Electron-beam welding of thorium-doped iridium alloy sheets. [Ir--0. 3% W 200 ppM Th-50 ppM Al]

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Modified iridium alloys containing 100 ppM Th were found to be very susceptible to hot-cracking during gas tungsten-arc and electron-beam welding. However, the electron-beam welding process showed greater promise of success in welding these alloys, in particular Ir--0.3% W doped with 200 ppM Th and 50 ppM Al. The weldability of this particular alloy was extremely sensitive to the welding parameters, such as beam focus condition and welding speed, and the resulting fusion zone structure. At low speed successful electron-beam welds were made over a narrow range of beam focus conditions. However, at high speeds successful welds can be made ... continued below

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Pages: 22

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David, S.A.; Liu, C.T. & Hudson, J.D. April 1, 1979.

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Description

Modified iridium alloys containing 100 ppM Th were found to be very susceptible to hot-cracking during gas tungsten-arc and electron-beam welding. However, the electron-beam welding process showed greater promise of success in welding these alloys, in particular Ir--0.3% W doped with 200 ppM Th and 50 ppM Al. The weldability of this particular alloy was extremely sensitive to the welding parameters, such as beam focus condition and welding speed, and the resulting fusion zone structure. At low speed successful electron-beam welds were made over a narrow range of beam focus conditions. However, at high speeds successful welds can be made over an extended range of focus conditions. The fusion zone grain structure is a strong function of welding speed and focus condition, as well. In the welds that showed hot-cracking, a region of positive segregation of thorium was identified at the fusion boundary. This highly thorium-segregated region seems to act as a potential source for the nucleation of a liquation crack, which later grows as a centerline crack.

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Pages: 22

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Dep. NTIS, PC A03/MF A01.

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  • Report No.: ORNL/TM-6711
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/6320475 | External Link
  • Office of Scientific & Technical Information Report Number: 6320475
  • Archival Resource Key: ark:/67531/metadc1206742

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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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Creation Date

  • April 1, 1979

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Feb. 21, 2019, 7:48 p.m.

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David, S.A.; Liu, C.T. & Hudson, J.D. Electron-beam welding of thorium-doped iridium alloy sheets. [Ir--0. 3% W 200 ppM Th-50 ppM Al], report, April 1, 1979; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1206742/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.