Accession Number : ADA255100

Title :   The Effects of Aluminum Oxide on Inertial Welding of Aluminum in Space Applications.

Descriptive Note : Master's thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Smith, Michael H.

Report Date : MAY 1992

Pagination or Media Count : 135

Abstract : Inertial friction welding of 2219 aluminum alloy studs to 2219 aluminum alloy plates is investigated in air and in an argon atmosphere to determine the effects of an intact oxide layer on weld quality. Scratch-brushing of plates and studs was performed in an argon atmosphere to break up the oxide layer and prevent reformation prior to testing. Argon was used to simulate the near-oxygen free space environment. Weld quality was determined by a bend test and by measurement of the fraction of the weld surface area that was dimpled in appearance following fracture of the weld. The fundamental theories of friction and wear that are applicable to friction welding are reviewed. A brief survey of current welding methods that may have application in space is presented, as well as a discussion of their feasibility and limitations. Characteristics of the space station are discussed as well as their consequences on welding in space. A qualitative model of the process of inertial friction welding based on the theories of friction and observations of welds and weld fractures is developed and presented.

Descriptors :   *ALUMINUM, *FRICTION WELDING, *OXIDES, *SPACE ENVIRONMENTS, AIR, ALLOYS, ALUMINUM ALLOYS, ARGON, ATMOSPHERES, ENVIRONMENTS, FRICTION, LAYERS, LIMITATIONS, MEASUREMENT, MODELS, OBSERVATION, OXYGEN, PLATES, QUALITY, SPACE STATIONS, STATIONS, SURFACES, SURVEYS, TEST AND EVALUATION, WEAR, WELDING, WELDS, THESES, FRACTURE(MECHANICS).

Subject Categories : Fabrication Metallurgy
      Astronautics

Distribution Statement : APPROVED FOR PUBLIC RELEASE