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  Vol.3 No.3 (Nov-25)
Vol.3 No.2 (Aug-25)
Vol.3 No.1 (May-25)
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EJAM2-4NT29_Fig.4_Model_of_Drive_Force_Transmission_Mechanism_of_Motor-Operated_Valve CBM of Motor-Operated Valves in NPPs
EJAM2-4NT30_Fig.4_CBR_operation_schedule Replacement Operation Schedule Management of Main Control Boards
EJAM2-4NT31_Fig.3_Schematic_drawing_and_photo_of_prototype_in-pile_crack_growth_test_rig Current Status of Tec. Dev. of In-pile Tests for IASCC
EJAM2-4NT32_Fig.1_Schematic_diagram_of_TiO2_injection SCC mitigation method by TiO2 technique

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Vol.1 No.1 NT3 (May, 2009) Sheet B
Underwater TIG Seal-welding EJAM(1-1-NT3-Sheet B) Underwater TIG Seal-welding
 
 
After local gas phase space is formed in the water, under water TIG weld is processed in that gas phase space. The welding method is TIG welding which is broadly used and has a higher heat input than that of laser welding.

However, if the condition of welding process is selected in broader range, high quality and stable welding process is possible and expected to be highly reliable crack seal welding procedure.

An appearance of welding bead and bead section after underwater welding procedure, are shown in Fig. 2. From this figure, it is confirmed that good welding is possible in the water.

Figure1

Figure2
Fig. 1 Work of underwater welding

Fig. 2 Welding mock up test result
(base metal : Alloy600)
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