Laser Welding Parametric Study to Predict Fracture Toughness of Metastable Beta Titanium Alloys

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 28274
Amount: $80,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1995
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
American Research Corp Of Va
P.o. Box 3406, Radford, VA, 24143
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr. Dale O. Kipp
 (703) 731-0655
Business Contact
Phone: () -
Research Institution
Recent advances in aerospace technology have created the demand for improved structural materials. A metastable beta titanium alloy, TIMETAL Beta-21S, has been identified as a potential alloy for application in hypersonic vehicles such as the National AeroSpace Plane (NASP) because of its high strength-to-weight ration, high temperature service capability, excellent room temperature ductility and resistance to oxidation, corrosion, and hydrogen. High speed welding of this alloy will be necessary to achieve economic production of future aerospace structural members and skins. Previous research has indicated the suitability of CO2 laser welding in the production of large, thin sheets; however, further research is needed to optimize process parameters and develop techniques for predicting ultimate fracture toughness. American Research Company of Virginia (ARCOVA) proposes four technical objectives to demonstrate the capability to produce strong welds and the ability to predict ultimate fracture toughness in the welded joints. Specifically, in Phase I of the program ARCOVA will determine the laser process parameters for welding Beta 21S, fabricate a series of test samples using a fast-axial flow CO2 laser, characterize and test the samples, and model fracture toughness parameters using fuzzy logic expert systems.

* information listed above is at the time of submission.

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