Friction stir welding tool having a counterflow pin configuration
Dwight A. Burford, inventor. Wichita State University, assignee. Friction stir welding tool having a counterflow pin configuration. United States patent: US 7,942,306, 2011, May 17.
A friction stir welding tool having one or more tapered flats for promoting flow of weld material toward the pin terminus and one or more counter-spiraling channels or threads which for promoting flow of the weld material toward the tool shoulder.
WSU inventor: Dwight A. Burford, Director, WSU Research Site, NSF Center for Friction Stir Processing (July 2007- June 2012); Senior Research Scientist and Director, NIAR Advanced Joining & Processing Laboratory (Aug 2005-June 2012)
Appl. no.: 11/786,961 filed Apr 13, 2007. U.S. Patent 7,942,306 granted May 17, 2011.