Weld overlay cladding with iron aluminides
- Oak Ridge National Lab., TN (United States)
The hot and cold cracking tendencies of some early iron aluminide alloy compositions have limited their use in applications where good weldability is required. Using hot crack testing techniques invented at ORNL, and experimental determinations of preheat and postweld heat treatment needed to avoid cold cracking, we have developed iron aluminide filler metal compositions which can be successfully used to weld overlay clad various substrate materials, including 9Cr-1Mo steel, 2-1/4Cr-1Mo steel, and 300-series austenitic stainless steels. Dilution must be carefully controlled to avoid crack-sensitive deposit compositions. The technique used to produce the current filler metal compositions is aspiration-casting, i.e. drawing the liquid from the melt into glass rods. Future development efforts will involve fabrication of composite wires of similar compositions to permit mechanized gas tungsten arc (GTA) and/or gas metal arc (GMA) welding.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- OSTI ID:
- 416494
- Report Number(s):
- ORNL/FMP--95/1; CONF-9505204--; ON: DE96001412
- Country of Publication:
- United States
- Language:
- English
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