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Multi-mode ultrasonic welding control and optimization

United States Patent

May 28, 2013
View the Complete Patent at the US Patent & Trademark Office
A system and method for providing multi-mode control of an ultrasonic welding system. In one embodiment, the control modes include the energy of the weld, the time of the welding process and the compression displacement of the parts being welded during the welding process. The method includes providing thresholds for each of the modes, and terminating the welding process after the threshold for each mode has been reached, the threshold for more than one mode has been reached or the threshold for one of the modes has been reached. The welding control can be either open-loop or closed-loop, where the open-loop process provides the mode thresholds and once one or more of those thresholds is reached the welding process is terminated. The closed-loop control provides feedback of the weld energy and/or the compression displacement so that the weld power and/or weld pressure can be increased or decreased accordingly.
Tang; Jason C. H. (Sterling Heights, MI), Cai; Wayne W. (Troy, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 039,979
March 3, 2011
GOVERNMENT CONTRACT This invention was made with U.S. Government support under Contract No. DE-EE0002217 awarded by the Department of Energy. The Government has certain rights in this invention.