Patents Assigned to Megastir Technologies
  • Expandable mandrel for use in friction stir welding
    Patent number: 8056797
    Abstract: A mandrel that provides a counter-force to the pressure exerted on the outside of a pipe or other arcuate surface by a friction stir welding tool, wherein the mandrel is expandable through the use of a wedge, and wherein the mandrel enables multiple friction stir welding heads to simultaneously perform welding on the arcuate surface.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: November 15, 2011
    Assignee: Megastir Technologies
    Inventors: Scott M. Packer, Jonathan A. Babb, Russell J. Steel, Monte Russell