Weld Defects
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Quantification of Discontinuities in Welded Joints Using Gamma Tomography
Gamma tomography was used in this work to evaluate the recurrent defects in welding processes in naval steel sheets. It was used a first-generation equipment consisting of a source of Cesium-137, with activity of the order of 200 mCi, coupled to a Thallium-doped Sodium Iodide detector, NaI (Tl). For the study, specimens were produced in ASTM A131-AH36 steel
Mat. Res.. Publicado em: 20/12/2019
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2. Effect of Welding Heat Input on the Microstructure and Mechanical Properties of Dissimilar Friction Stir-Welded Copper/Brass Lap Joint
Dissimilar lap welded joints of copper and brass metals were fabricated by friction stir welding (FSW) method at various welding heat inputs. The effect of welding heat inputs on the microstructure and mechanical properties of overlap welded joints at at two different join configurations (i.e. Advancing side and Retreating side joint configurations) was inve
Mat. Res.. Publicado em: 26/08/2019
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3. Escolha das Energias de Soldagem para Aplicação na Técnica da Dupla Camada na Soldagem do Aço ASTM 131 Grau AH 36
Resumo Durante o processo de soldagem o aço microligado ASTM A131 Grau AH36 pode apresentar defeitos oriundos dos ciclos térmicos (distorções) que demandarão procedimentos onerosos como o tratamento térmico pós-soldagem. Somando-se a isto, este aço não é indicado a sofrer normalização, normalização seguida por revenimento, ou por têmpera e rev
Soldag. insp.. Publicado em: 09/05/2019
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4. Effect of Preheating on Microstructure and Tensile Properties of Friction Stir Welded AA7075 Aluminium Alloy Joints
ABSTRACT The high strength AA7075 aluminum alloy is commonly used in the aerospace components due to its exclusive mechanical properties like lightweight and high strength. This alloy cannot be welded by fusion welding techniques due to solidification cracking which severely degrade the mechanical properties of the joint. In contrast, through friction stir w
Braz. arch. biol. technol.. Publicado em: 23/01/2017
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5. Influence of welding parameters and post-weld aging on tensile properties and fracture location of AA2139-T351 friction-stir-welded joints
Tensile properties and fracture location of AA2139-T351 friction stir welded joints are studied in the as-welded and post-weld aged condition. The experimental results show that when the joints are free of welding defects, they fail on the advancing side of the HAZ exhibiting a large amount of plastic deformation. When the revolutionary pitch exceeds a thres
Mat. Res.. Publicado em: 25/06/2013
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6. Effect of the mechanical properties and mode loading on the mechanical behaviour of weldment: a numerical analysis
Welding is used to realize permanent assembly in mechanical structures to assure the continuity of the parts to be assembled contrary to the other assembly techniques which have physical or chemical discontinuities. Generally, crack evolution depends on several intrinsic and extrinsic parameters of material. The aim of this work is to analyse the severity of
Mat. Res.. Publicado em: 07/05/2013
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7. Occurrence of Defects in Laser Beam Welded Al-Cu-Li Sheets with T-Joint Configuration
Abstract: In the aerospace industry, laser beam welding has been considered as one of the most promising routes among the new manufacturing processes. Substitution of riveting by laser beam welding of aircraft structures has contributed to weight and cost savings. Concurrently, new aluminum alloys have been developed with the addition of lithium with better
J. Aerosp. Technol. Manag.. Publicado em: 2012-12
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8. âRevestimento por soldagem MIG/MAG empregando ligas de nÃquel para apliacaÃÃes em componentes do setor de petrÃleo e gÃs naturalâ / Gmaw Welding Overlay Of Nickel-Based Alloys For Applications In Oil And Natural Gas Components
The weld overlay of nickel-based alloys is an alternative often used in oil and gas industry to prevent corrosion in pipes and equipments operating under severe conditions. In many situations the requirements of weld overlays are based in a maximum of 5% iron content in the weld metal to ensure corrosion resistance. The aim of this study was to determine the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2010
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9. Consideraciones termodinámicas entre la formación de poros y la presión hidrostática durante la soldadura subacuatica mojada
The pores and cracks formations in weld bead during underwater wet welding are the main cause that prevent to reach the required mechanical properties of the weld metal. These defects are closely associated with the decomposition of the water molecule under conditions of electric arc. In this paper the thermodynamic calculations of the complex process of the
Soldagem & Inspeção. Publicado em: 2009-06
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10. Monitoração e localização de defeitos na soldagem TIG utilizando técnicas de espectrometria
There is an effort made by industries to improve product quality and production methods, and to decrease the production costs. Welding is one of these processes. There are several studies about controlling or monitoring the welding process. This work presents a on-line non-intrusive monitoring system capable of detecting TIG weld defects. In this way, inspec
Publicado em: 2008
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11. Monitorização e localização de defeitos na soldagem tig através do sensoriamento infravermelho
This work presents, in an exploratory form, the use of infrared emissions of the TIG arc as a parameter for process monitoring, detection and localization of defects or discontinuity during welding. A infrared sensor was used for focalizing part of the arc and weld pool and transformed the intensity of infrared radiation presented in the surrounding regions
Publicado em: 2008
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12. STRUCTURAL ASSESSMENT OF PIPELINES WITH BLUNT CORROSION DEFECTS COINCIDENT WITH LONG-SEAM WELDS / AVALIAÇÃO ESTRUTURAL DE DUTOS COM DEFEITOS DE CORROSÃO COINCIDENTES COM A SOLDA LONGITUDINAL
One of the most important issues that affects pipeline integrity is corrosion-caused metal loss. This type of defect can occur over the pipe body, seam or girth welds or even on heat affected zones. Pipeline remaining strength criterions are restricted or even prohibited for assessing corrosion defects coincident with weld regions. This present work investig
Publicado em: 2007