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- W216394069 abstract "filler anaterials are extruded together to form a solid round rod, the filler materials are removed either by acid pickiing or by mechanical methods. The removal of the filler material on the inside of the tubing is greatly facilitated by the use of a graphite central core, which is extruded with the billet assembly and is removed by drilling before pickling of the fillem material. Two distinct extrusion methods were nomally used: at an extrusion temperature of 1800 deg C (3272 deg F) the billet filler material was molybdenum; at 1200 deg C (2192 deg F), the filler was molybdenum in combination with low carbon steel. Tubing with superior dimensional control and surface finish was obtained at the lower extrusion temperature. The tungsten tubing in the as-extruded condition was evaluated in a limited manner. The tubing, which was shown to be fully dense and free of cracks, had considerable ductility at temperatures near 400 deg C (750 deg F). Brittle-to-ductile transition temperatures as low as 40 deg C (100 deg F) were obtained. A technique of warm drawing the extruded tungsten tubing to obtain very good surface finishes and dimensions was developed. (auth)" @default.
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- W216394069 date "1965-10-31" @default.
- W216394069 modified "2023-09-27" @default.
- W216394069 title "DEVELOPMENT OF TECHNIQUES FOR FABRICATION OF SMALL-DIAMETER THIN-WALL TUNGSTEN TUBING. Interim Progress Report, July 1-December 31, 1963" @default.
- W216394069 doi "https://doi.org/10.2172/4653974" @default.
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