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Yang, Jun-Seog;Heo, Nam-Su
- Transactions of the Korean Society of Mechanical Engineers A
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- v.34 no.1
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- pp.79-83
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- 2010
The conventional welding technique such as shield metal arc welding has been mostly applied to the piping system of the nuclear power plants. It is well known that this welding technique causes the overheating and welding defects due to the large groove angle of weld. On the other hand, the narrow gap welding(NGW) technique has many merits, for instance, the reduction of welding time, the shrinkage of weld and the small deformation of the weld due to the small groove angle and welding bead width comparing with the conventional welds. These characteristics of NGW affect the deformation behavior and the distribution of welding residual stress of NGW, thus it is believed that the residual stress results obtained from conventional welding procedure may not be applied to structural integrity evaluation of NGW. In this paper, the welding residual stress of NGW was predicted using the nonlinear finite element analysis to simulate the thermal and mechanical effects of the NGW. The present results can be used as the important information to perform the flaw evaluation and to improve the weld procedure of NGW.
https://doi.org/10.3795/KSME-A.2010.34.1.79 인용 PDF KSCI

Soh, Na-Hyun;Yang, Jun-Seok;Pyo, Chang-Ryul;Huh, Nam-Su
- Transactions of the Korean Society of Mechanical Engineers A
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- v.35 no.6
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- pp.635-642
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- 2011
It is well known that conventional welding techniques can result in welding defects due to the large groove angle of the weld. In this context, the narrow gap welding (NGW) technique is applied in the nuclear industry because of its inherent merits such as the reduction in welding time and the shrinkage of the weld, and the small deformation of the weld resulting from the small groove angle and welding bead width. In this paper, the distribution of welding residual stress and deformation behavior of the ER308L weld due to NGW are predicted through nonlinear two-dimensional finite element analysis, in which the actual NGW process is simulated in detail. In particular, the effects of the shape of weld, i.e., the width of the weld and the shape of the welding groove, on the residual stress are investigated. The present results can be used to assess the integrity of defective nuclear components and to improve the welding process.
https://doi.org/10.3795/KSME-A.2011.35.6.635 인용 PDF KSCI

한국축산물위생처리협회
- 한국축산물위생처리협회지
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- no.52
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- pp.1-2
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- 2003
2003년도 정기총회 개최 - 경남-돼지고기 수출 '물꼬', 몽골에 6000톤 계획 - 서울축공 도축수수료 인상 - 축산물 전자상거래업체-매출규모 확대 꾸준 - 의무도축 확대실시, 개선방안 추진
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