SOLID STATE BONDING OF PROTOTYPE TITANIUM ROCKET MOTOR CASINGS.
Abstract
Solid state bonding techniques were successfully used to fabricate large diameter thin-walled simulated motor casings employing a high-strength titanium alloy. Circumferential bonds were located at the interface of the hemispherical end closures and each end of the cylindrical center section. With this technique, plastic deformation and bonding occurred simultaneously in the joint interface (at or below the beta-transus temperature), thus eliminating the usual as-cast structure and heat-affected zone obtained in fusion welding. The casing was approximately 2 feet in diameter by 3 feet long, with a wall thickness of 0.080 inch throughout the cylindrical center section. The material used was the alpha-plus-beta type alloy, Ti-6Al6V -2Sn. The fabricated cases were heat treated to a minimum uniaxial yield strength of 175,000 psi. A completed casing was hydrostatically burst tested with no failures occurring at or along the joints. The nominal hoop stress in the center portion of the casing midway between the bonded areas was calculated to be in excess of 240,000 psi at the point of failure. The fracture was of a ductile nature exhibiting 100 percent shear in the cylindrical section of the casing. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1964
- Accession Number
- AD0610660
Entities
People
- F. J. Rizzitano
- Robert Fitzpatrick
- Robert M. Colton
Organizations
- United States Army Research Laboratory