• 대한토목학회논문집
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• 제28권5A호
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• pp.665-672
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• 2008

본 연구에서는 교량이나 선박 등의 강구조물에서 널리 사용되고 있는 하중 전달형 십자형 필렛용접 시험편에 대해 피로시험을 실시하여, 용접 후처리 조건에 따른 피로강도를 분석하였다. 용접 후처리 방법으로는 Toe Grinding, TIG Dressing 및 Weld Profiling을 적용하였으며, 피로시험은 일정진폭 반복하중 하에서 실시하였다. 피로시험 결과 하중 전달형 십자형 필렛용접 시험편은 용접 후처리를 실시한 경우와 실시하지 않은 경우 모두에서 BS 피로설계기준의 F등급을 만족하는 결과를 나타내었다. 또한 용접 후처리 방법에 따른 피로강도의 향상 효과는 Toe Grinding, TIG Dressing, Weld Profiling 순서로 증가하는 것을 알 수 있었다.

• 한국해양공학회지
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• 제22권2호
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• pp.50-57
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• 2008

The effect of weld improvement on the corroded fatigue life of welded structures was investigated. Toe grinding, TIG dressing and weld profiling were used as the geometric improvement methods. Fatigue tests under the corroded condition in artificial seawater were carried out to investigate the corrosion fatigue behavior of API 2W Gr.50T steel plate produced by POSCO. The test results in weld improved conditions were compared with those in as-welded condition. The test results were also compared with the design curves in UK DEn Class F. Corroded fatigue life of weld improved specimens was longer than that of as-welded specimen. Especially, the corroded fatigue life exceeded the mean SN curve in air of UK DEn Class F.

• 한국해양공학회지
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• 제22권2호
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• pp.58-64
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• 2008

Large-scale tests of welded tubular K-joint sunder balanced in-plane bending braces were carried out to observe the fatigue behavior of the API 2W Gr.60 steel plate produced by POSCO. Toe grinding and weld profiling were used to improve the fatigue life of a tubular K-joint. The effects of the steel grade and chord wall thickness on the fatigue life were also investigated. The present results were compared with the UK DEn design curve.

• 대한조선학회논문집
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• 제46권4호
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• pp.417-423
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• 2009

This paper is concerned with the fatigue behaviour of welded joints by the notch stress approach. The actual welded shape is complex and 3-dimensional that may influence greatly the fatigue strength. The purpose of the paper is to present a way of modelling the actual weld bead shape by using a 3-D Laser scanner for experimental models of steel plates with longitudinal fillet welds, and applying its results to a proper notch stress method for the fatigue strength. The present approach to assess the fatigue strength is quite promising with application to a variety of welded joints and effects of weld profiling to fatigue strength.