Accession Number:

AD0920795

Title:

SST Technology Follow-on Program-Phase II. Development and Evaluation of the Aluminum-Brazed Titanium System. Volume II. Process R and D.

Descriptive Note:

Final rept. on Task 1,

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO SEATTLE WA

Personal Author(s):

• Boyer, R. R.
• Elrod, S. D.
• Lovell, D. T.

Report Date:

1974-05-01

Pagination or Media Count:

128.0

Abstract:

Aluminum-brazed titanium honeycomb sandwich developed for the SST prototype had specific process limits primarily due to lack of development time available. Designs were limited to light-gauge, constant-thickness panels with minimum core densities of 5 lbcu ft. Process research and development work was conducted on the DOTSST Phase II technology follow-on program to a extend the process to lower core densities and greater core depths, b investigate new braze alloys, core materials and configurations, c refine cleaning procedures, d develop techniques for improving quality of faying-surface brazements, e establish procedures for post-braze welding of sandwich assemblies, f develop brazing of curved and wedge configurations, and g determine feasibility of fabricating acoustic sandwich structure. Results of this program provide a more comprehensive understanding of process criteria for aluminum-brazed titanium honeycomb sandwich structure. Procedures were established for fabricating sandwich panels with core densities down to 1.6 lbcu ft and core depths up to 3 in. A unique rotating retort method was utilized for curved configurations. Techniques were developed for wedge-shape configurations, faying-surface braze joints, and post-braze welding. The feasibility of single and multilayer acoustic sandwich was demonstrated. Processes established by this program were utilized for fabricating test hardware for related development work. Author

Descriptors:

• *TITANIUM ALLOYS
• *BRAZING ALLOYS
• *SUPERSONIC TRANSPORT AIRCRAFT
• *ALUMINUM ALLOYS
• BRAZING
• AIRFRAMES
• HONEYCOMB STRUCTURES
• HONEYCOMB CORES
• PROCESSING
• WELDING
• CLEANING
• JET ENGINE NOISE
• NOISE REDUCTION
• AIRCRAFT PANELS
• JOINTS
• GEOMETRIC FORMS
• WEDGES
• CLEANING
• CONTAMINANTS

Subject Categories:

• Transport Aircraft
• Metallurgy and Metallography
• Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE