The purpose of this study is to investigate the following items focused on the microstructure near the fusion boundary of dissimilar weld joint with Ni-based weld metal and low alloy steel; (1) Microstructural characteristics near the fusion boundary, (2) Dominant factor that makes crack retardation near the fusion boundary. Main conclusions can be summarized as follows; (1) From the results of CBB tests, it has been understood that the low alloy s teel has no SCC susceptibility and that there is a differ...
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SCC propagation and cessation behavior near the fusion boundary of dissimilar weld jointwith Ni-based weld metal and low alloy steel

SCC behavior near the fusion boundary of dissimilar weld joint with Ni-based weld metal and low alloy steel in high temperature water has been investigated with special attention on relation t o the characteristics of microstructure. From the results of CBB test (1.0 ppm-Na2SO4 and 8 ppm dissolved oxygen), it has been obvious that the LAS has no SCC susceptibility. On the other hand, Alloy182 in the weld samples have SCC susceptibility. Most of crack tips have located at the fusion boundary, and the penetr...
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Characteristics of microstructure and SCC behavior near the fusion boundaryof Ni-base weld metal and low alloy steel

Ferromagnetic materials have the interaction between mechanical and magnetic fields which is called magnetoelastic coupling. Also it is known that magnetic properties of ferromagnetic materials depend on plastic deformation. There are various kinds of Non-Destructive Testing (NDT) based on these phenomena for estimation of stress and plastic deformation. We propose a new analytical method of magnetic hysteresis curve, in which the saturation magnetic hyste resis curve is decomposed to neutral magnetization...
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Estimation of Stress and Plastic Deformation of SS400 SteelUsing Magnetic Properties

If leak trouble occurs at nuclear fuel reprocessing facility, repair welding procedure with short constructi on period is necessary to keep the safety of facility. As repair welding procedures, build-up welding proce dure and cover plate welding procedure have been developed. To get a good quality of repair welding joint wi thout lack of fusion and burn through into inside, heat box control is applied to these welding procedures....
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Development of welding repair procedures for nuclear fuel reprocessing facility