559 resultados para Soldagem por Resistência Elétrica

em Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho"


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The oil extraction in deep waters sparked new areas of knowledge, the creation of engineering courses dedicated just to these processes and a wide field of analysisvoiding multiple impacts in case of faults, mainly the economic and environmental. This paper aims to show on the effects and causes of fatigue failure in steel tubes used for oil and gastransportation (linepipe), mainly caused by vortex induced vibrations, or VIV. To make this, through laboratory tests, it found trough the curve Stress versus Number of Cycles, and thus estimating that with a stress value of 350 MPa or less, the fatigue life cycle of the API 5CT T95 (1% Cr) pipe is estimated infinite. It could conclude that the analyzed material has good fatigue failure resistance for offshore use, taking into account only the influence of VIV's, since there are no stress concentrators

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Engenharia Mecânica - FEG

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Studies about structural integrity are very important when it desires to prevent disasters associated with flaws inherent in materials used in structural components. The welded joints in steel pipes used to conduction and distribution of oil and gas correspond to the regions most susceptible to flaw. Aiming to contribute to this research line, the present study was designed to assess experimentally the structural integrity of welded joints in steel pipes API 5L X70 used in pipeline systems. This assessment is given from tests of CTOD, whose aim is simulate in laboratory the real behaviour of crack from of his propagation on the welded joint obtained by high frequency electric resistance welding. In this case, the analyses are performed from specimens SE(B) obtained directly of steel pipe API 5L X70. The proposed methodology involves tests of CTOD at lower temperature, in order to assess the toughness of material in critical operation conditions. From performance of CTOD tests, was possible assess the toughness of welded joints in terms of quantity through CTOD parameter and in terms of quality from behaviour of curve load versus CMOD. In this study, also, sought to compare CTOD’s results obtained through rules ASTM E1820 (2008) and BS 7448 (1991). Although the two standards cited previously have adopted different parameters to calculated the value of CTOD, concluded that the values of CTOD tend to converge for a common value

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)