Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
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ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)
  Vol.5 No.4(Feb-25)
Vol.5 No.3(Nov-25)
Vol.5 No.2(Aug-26)
Vol.5 No.1(May-27)
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Featured Articles
EJAM5-3NT58 "Development of Future Prediction of Animation by coupling of Principle Component Analysis and Singular Spectrum Analysis"
EJAM5-3NT58 Validation of Multifrequency and Window-Multifrequency Techniques using Remote Field Eddy Currents for ISI of FBR Tubes
EJAM5-3NT59 Remote Controlled Robot with expandable features

(in English)

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.



Fig. 1 Work of underwater welding

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

Japan Society of Maintenology (