A Study on Occurrence and Prevention of Defects of Electron Bean Welding (Report No.1)

Watanabe, Kiyoshi; Shida, Tomohiko; Suzuki, M.; Okamura, Hisanori

doi:10.2207/qjjws1943.43.678

Cited by 2 publications

(1 citation statement)

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“…It is also widely used in industry and in research. 3) On the latter, several series of studies have been conducted by Watanabe, Shida et al (technical investigation on occurrence and pre-vention of weld defects), [9][10][11][12][13][14] Irie, Hashimoto et al (phenomenological studies on the penetration depth), [15][16][17][18][19][20][21] and Irie and Tsukamoto (formation mechanisms of defects). 5,6) Since then, studies on the applicability to thick plates have continued and important welding parameters related to the heat input conditions and the beam control methods, such as acceleration voltage, beam current, focal length and beam oscillation, have been reported.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (III)

Asano¹,

Maeda

Aritomi

2006

Journal of Nuclear Science and Technology

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Overpack, a high-level radioactive waste package for Japan's geological disposal program, is required to isolate the sealed vitrified waste from contact with groundwater for 1,000 years. In this study, EBW (Electron Beam Welding), a typical application of high energy density beams widely used in various industries, was examined for its applicability to sealing a carbon steel overpack lid with a thickness of 190 mm. Welding conditions and welding parameters were examined for single-pass welding in a narrow area for three different penetration depths. Weld joint tests including macro-and microstructure, and mechanical properties were conducted and assessed within tentatively applied criteria for weld joints. Measurement and numerical calculation for residual stress were also conducted and the tendency of residual stress distribution was discussed. These test results were compared with the basic requirements of the welding method for overpack, which were pointed out in our first report. The induced void and cold shut inside the weld joint and surface roughness were also discussed for their improvement and evaluation, which need to be established to assure the long-term integrity of overpack lid closure.

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Section: Introductionmentioning

confidence: 99%