Capacitor discharge resistance spot welding of SiC fiber-reinforced Ti-6Al-4V

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Welding Journal (Miami); (United States)

OSTI ID:5627965

Cox, A ^[1]; Baeslack, W A ^[2]; Zorko, S; English, C ^[3]

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1. Bausch and Lomb Co., Rochester, N.Y. (United States)
2. Ohio State Univ., Columbus, OH (United States). Dept. of Welding Engineering
3. GE Aircraft Engines, Cincinnati, OH (United States)

Solid-state and fusion welds have been produced between sheets of monolithic and SiC fiber-reinforced Ti-6Al-4V using capacitor discharge resistance spot welding. Solid-state welds in monolithic sheet were characterized by beta grain growth across the weld interface, an alpha-prime martensite microstructure and the presence of occasional, fine interface discontinuities. Despite experiencing tensile-shear fracture along or directly adjacent to the weld interface, average tensile-shear fracture along or directly adjacent to the weld interface, average tensile shear strengths for optimized solid-state welds were comparable to those of conventional fusion spot welds produced at higher energy inputs which failed by nugget pullout. High integrity, solid-state welds were also produced in Ti-6Al-4V sheet containing 35 vol-% continuous SiC (SCS-6) fibers. Under optimized conditions, defect-free solid-state welds were produced which exhibited negligible evidence of fiber displacement or degradation. The weld zone was characterized by limited beta grain growth across the interface and a fine, martensitic microstructure. The average tensile shear strength for these welds was approximately 60% of the exhibited by optimized solid-state welds produced in the monolithic material. This strength reduction was attributed primarily to the initiation of tensile shear fracture in the vicinity of the weld outer periphery notch and propagation either along the fiber/matrix interface in the heat-affected zone (HAZ) directly adjacent and parallel to the weld interface or transverse through the sheet, in both cases remote from the weld interface.

• OSTI ID: 5627965
• Journal Information: Welding Journal (Miami); (United States), Journal Name: Welding Journal (Miami); (United States) Vol. 72:10; ISSN 0043-2296; ISSN WEJUA3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
FABRICATION
FRACTURE PROPERTIES
HEAT AFFECTED ZONE
JOINING
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
RESISTANCE WELDING
SILICON CARBIDES
SILICON COMPOUNDS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
WELDING
ZONES