Patents by Inventor Yang-Yang Zhao

Yang-Yang Zhao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Resistance welding with minimized weld expulsion
    Patent number: 9579744
    Abstract: A system for forming a weld nugget in a metal work piece includes a power supply, actuator, electrodes, and controller. The actuator delivers a variable electrode force to the work piece in response to a force command. The controller executes a method by transmitting a welding current command to the power supply to cause the power supply to output a welding current to the electrodes. The controller transmits the force command to the actuator to apply the variable electrode force, via the electrodes, to the work piece at a first force level. The variable electrode force increases from a second force level immediately upon conclusion of a first duration to minimize weld expulsion. The second force level commences at a point in time in the dynamic resistance profile at which a dynamic resistance value of the work piece decreases at a threshold rate during formation of the weld nugget.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: February 28, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Yansong Zhang, Guanlong Chen, Pei-Chung Wang, Yang-Yang Zhao, Xinmin Lai
  • RESISTANCE WELDING WITH MINIMIZED WELD EXPULSION
    Publication number: 20150034609
    Abstract: A system for forming a weld nugget in a metal work piece includes a power supply, actuator, electrodes, and controller. The actuator delivers a variable electrode force to the work piece in response to a force command. The controller executes a method by transmitting a welding current command to the power supply to cause the power supply to output a welding current to the electrodes. The controller transmits the force command to the actuator to apply the variable electrode force, via the electrodes, to the work piece at a first force level. The variable electrode force increases from a second force level immediately upon conclusion of a first duration to minimize weld expulsion. The second force level commences at a point in time in the dynamic resistance profile at which a dynamic resistance value of the work piece decreases at a threshold rate during formation of the weld nugget.
    Type: Application
    Filed: July 30, 2013
    Publication date: February 5, 2015
    Applicants: SHANGHAI JIAO TONG UNIVERSITY, GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Yansong Zhang, Guanlong Chen, Pei-Chung Wang, Yang-Yang Zhao, Xinmin Lai