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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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Technique improves the service life of fuel cell electrodes. The welding is done before the metallic sinter is activated by depositing finely divided metal within the sinter structure from a solution with corrosion inhibiting ions. The activator solution flows through the porous sinter while attached to the backup plate.
Duranel ring is used to join aluminum and stainless steel tubing. Duranel is a bimetal made up of roll-bonded aluminum and stainless steel. This method of joining the tubing requires only two welding operations.
Weld angle is measured to the nearest arc minute and offset to one thousandth of an inch by an instrument designed to use a reference plane at two locations on a test coupon. A special table for computation has been prepared for use with the instrument.
Cold welding tendencies and frictional studies of clean metal combinations under ultra high vacuum
Encapsulation technique minimizes embedment and thermal stresses in welded electronic modules. A coating of thinned room-temperature- vulcanizing silicone rubber having a high coefficient of expansion and flexibility at low temperature, is applied first and then an encapsulating epoxy resin having a relatively low coefficient of expansion is added.
Uncontrolled high frequency current causes cracking in the heat-affected zone of aluminum alloy 6061 weldments during tungsten inert gas ac welding. Cracking developed when an improperly adjusted superimposed high frequency current was agitating the semimolten metal in the areas of grain boundary.
Improved scarfing tool consists of a mount-table, roller-guided assembly. It converts a conventional routing machine for relatively precise field preparation of pipes for welding.
Nondestructive testing for detecting lack of penetration in aluminum fusion welds
Welding of aluminum alloys applicable to Saturn 5 structural component fabrication
Methods for welding and locally reaging aged 18 percent nickel grade VAR maraging steel
Metallographic studies, weld test data, and performance of out-of-vacuum electron beam welder
Nondestructive ultrasonic testing for rapid inspection of weld defects in aluminium alloys
Tensile strength and X ray analysis of resistance spot welded aluminum and stainless steel alloys
Welding of precipitation hardening stainless steels
Combination of three techniques for nondestructive determination of weld quality in electronic circuits
Ultrasonic radiography for weld flaw detection in butt joints of Saturn 5 S-1C stage
Failure analysis of tooling boss weld in lower bulkhead of Saturn 1C stage fuel tank
Evaluation of various power supplies for gas tungsten arc welding of aluminum