Weld Strength and Heat Affected Zone Size in Friction Welded NFA and CostE
- BATTELLE (PACIFIC NW LAB)
- Brigham Young University
- GE Global Research
- Ohio State University
Friction welding (FW) enables joining of dissimilar metals parts up to the limits of their strength. CostE and NFA are two high-temperature steel alloys used in land-based power generation. These alloys were joined with FW, and the effect of process parameters on post-welded structure and tensile strength was studied. Weld energy primarily determined the heat-affected zone (HAZ) thickness in both alloys. The highest joint efficiencies – up to 96% – resulted from contact strengthening of thin NFA HAZ regions, but too thin of a HAZ resulted in an unreliable joint. Conversely, thick HAZ regions consistently lowered the weld strength. Optimal welding conditions occur with sufficient energy to create a full bond but not so much to notably lower weld strength.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1829682
- Report Number(s):
- PNNL-SA-148355
- Journal Information:
- Science and Technology of Welding and Joining, Vol. 26, Issue 8
- Country of Publication:
- United States
- Language:
- English
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