BRAZING TITANIUM SANDWICH CONSTRUCTION. Period covered: July 1, 1957 to July 30, 1958
The purpose of this project was to study the feasibillty of fabricating titanium alloy face sheet honeycomb sandwiches by brazing techniques. The program was conveniently divided into several phases: selection of face sheet alloy and brazing alloys, fabrication of sandwiches by various experimental methods, and mechanical evaluation of the resulting panels. The emphasis was placed on the second phase, fabrication processes. The survey of possible face sheet alloys is discussed in some detail. The result of this survey was the decision to incorporate Mallory-Sharon's MST 16V-2 1/2Al for the alloy for primary consideration as the face sheet in the brazing process experimentation. In addition to the above alloy, Republic Steel-'s RS 140 (5Al-23/4Cr-1 1/4Fe) was chosen as an alternative alloy for brazing above the beta transus (-1440 F) of the MST alloy. In making these selections consideration was given to producibility in thin-rolled sections, mechanical properties at room and elevated temperatures, and, possibly most important, the compatibility of the- heat treatment cycle with the envisioned practical brazing cycle. A evaluation of 17 brazing alloys as regards wettability, mechanical strength, oxidation resistance, and corrosion resistance resulted in the recommendation of Ag-28Cu -0.2Li and Ag- 0.25Mg0.2Ni-1Li as the best alloys for brazing titanium-cored panels at a brazing temperature of 1500 F. Ag-28 Cu-0.2Li was the stronger of the two. These two alloys plus Ag-7Cu-0.2Li and Ag-30Cu-10Sn were found to be satisfactory for brazing stainless steel cored Panel at 1600 F. Of these four alloys, Ag-28Cu- 0.2Li and Ag-7Cu-0.2Li gave the strongest joints. The process development phase centered around the development of a quartz lamp radiant heat brazement process. The details of the process, as used, and a discussion of suggested modifications and improvements for application of the same principles to large-production panel fabrication, are presented. Although the process development experiments were conducted with titanium alloy face sheet materials, the results are applicable to sandwich panel production in general. The primary advantages of quartz lamp radiant heat over presently used furnace retort techniques have to do with inherent rapid heating and cooling rates, good temperature uniformity and brazing time control, and general cleanliness of the heat source for atmosphere purity purposes. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- DOE Contract Number:
- AF33(616)-5357
- NSA Number:
- NSA-13-010054
- OSTI ID:
- 4260731
- Report Number(s):
- WADC-TR-58-467; AD-207904
- Resource Relation:
- Other Information: Project title: METALLIC MATERIALS. Task title: WELDING BRAZING AND SOLDERING OF METAL. Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ADDITIVES- COPPER ALLOYS- EFFICIENCY- LITHIUM- SILVER ALLOYS
ADDITIVES- LITHIUM ALLOYS- MAGNESIUM- NICKEL- SILVER ALLOYS
ADHESION- ALLOYS- ALUMINUM ALLOYS- BRAZING- CHEMICAL REACTIONS- CHROMIUM STEELS- CLEANING- CONTROL- COOLING- FABRICATION- HEAT TREATMENTS- HIGH TEMPERATURE- HONEYCOMB- IMPURITIES- INERT GASES- JOINTS- MACHINE PARTS- MECHANICAL PROPERTIES- MECHANICAL STRUCTURES- OXIDATION- PLANNING- QUARTZ- ROLLING- SHEETS- STABILITY- STAINLESS STEELS- TEMPERATURE- TENSILE PROPERTIES- THERMAL RADIATION- THICKNESS- TITANIUM ALLOYS- USES- VANADIUM ALLOYS- VELOCITY
COPPER ALLOYS- SILVER ALLOYS- TIN