Characterization of Electron Beams in Multiple Welders Using the Enhanced Modified Faraday Cup

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Using the Enhanced Modified Faraday Cup (EMFC), the differences in the beams produced by two electron beam (EB) welders are characterized at different focus settings and work distances. For example, EMFC measurements show that sharply focused beams display different shapes and peak power densities which vary by nearly 20% for the same welding parameters on these two welders. Increases in work distance on each machine were shown to result in decreases in both the peak power density and the resulting weld size and shape. Because of the differences in machine performance, additional differences arise when comparing the welds produced by ... continued below

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Palmer, T A & Elmer, J W August 1, 2006.

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Using the Enhanced Modified Faraday Cup (EMFC), the differences in the beams produced by two electron beam (EB) welders are characterized at different focus settings and work distances. For example, EMFC measurements show that sharply focused beams display different shapes and peak power densities which vary by nearly 20% for the same welding parameters on these two welders. Increases in work distance on each machine were shown to result in decreases in both the peak power density and the resulting weld size and shape. Because of the differences in machine performance, additional differences arise when comparing the welds produced by each machine. These different weld dimensions are attributed to differences in the beam shape and a 70 mm difference in the theoretical beam crossover location in the upper column of the two welders. The crossover location, which can not be physically measured, is determined using the EMFC by analyzing the beam distribution parameters of sharply focused beams over a range of work distances and can be used to explain the variation in the peak power densities of the two machines. Once the machines are characterized using this quantitative tool, changes in either the beam focus or work distance can be made to attain similar beams from different welders, thus providing a baseline for developing modern weld transfer procedures.

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PDF-file: 39 pages; size: 1.1 Mbytes

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  • Presented at: International Institute of Welding, Quebec City, Canada, Aug 27 - Sep 02, 2006

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  • Report No.: UCRL-CONF-223475
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 900060
  • Archival Resource Key: ark:/67531/metadc883142

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 10:13 p.m.

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Palmer, T A & Elmer, J W. Characterization of Electron Beams in Multiple Welders Using the Enhanced Modified Faraday Cup, article, August 1, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc883142/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.