Electron-beam Welding of Tungsten PDF Download
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Author: R. E. Monroe
Publisher:
ISBN:
Category : Electron beam welding
Languages : en
Pages : 48
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Book Description
Reported progress on the electron-beam welding of commercially pure W indicates that sound crack-free welds can be made if the weld is not restrained during welding. Although the data are not all consistent, welds which are smooth and have minimum fusion and heat-affected zone width should be the strongest and most ductile. Tensile strengths are equivalent to the base metal near the recrystallization temperature but are appreciably lower at room temperature. The ductile-to-brittle transition temperatures for electron-beam-welded tungsten are above that of the base metal. The impact resistance of electron-beam-welded tungsten is very low. Electron-beam welding of tungsten parts should be thoroughly evaluated on production prototypes before specifying its use. (Author).
Author: R. E. Monroe
Publisher:
ISBN:
Category : Electron beam welding
Languages : en
Pages : 48
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Book Description
Reported progress on the electron-beam welding of commercially pure W indicates that sound crack-free welds can be made if the weld is not restrained during welding. Although the data are not all consistent, welds which are smooth and have minimum fusion and heat-affected zone width should be the strongest and most ductile. Tensile strengths are equivalent to the base metal near the recrystallization temperature but are appreciably lower at room temperature. The ductile-to-brittle transition temperatures for electron-beam-welded tungsten are above that of the base metal. The impact resistance of electron-beam-welded tungsten is very low. Electron-beam welding of tungsten parts should be thoroughly evaluated on production prototypes before specifying its use. (Author).
Author: Harry A. Hokanson
Publisher:
ISBN:
Category : Electric welding
Languages : en
Pages : 1
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Book Description
Techniques for the high-voltage electron beam welding of pure W and arc-cast Mo-0.5% Ti were developed and evaluated. Welds were produced in sheet thicknesses of 0.005, 0.050, and 0.100 in. for each material. Primary emphasis was placed on producing butt welds of maximum strength and ductility. Limited work was performed on lap, seam, edge, and spot welding. The effects of various welding conditions on weld-zone characteristics were evaluated by visual, radiographic, fluorescent penetrant, and metallographic inspection. Welds were inspected for extent of fusion and recrystallization, grain size, cracking, porosity, and other pertinent effects. Butt welds of each thickness exhibiting optimum weldzone characteristics were evaluated for mechanical properties. Weld ductilities were determined by transverse bend testing at temperatures to 1200 F. Weld tensile properties were determined at room temperature and at temperatures to 2800 F. (Author).
Author: R. E. Monroe
Publisher:
ISBN:
Category : Tungsten
Languages : en
Pages : 12
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Book Description
Author: Z. S. Courtright
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
Author: H Schultz
Publisher: Woodhead Publishing
ISBN: 9781855730502
Category : Science
Languages : en
Pages : 246
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Book Description
Translated from the German, this is a practical book for engineers which explains the trials, development and manufacturing processes involved in electron beam welding.
Author: William D. Klopp
Publisher:
ISBN:
Category : Liquid metals
Languages : en
Pages : 42
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Book Description
A study has been conducted of the properties of tungsten fabricated from three ingots consolidated by electron-beam melting. The study included purity as a function of number of melts, recrystallization a d grain growth behavior, low-temperature ductility, and high-temperature tensile and creep strength. The level of most metallic impurities in tungsten decreased with increasing number of electron-beam melts, the reduction being greatest for aluminum, iron, nickel, and silicon. The levels of interstitial impurities generally were not affected by remelting. Resistivity ratios for single crystals machined from ingot slices tended to increase on remelting. The recrystallization rates for worked, electron-beam- melted (EB-melted) tungsten were significantly higher than those observed earlier for arc-melted tungsten. The grain growth rates of EB-melted tungsten were higher than those reported previously for arc-melted tungsten, further reflecting the higher purity of the EB-melted materials. The activation energies for both recrystallization and grain growth in EB-melted tungsten were consistent with expected values assuming grain boundary self-diffusion to be the rate-controlling reaction. The ductile-brittle bend transition temperature for EB-melted tungsten is slightly higher in the worked condition than that reported for arc-melted tungsten. In the recrystallized conditions, the transition temperatures for EB- and arc-melted tungsten are similar. The tensile strength of EB-melted tungsten at 2500 to 4000 F is less than that of arc-melted tungsten. This is partly associated with the large grain size of EB-melted tungsten. However, when compared at the same grain size,
Author: William I. Kern
Publisher:
ISBN:
Category : Electron beam welding
Languages : en
Pages : 196
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Book Description
High-voltage electron beam welding techniques capable of producing butt welds of optimum strength and ductility were developed for B120VCA titanium, D6AC steel, molybdenum-0.5% titanium to tungsten, and beryllium. Welds were produced in material thicknesses of 0.125 inch for the B120VCA titanium; 0.290 inch and 0.090 inch for the D6AC steel; 0.100 inch, 0.050 inch, and 0.005 inch for the molybdenum-0.5% titanium welded to tungsten; and 0.040 inch for the beryllium. The effects of thermal treatments (aging and heat treating) were investigated in the B120VCA and D6AC by welding and testing a variety of weld/thermal treatment combinations. A comprehensive preliminary welding phase was conducted during which the effects of various welding conditions on weld-zone characteristics were evaluated by visual, radiographic or dye penetrant, and metallographic inspection. Welds were evaluated for extent of fusion, grain size, cracking, porosity, and other pertinent effects.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Alloy 22 (N06022) is the material selected for the fabrication of the outer shell of the nuclear waste containers for the Yucca Mountain high-level nuclear waste repository site. A key technical issue in the Yucca Mountain waste package program has been the integrity of container weld joints. The currently selected welding process for fabricating and sealing the containers is the traditional gas tungsten arc welding (GTAW) or TIG method. An appealing faster alternative technique is reduced pressure electron beam (RPEB) welding. Standard electrochemical tests were carried on GTAW and RPEB welds as well as on base metal to determine their relative corrosion behavior in SCW at 90 C (alkaline), 1 M HCl at 60 C (acidic) and 1 M NaCl at 90 C (neutral) solutions. Results show that for all practical purposes, the three tested materials had the electrochemical behavior in the three tested solutions.
Author: Vincent David Barth
Publisher:
ISBN:
Category : Tungsten
Languages : en
Pages : 28
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Book Description
Author: H Schultz
Publisher: Elsevier
ISBN: 1845698789
Category : Technology & Engineering
Languages : en
Pages : 245
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Book Description
Translated from the German, this is a practical book for engineers which explains the trials, development and manufacturing processes involved in electron beam welding.
