FUSION WELDING OF END CAPS IN BERYLLIUM TUBES
Journal Article
·
· Welding J. (N.Y.)
OSTI ID:4722475
Beryllium appears attractive as a potential cladding material for fuel elements for advanced gas cooled reactor applications. As a result, a program was undertaken to develop procedures for successfully fabricating berylliumclad fuel elements and to determine the mechanical properties of these welds. Welding parameters affecting the integrity of tungsten-arc welds in 0.30 in. OD x 0.040 in. wall tubing were investigated. Based on a study of three joint designs, it was determined that the edge-fusion type proved to be better than either the butt- or plug-type design. To eliminate root cracking in the welds, it was necessary to obtain a very ttght fit-up of the end cap and tube by tapering the joint about 3 deg. Additional refinements such as preheating the joint to 1400 deg F under a suitable cover gas of argon reduced the propensity of crack formation and propagation during welding and cool-down. An evaluation of seven different lots of tubing produced by six fabrication processes showed that welds in extruded tubing exhibited a tendency to be porous, whereas welds in machined tubing did not. All the material tested had welds of comparable strengths, having shear strergth in the order of 20,000 psi at room temperature and 10,000 psi at 1100 deg F (593 deg C). To date, no service failures attributable to defective welds have been reported for approximately 300 tube-burst specimens tested in or out of the reactor. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- NSA Number:
- NSA-17-008767
- OSTI ID:
- 4722475
- Journal Information:
- Welding J. (N.Y.), Journal Name: Welding J. (N.Y.) Vol. Vol: 42
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
THE CONVERSION OF EXTRUDED BERYLLIUM TUBING TO A CLOSE TOLERANCE BORE TUBE. Laboratory Report 1812. Includes Appendices: B. THE TROUBLE WITH BERYLLIUM. C. NITRIC FUME SCRUBBING
Fabrication of oxide dispersion strengthened ferritic clad fuel pins
FUNDAMENTAL AND APPLIED RESEARCH AND DEVELOPMENT IN METALLURGY. DEVELOPMENT OF A FABRICATION PROCESS FOR SEAMLESS TUNGSTEN TUBING. Summary Technical Report to the United States Atomic EnergyCommission for the Period July 1, 1962-June 30, 1963
Technical Report
·
Sat Feb 14 23:00:00 EST 1959
·
OSTI ID:4097785
Fabrication of oxide dispersion strengthened ferritic clad fuel pins
Conference
·
Mon Dec 31 23:00:00 EST 1990
·
OSTI ID:5166718
FUNDAMENTAL AND APPLIED RESEARCH AND DEVELOPMENT IN METALLURGY. DEVELOPMENT OF A FABRICATION PROCESS FOR SEAMLESS TUNGSTEN TUBING. Summary Technical Report to the United States Atomic EnergyCommission for the Period July 1, 1962-June 30, 1963
Technical Report
·
Thu Oct 17 00:00:00 EDT 1963
·
OSTI ID:4629787