Colosed-Loop Control of the Thermal Stir Welding Process to Enable Rapid Process/Ppart Qualification

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX12CG36P
Agency Tracking Number: 110023
Amount: $124,883.00
Phase: Phase I
Program: STTR
Awards Year: 2012
Solicitation Year: 2011
Solicitation Topic Code: T9.01
Solicitation Number: N/A
Small Business Information
Keystone Synergistic Enterprises, Inc.
664 NW Enterprise Drive, Suite 118, Port Saint Lucie, FL, -
DUNS: 114133213
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Bryant Walker
 Principal Investigator
 (772) 343-7544
 bryanthwalk@aol.com
Business Contact
 Bryant Walker
Title: President
Phone: (772) 343-7544
Email: bryanthwalk@aol.com
Research Institution
 Mississippi State University
 Lele Waits
 P.O. Box 6156
Mississippi State University, MS, 39762-0000
 () -
 Domestic nonprofit research organization
Abstract
Thermal Stir Welding (TSW) provides advancement over the more conventional Friction Stir Welding (C-FSW) process because it separates the primary processes variables thereby allowing independent control of metal stirring and forging from the stir zone temperature. However, the feedback for precise control of the stir zone temperature, and hence the process parameters to sustain that temperature within a narrow range, does not currently exist on the TSW machine at the NASA Marshall Space Flight Center (MSFC). At present, the current state of the art for the selection of process parameters for both TSWing and C-FSWing parameters is highly empirical and by nature is based on phenomenological knowledge. In response to this need, Keystone is proposing this Phase I SBIR project to demonstrate the feasibility of closed-loop control of the TSW process and to enable the establishment of a theoretically derived processing map to accelerate process understanding and selection of parameters for a given material and pin tool design. The close-loop control system will enable sustainment of a steady-state temperature at the stir rod as a function of spindle RPM and the travel velocity for a given z-axis loading and stir rod design. Use of this theoretically derived processing map will provide guidance in the optimization of the process parameter domain for solid-state welding of a given material. This capability will in turn enable rapid process qualification of the TSW process and components produced by the process.

* information listed above is at the time of submission.

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