High-power laser and arc welding of thorium-doped iridium alloys [electronic resource].
- Published
- Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- Pages: 38 : digital, PDF file
- Additional Creators
- Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- The arc and laser weldabilities of two Ir-0.3% W alloys containing 60 and 200 wt ppM Th have been investigated. The Ir-.03% W alloy containing 200 wt ppM Th is severely prone to hot cracking during gas tungsten-arc welding. Weld metal cracking results from the combined effects of heat-affected zone liquation cracking and solidification cracking. Scanning electron microscopic analysis of the fractured surface revealed patches of low-melting eutectic. The cracking is influenced to a great extent by the fusion zone microstructure and thorium content. The alloy has been welded with a continuous-wave high-power CO/sub 2/ laser system with beam power ranging from 5 to 10 kW and welding speeds of 8 to 25 mm/s. Successful laser welds without hot cracking have been obtained in this particular alloy. This is attributable to the highly concentrated heat source available in the laser beam and the refinement in fusion zone microstructure obtained during laser welding. Efforts to refine the fusion zone structure during gas tungsten-arc welding of Ir-0.3 % W alloy containing 60 wt ppM Th were partially successful. Here transverse arc oscillation during gas tungsten-arc welding refines the fusion zone structure to a certain extent. However, microstructural analysis of this alloy's laser welds indicates further refinement in the fusion zone microstructure than in that from the gas tungsten-arc process using arc oscillations. The fusion zone structure of the laser weld is a strong function of welding speed.
- Report Numbers
- E 1.99:ornl/tm-7258
ornl/tm-7258 - Subject(s)
- Other Subject(s)
- Iridium Alloys
- Weldability
- Cracks
- Doped Materials
- Fuels
- Gas Tungsten-Arc Welding
- Laser Welding
- Microstructure
- Solidification
- Thermoelectric Generators
- Thorium Additions
- Tungsten Additions
- Actinide Alloys
- Alloys
- Arc Welding
- Crystal Structure
- Direct Energy Converters
- Fabrication
- Joining
- Materials
- Phase Transformations
- Platinum Metal Alloys
- Thorium Alloys
- Tungsten Alloys
- Welding
- Nesdps Office Of Nuclear Energy Space And Defense Power Systems
- Note
- Published through SciTech Connect.
05/01/1980.
"ornl/tm-7258"
Liu, C.T.; David, S.A. - Funding Information
- W-7405-ENG-26
View MARC record | catkey: 14068471