ARC WELDING OF A Ni-Cr-Fe (INCONEL) ALLOY FOR NUCLEAR POWER PLANTS
An investigation was made of the arc welding of Inconel, using commercially available filler metals and the shielded-metal-arc, inert-gas tungsten-arc, and inert-gas metal-arc welding processes. Weldments meeting the high-quality standards required for nuclear power plant service can be made with all of the filler metals and processes studied.. In general, all structural welds of Inconel to itself, to Type 304 stainless steel, or to carbon steel failed in the weaker base metal when tested for static tensile properties. All- weld-metal mechanical properties of the Inconel-type filler metals exceeded those of the annealed wrought base metal. Covered electrodes for welding Inconel exhibited somewhat more difficult usabilities than did the standard stainless- steel electrodes. Inconel-type filler metals were modified by additions of niobium, Nb-Mn, or titanium for specific applications. Both the niobium- and titanium-modified filler metals, when welding with the shielded metal arc or the inert-gas metal-arc welding processes, produced deposits which exhibit fissures of various sizes, depending on several factors. The bare wire filler metals, used with the manual inert-gas tungsten-arc welding process, usually produced fissure-free deposits. These fissures, which were detected in metallographic examination and in bend tests, were intergranular and appeared to be caused by the segregation of some low strength phase during solidification of the weld deposits. The Nb-Mn modified electrodes deposit weld metal essentially free from porosity and fissures. Weld deposited overlays made with the Inconel-type filler metals on carbon steel exhibited bend properties comparable to those of structural butt weld deposits. Iron dilution of the alloy deposit varied with technique aud/or process used. (auth)
- Research Organization:
- General Electric Co., Schenectady, N.Y.
- NSA Number:
- NSA-15-006361
- OSTI ID:
- 4075277
- Journal Information:
- Welding J. (N.Y.), Journal Name: Welding J. (N.Y.) Vol. Vol: 40
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
CARBON STEELS
CHROMIUM ALLOYS
CRACKS
DEFORMATION
ELECTRIC ARCS
ELECTRODES
FAILURES
FILLERS
INCONEL ALLOYS
INERT GASES
IRON ALLOYS
MANGANESE
MECHANICAL PROPERTIES
METALLOGRAPHY
METALS
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
NICKEL ALLOYS
NIOBIUM
NIOBIUM ALLOYS
POROSITY
STAINLESS STEELS
TENSILE PROPERTIES
TESTING
TITANIUM
TITANIUM ALLOYS
TUNGSTEN
WELDING