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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Generation of intense sonic and ultrasonic power in the weld zone, close to the puddle, reduces the porosity and refinement of the grain. The ac induction brazing power supply is modified with long cables for deliberate addition of resistance to that circuit. The concept is extensible to the molding of metals and plastics.
Test program is used in the design and fabrication of special graduated aluminum penetrometers. The program evaluates the threshold detection capabilities of a fixed radiographic technique in detecting surface and subsurface cracks in one-quarter inch aluminum welds. The radiographic films were evaluated and the threshold detection capabilities defined.
Adjustable transducer probe, which is attached to a welding torch and maintains a preset touch-to-work distance, accurately follows irregular surfaces, is less sensitive to heat and static interference, and has more positive response because of electro-mechanical control.
Welding temperature effects on protective properties of chromate conversion coating for Saturn 5 tank
Radiographic techniques determining aluminum weld surface and subsurface cracks using aluminum penetrameters
Creep rupture data on welded tubes for helium to air heat exchanger design
Amplitude controlled welding process for electronic circuit modules
Development of automatic quality control device for measuring welded joints
Electron beam welding procedure planning and production shop control parameters
Wrought superalloys fusion welding behavior, discussing hot cracking, hot microfissuring and strain age cracking
Vacuum effects on resistance spot welds in aluminum, stainless steel and titanium alloys, noting X ray and tensile shear test results
Resistance spot welds in Al, Ti and stainless steel in air and hard vacuum, showing feasibility for space assembly
Plasma electron beam for welding, deriving beam current from secondary emission by ion bombardment, discussing gas pressure, equipment and applications
Mn, S and rare earth additions influence on Inconel alloy weld microfissuring including material, hot ductility and tensile strength data
Energy transferred from the source to the workpiece is maximized by relying on the mobility of the material in its liquid phase. This permits more beam energy to transfer to the weld front.
Reliable and accurate Delta technique, a nondestructive ultrasonics method, uses redirection of energy to detect randomly oriented imperfections in fusion butt welds. Data on flaws can be read from either an oscilloscope or a printout.
Miniaturized positioner is installed in any electron beam vacuum chamber for use with wire feed applications requiring filler wire. Horizontal and vertical control of the positioner is maintained from a console while chamber is under vacuum. Device permits more positive positioning of welding filler wire.
Prototype nondestructive weld tester design and evaluation