Closed-Loop Control of the Thermal Stir Welding Process to Enable Rapid Process / Part Qualification

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$698,715.00
Award Year:
2013
Program:
STTR
Phase:
Phase II
Contract:
NNX13CM36C
Award Id:
n/a
Agency Tracking Number:
110023
Solicitation Year:
2011
Solicitation Topic Code:
T9.01
Solicitation Number:
n/a
Small Business Information
664 NW Enterprise Drive, Suite 118, Port Saint Lucie, FL, -
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
114133213
Principal Investigator:
BryantWalker
Principal Investigator
(772) 343-7544
bryanthwalk@aol.com
Business Contact:
BryantWalker
President
(772) 434-7544
bryanthwalk@aol.com
Research Institute:
Mississippi State University
LeLe Waits
449 Hardy Road 133 Etheredge Hall P.O. Box 6156
Mississippi State, MS, 39762-39762
() -

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 II STTR project to demonstrate the feasibility of closed-loop control of the TSW process and to enable the establishment of a analytically 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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