• Proceedings of the KWS Conference
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• 1999.10a
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• pp.327-330
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• 1999

• Bulletin of the Society of Naval Architects of Korea
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• v.27 no.4
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• pp.43-50
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• 1990

For constructing the steel structures of ship and automobiles etc, thin plate welding has been extensively used in recent years. However. the welding of plate produces welding deformation and residual stress which sometimes extremely harm to the safty of structure in the course of construction and operation. Therefore, in order to accurately prediet the welding deformation and residual stress, it is important to exactly analyze the distribution of temperature during welding in thin plate and take into account the moving effect of the heat source. In this paper, two dimensional unstationary heat conduction problemes of thin plate are formulated using an isoparametric finite element. After the development of the computer program, this method is applied to some specimens, and the analyzed results are compared with the experimental ones to confirm the usefulness of this method.

• Journal of Welding and Joining
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• v.8 no.2
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• pp.1-12
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• 1990

본 고에서는 알루미늄 점용접시의 용접품질 및 용접봉 수명에 미치는 요소와 점용접부 설계방법에 대하여 간략히 설명하였다. 점 용접방법은 알루미늄 뿐만 아니라 steel의 박판용접에도 많이 사용되고 있으며, 특히 최근 공정자동화에 맞추어 가장 쉽게 자동화할 수 있는 용접 방법 중의 하나이다. 그러나 아직까지는 용접품질을 보증할 수 있는 비파괴 검사방법이 없기 때문에 새로운 비파괴 검사방법 개발 혹은 컴퓨터를 이용한 용접품질 추적방법에 대한 많은 연구가 요청된다. 한편 용접부 설계 관점에서는 조그만 단순 시편이 아닌 설계구조물을 이용한 용접강도 해석방법에 대한 연구가 미약하므로 이에 대한 많은 연구도 요청되고 있다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.5
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• pp.589-596
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• 2010

In this study, we calculate the welding residual stresses for a butt-welded thin-walled plate by carrying out three-dimensional finite-element analyses. To study the effect of mechanical boundary conditions on the welding residual stresses, various boundary conditions are considered. The welding residual stresses obtained in the measurements and finite-element analyses are validated by comparing them with the welding residual stress profiles in the R6 code. The results of this study are used to analyze the influence of residual stress on the crack formation in thin-section weldments.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.12
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• pp.2703-2714
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• 2002

In this work, energy absorption characteristics and optimal welding space of spot-welded square hat type tube are investigated via quasi-static crush experiments and finite element (FE) analyses. A FE model reflecting the crush characteristics is established based on the experimentally observed crush mechanisms of specimens with welding spaces (20, 30 & 45 mm) and (25,40 & 55 mm) respectively for two specimen widths (60, 75 mm). The established FE model is then applied to other crush models of widths (50, 60 & 75 mm) with various welding spaces (20, 25, 30, 40, 45, 55, 75, 150, 300 mm) respectively. We examine the energy absorption characteristics with respect to the welding space for each specimen width. The outcome suggests an optimal spot welding space of square hat type thin-walled tube. Energy absorption is also presented in terms of yield strength of base metal, specimen thickness, width, and mean crushing force of spot-welded square hat type thin-walled tube.

• Proceedings of the KWS Conference
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• 1995.10a
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• pp.50-53
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• 1995

• Proceedings of the KWS Conference
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• 2003.05a
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• pp.287-289
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• 2003

• Proceedings of the KWS Conference
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• 2001.05a
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• pp.153-156
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• 2001

• Proceedings of the KWS Conference
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• 1995.04a
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• pp.46-49
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• 1995

• Proceedings of the KWS Conference
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• v.43
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• pp.46-48
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• 2004