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Hammad, F. H.
- Ferrite Content and Morphology of Type 308 Stainless Steel Weld Metal
Authors
1 Office of Inspection and Enforcement, U.S. Nuclear Regulatory Commission, Washington, D.C., US
2 Atomic Energy Establishment, Cairo, EG
Source
Indian Welding Journal, Vol 20, No 1 (1988), Pagination: 306-311Abstract
The variations of both ferrite number (FN) and morphology of Type AISI 308 deposited weld metal were studied. The predicted means of population of FN values at the top, transverse and longitudinal sections were estimated as 7, 5 and 5, respectively. The variation in FN values was attributed to various reasons such as the orientation of ferrite phase from section to section, weld metal solidification rate, cooling rate, and the dissolution of the ferrite phase due to subsequent thermal cycles in a multipass weld metal.
The morphology of the ferrite phase was investigated metallographically and found to vary from bead to bead. Three different morphologies were distinguished, namely vermicular, lacy and globular.
- Welding Zircaloy Thin Tubes to End Plugs
Authors
1 Dept. of Metallurgy, Atomic Energy Establishment, Cairo, EG
2 Dept. of Metallurgy, Atomic Energy Establishment, Cairo, EG
Source
Indian Welding Journal, Vol 18, No 1 (1986), Pagination: 15-20Abstract
This work aimed at optimizing parameters while welding Zircaloy-2 tubes with end plugs, as a simulation of a part of the fabrication of the nuclear fuel pins. Samples were welded by Tungsten Inert Gas arc welding (TIG) process under controlled atmosphere of pure argon. Some samples were welded using Electron Beam (EB) welding process.
For samples welded using TIG process both the design of the welding chamber (size and tightness), and the purity of the shielding atmosphere were found to have appreciable effect on the quality of the welded joint. Increasing the arc length and/or the welding current increases grain growth and extends both fusion and heat-affected zones. However, heat input (arc length and welding current) must be high enough to give complete penetration welds. Optimum arc length of 1.2 mm was found to give good welds with the smallest possible heat-affected zones.
Optimum parameters of EB welding process (vacuum, welding current and EB amplitude) were determined. Welds prepared by EB welding were found to have finer grain size and less extended fusion and heat-affected zones.
Welds prepared by both TIG and EB processes were inspected visually, metallographically and by using X-ray radiography. Welds integrity were tested using helium leak and pressure tests.