• Title/Summary/Keyword: Fillet welding

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Evaluation of Mechanical Test Characteristics of Fillet Welding (필릿 용접의 기계적 시험 특성 평가)

  • Cho, Byung-Jun;Lee, Soung-Jun;Rhim, Jong-Guk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.2
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    • pp.535-541
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    • 2020
  • FCAW is used mainly in the welding of carbon steel and alloy steel because it can be welded in all positions and can obtain excellent quality at sites with variable working conditions. Recently, many studies in Korea have estimated the fatigue strength, residual stress, and deformation, and to develop a fillet welding process. On the other hand, there have been few studies of the mechanical properties based on the strength, macro and magnetic particle test results for fillet welding. This study shows the following results through fillet welding, macro testing and strength testing using SM490A (solid-structure rolled steel) for thick plates using SS400 (rolled steel) for the upper plate and FCAW. The hardness test, macro test and magnetic particle test were then conducted. The hardness tests showed that all result values were smaller than the KS B 0893 standard values of 350Hv. The macro-test showed that each type of welded part was in a normal organic state and that there were no internal errors, bubbles, or impurities on the front of the welded part. Therefore, there were no concerns about lamination. The magnetic particle examination showed no problems.

A study on welding connection's fatigue analysis through numerical and experimental approaches (용접이음부의 피로강도 해석을 위한 수치해석과 실험과의 비교연구)

  • 조규남;하우일
    • Computational Structural Engineering
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    • v.6 no.3
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    • pp.113-123
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    • 1993
  • Most of the ship structures and offshore structures are constructed through the welding and they are always subjected to variable loads. In this study, fatigue and stress concentration of the various types of welding connections due to the variable loads are investigated by using numerical approach, and comparisons between numerical analysis and experiments are performed. Fillet weld, full penetration weld and partial penetration weld characteristics are studied by using parameters such as penetration length, welding leg length, size and penetration angle. Based on this study, it is suggested that the fillet welding can be replaced with the penetration welding in some cases. The results of this study can be used as guidelines for actual welding problems in the shipyards.

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Development of Simple Prediction Model for Fillet Welding Deformation (필릿 용접변형에 대한 간이 예측 모델 개발)

  • 김상일
    • Journal of the Society of Naval Architects of Korea
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    • v.40 no.2
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    • pp.49-56
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    • 2003
  • The welding deformation of a hull structure in the shipbuilding industry is Inevitable at each assembly stage. The geometric inaccuracy caused by the welding deformation tends to preclude the introduction of automation and mechanization and needs the additional man-hours for the adjusting work at the following assembly stage. To overcome this problem, a distortion control method should be applied. For this purpose, it is necessary to develop an accurateprediction method which can explicitly account for the influence of various factors on the welding deformation. The validity of the prediction method must be also clarified through experiments. This paper is aimed at deriving the simple prediction model for fillet welding deformations. For this purpose, the thermal elasto-plastic analysis varying the welding conditions and plate thickness has been performed. On the basis of numerical results, the formulae for angular distortion and transverse shrinkage have been derived through the regression analysis. Experimental work has been also carried out to clarify the validity of numerical results. It has been found that the numerical results show a good agreement with those of experiments

A Study on Current Decision of Lead-Trailing Torch for Defect Improvement in Tandem Fillet Welding (탄뎀 필릿용접 불량개선을 위한 선후행 토치의 전류 결정에 관한 연구)

  • 박대규;양종수;조상명
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.92-94
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    • 2004
  • 선박 건조 시 적용되는 여러 가지 용접기법 중 가장 많이 적용되는 기법 중 하나가 FCA용접 (Flux Cored Arc Welding)이다. 일반적으로 100% $CO_2$ 가스를 사용하고, 플럭스 코어드 와이어를 사용하여 자동 또는 반자동 용접에 적용한다. (중략)

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On the Fillet Weld-Induced Deformation Control by Applying the Tensioning Method (장력법을 적용한 필릿용접변형 제어에 관한 연구)

  • Lee, Joo-Sung;Kim, Cheul-Ho
    • Journal of Welding and Joining
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    • v.27 no.4
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    • pp.38-43
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    • 2009
  • As it has been well appreciated, the weld-induced deformation control is one of the most important issues from view point of efficiency in ship production. The weld-induced deformation is more serious in the case of thin plate block than in the case of relatively thick plate block, since, for example, heat affect zone of thin plates is wider than that of thick plates for the same heat input. Among weld-induced deformation, buckling deformation due to shrinkage and residual stress in weld line direction is one of the most serious deformation type. This paper is concerned with the controling the buckling deformation of thin plate fillet weld by applying the tensioning method. Weld experiments have been carried out for specimens with varying the magnitude and direction of tension load. The results are graphically represented to show the effect of tensioning method upon reducing the weld-induced deformation. From the present findings, its has been seen that tensioning method is one of the useful ways to control the weld-induced deformation of fillet weld of thin plates.

Effect of leg of fillet on stress distribution in weldments of large steel water pipes (수도용 대형 강관 용접부의 응력분포에 미치는 각장(leg of fillet)의 영향)

  • 김성도;배강열;나석주
    • Journal of Welding and Joining
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    • v.10 no.3
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    • pp.54-62
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    • 1992
  • Large steel water pipes are joined prevalently by bell and method and welded at inside and outside of lapped parts. According to the Korean Standard(KS) for fabrication of water pipes, the weldments are designed to have the length of leg which is same as or larger than the thickness of the pipe. It is recently pointed out that the standard size of weldments is too large, which results in an excessive consumption of material and labor. In this study, several cases of weldments having different sizes were investigated to reduce the length of leg to the effective size. For each case, the analysis of stresses was carried out to evaluate the safety of the welded pipes by using a package program, ANSYS, under the consideration of the loading condition of water pipes which includes the soil pressure on the pipe, the load over the road, and temperature change of the pipe. The results of this study revealed that the weldment which has the length of leg of the size over 0.7*thickness of the pipe could provide a stress level below the yield strength. Especially when the length of leg is 85% of the wall thickness, the maximum equivalent stress is only slightly higher than that of the leg of fillet of the size of 1.0*pipe thickness.

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