• Title/Summary/Keyword: welded component

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Fatigue Strength Evaluation of Butt Welded Aluminum Alloy Component for Railway Vehicles (철도차량용 대형 알루미늄 압출재 용접부의 피로강도 평가)

  • 한승우;이학주;이상록
    • Proceedings of the KSR Conference
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    • 2000.05a
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    • pp.242-249
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    • 2000
  • The fatigue strength of welded aluminum alloy component has been evaluated. Extruded aluminum alloy component Al 6005-T6 was considered. That component could be one of appropriate candidates for floor structure in railway cars. Finite element analysis has been performed to obtain stress distribution in the welded aluminum component. The results of finite element analysis have been applied in designing the experimental setup for fatigue strength evaluation of welded component. Three point bending fatigue test has been employed, until fracture occurs, to evaluate the fatigue strength of the welded component. In addition, the fatigue strength of the component has been compared with that of specimen.

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Characterization of the main component of equal width welded I-beam-to-RHS-column connections

  • Lopez-Colina, Carlos;Serrano, Miguel A.;Lozano, Miguel;Gayarre, Fernando L.;Suarez, Jesus M.;Wilkinson, Tim
    • Steel and Composite Structures
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    • v.32 no.3
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    • pp.337-346
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    • 2019
  • The present paper tries to contribute fill the gap of application of the component method to tubular connections. For this purpose, one typical joint configuration in which just one component can be considered as active has been studied. These joints were selected as symmetrically loaded welded connections in which the beam width was the same as the column width. This focused the study on the component 'side walls of rectangular hollow sections (RHS) in tension/compression'. It should be one of the main components to be considered in welded unstiffened joints between I beams and RHS columns. Many experimental tests on double-sided I-beam-to-RHS-column joint with a width ratio 1 have been carried out by the authors and a finite element (FE) model was validated with their results. Then, some different analytical approaches for the component stiffness and strength have been assessed. Finally, the stiffness proposals have been compared with some FE simulations on I-beam-to-RHS-column joints. This work finally proposes the most adequate equations that were found for the stiffness and strength characterization of the component 'side walls of RHS in tension/compression' to be applied in a further unified global proposal for the application of the component method to RHS.

A study on the strength characteristics of welded joints in aluminum carbody of rolling stock (알루미늄 철도차량 차체 용접부의 강도 특성에 관한 연구)

  • 서승일
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.290-292
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    • 2004
  • In this paper, static and fatigue load tests for the specimens, components and carbody were carried out to investigate the strength of welded joints in aluminum rolling stock. Tensile load test results showed that the static strength of welded joint for heat-treated alloys is reduced significantly and fatigue strengths are scattered by the welding imperfections. Component and whole carbody fatigue test results showed agreements with the design fatigue strength standards for specimens of same joint detail. Test results revealed that full penetration welding and strict management of welding procedure are crucial for securing strength of welded joint in aluminum carbody.

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Optimization of Friction Welding for Motor Vehicle Safety Belts: Part 1-Mechanical Properties and Microstructure (수송차량 안전벨트용 모터축재의 마찰용접 최적화(1) - 기계적 특성 및 조직)

  • Kong, Yu-Sik;Ahn, Seok-Hwn
    • Journal of Ocean Engineering and Technology
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    • v.26 no.1
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    • pp.64-69
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    • 2012
  • Dissimilar friction welds were produced using 15-mm diameter solid bars of chrome molybdenum steel (KS SCM440) and carbon steel (KS SM20C) to investigate their mechanical properties. The main friction welding parameters were selected to ensure good quality welds on the basis of visual examination, tensile tests, Vickers hardness surveys of the bond area and HAZ, and macro-structure investigations. The specimens were tested as-welded and post-weld heat treated (PWHT). The tensile strength of the friction welded steel bars was increased to 100% of the SM20C base metal under the condition of a heating time of more than four seconds. Optimal welding conditions were n = 2,000 (rpm), HP = 60 (MPa), UP = 100 (MPa), HT = 5 (s),and UT = 5 (s), when the total upset length was 7.8 (mm). The hardness distribution peak of the friction welded joints could be eliminated using PWHT. The two different kinds of materials were strongly mixed to show a well-combined structure of macro-particles, with no molten material, particle growth, or defects.

A Study on The Strength Evaluation of welded Joints for Degraded Material (열화재 용접부의 강도평가에 관한 연구)

  • 정의정;윤한용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.705-710
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    • 2002
  • Welding is used not only during the shipbuilding, but also during the repairing of ships. While repairing of ships, it is inevitable to weld new materials with degraded materials. In this case, it is predicted that the strength of both the sections is not identical each other. In this study, the respective welded joints in terms of mechanical properties such as microstructure, mechanical strength and fatigue crack propagation, with the component obtained from the barge used for a long-term period, were analyzed. It was found that the material degradation had a significant effect on the welded joints. The fatigue crack propagation in welded sections showed a big difference. The rate of fatigue crack growth of degraded material for both heat affected zone and parent metal was faster than that of new material. By contrast, The result within identical materials showed that the heat-affected zone was slower than that of parent metal

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A Study on the Strength Evaluation of Welded Joints for Degraded Material (열화재 용접부의 강도평가에 관한 연구)

  • 정의정;윤한용;임명환;김태식
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.75-82
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    • 2002
  • Welding is used not only for the shipbuilding, but also for the repairing of ships. While repairing of ships, it is inevitable to weld new materials with degraded materials. In this case, it is predicted that the strength of both the sections is not identical each other. In this study, the respective welded joints in terms of mechanical properties such as microstructure, mechanical strength and fatigue crack propagation, with the component obtained from the barge used for a long-term period, were analyzed. It was found that the material degradation had a significant effect on the welded joints. The fatigue crack propagation in welded sections showed a big difference. The rate of fatigue crack growth of degraded material for both heat affected zone and parent metal was faster than that of new material. By contrast, the result from identical materials showed that the rate of fatigue crack growth of the heat-affected zone was slower than that of parent metal.

Thermal Stress Analysis in the Vicinity of Butt Welded Joiny of a Strip (순간가열(瞬間加熱)된 Strip의 과도적열응력해석(過渡的熱應力解析))

  • J.E.,Park;H.,Kim
    • Bulletin of the Society of Naval Architects of Korea
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    • v.10 no.1
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    • pp.15-20
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    • 1973
  • In this paper, it is desired to show a simplified analytical method in estimating the thermal stresses in the heat affected zone of butt welded joint. A finite strip as shown in Fig.1 is taken as a analytical model for stress analysis. Expressing the temperature distributions by Fourier series, the thermal stresses are obtained. From the numerical sample calculation, the following results can be obtained. (1) Thermal stresses can be estimated by the sujected method. (2) The stress component, which is parallel to the weld direction is the largest stress component in major part of the strip. (3) In obtaining a stress component for the engineering purpose, length of the strip can be treated as five times of the thickness with same degree of convergency.

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A Study on the Strength Characteristics of Welded Joints in Aluminum Carbody of Rolling Stock (알루미늄 철도차량 차체 용접부의 강도 특성에 관한 연구)

  • Seo Sung-Il
    • Journal of Welding and Joining
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    • v.23 no.1
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    • pp.35-40
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    • 2005
  • In this paper, static and fatigue load tests for the specimens, components and carbody were carried out to investigate the strength of welded joints in aluminum rolling stock. Tensile test results showed that the static strength of welded joint for the heat-treated alloy is reduced significantly and fatigue strength data are scattered by the welding imperfections. Component and whole carbody fatigue test results showed agreements with the design fatigue strength standards for specimens of the same joint detail. Test results revealed that full penetration welding and strict management of welding procedure are crucial for securing the strength of welded joint in aluminum carbody.

Study on the Forming of Tailor Welded T-Section (레이저 용접 판재의 T형 단면에의 적용 및 성형성 연구)

  • 김헌영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2000.04a
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    • pp.159-162
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    • 2000
  • Wrinkles and shape distortions are generated during the forming of B-pillar(or center pillar) which is a component of the automobile side-frame. The stretch flanging modes at the joining part of the B-pillar and the roof-rail or the side-still give rise to forming problems when taior-welded blanks are applied to the side-frames. The authors simplified B-pillar lower part to T shaped section to investigate the forming behaviors. Three of die step locations and two of blank types were tested to show the effects of weld line locations and edge conditions on he forming of tailor welded blanks. The heights of body wrinkles and the strain distribution in the stretch flanged area were measured and compared.

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Residual Stress Measurement on Welded Stainless Steel Specimen by Neutron Diffraction

  • Park, M.J.;Jang, D.Y.;Choi, H.D.
    • International Journal of Korean Welding Society
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    • v.1 no.1
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    • pp.39-43
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    • 2001
  • In this paper, the neutron diffraction is applied to the residual stress measurement on the 20mm-thick welded stainless steel plate ($100^{\circ}$$\times$100$mm^2$). The High Resolution Powder Diffractormeter of the Korea Atomic Research Institute The power of nuclear reactor was 24 MWt and the measured reflection in the 220 plane (2$\theta$ is $95^{\circ}$and wavelength is 1.8340 ${\AA}$ . The Poisson ratio of 0.265 and elastic constant of 211 GPa are applied to the calculation of stresses and strains. Three directional components such as normal, transverse, and longitudinal stresses are measured and the results show that the most of longitudinal stress is tensile and decreases, changing to compressive depending on the distance away from the welded spot. However, transverse component is changing from tensile to compressive along the depth of the welded point.

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