Patents by Inventor David Cafarelli

David Cafarelli 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).

  • Turbine blade tip rail formation and repair using laser welding
    Patent number: 10486272
    Abstract: Methods of forming or repairing a tip rail of a turbine are disclosed. One method may include repairing the tip rail, or adding material to form the tip rail, by laser irradiating a wire material with a laser in an inert gas in a vicinity of a tip plate. The laser irradiating the wire material includes modulated pulsing the laser through: a warm up phase during which an on-power of the laser is increased over time to a maximum target on-power, a melt and bond phase during which the wire material is melted and during which the on-power is less than the maximum target on-power, and a stress releasing phase during which the on-power of the laser is less than the on-power during the melt and bond phase. Exterior surface coatings and/or TBC may be sprayed onto the tip rail to protect it.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: November 26, 2019
    Assignee: General Electric Company
    Inventors: Klaus-Dieter Hermann Maximilian Wassmer, Hans Bissig, David Cafarelli, Norbert Lucke, Fabrizio Mangano
  • TURBINE BLADE TIP RAIL FORMATION AND REPAIR USING LASER WELDING
    Publication number: 20190275618
    Abstract: Methods of forming or repairing a tip rail of a turbine are disclosed. One method may include repairing the tip rail, or adding material to form the tip rail, by laser irradiating a wire material with a laser in an inert gas in a vicinity of a tip plate. The laser irradiating the wire material includes modulated pulsing the laser through: a warm up phase during which an on-power of the laser is increased over time to a maximum target on-power, a melt and bond phase during which the wire material is melted and during which the on-power is less than the maximum target on-power, and a stress releasing phase during which the on-power of the laser is less than the on-power during the melt and bond phase. Exterior surface coatings and/or TBC may be sprayed onto the tip rail to protect it.
    Type: Application
    Filed: March 6, 2018
    Publication date: September 12, 2019
    Inventors: Klaus-Dieter Hermann Maximilian Wassmer, Hans Bissig, David Cafarelli, Norbert Lucke, Fabrizio Mangano