in welding trajectory precision and computational efficiency. The findings highlight the potential of this method to elevate FW quality and consistency.
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