Spelling suggestions: "subject:"[een] WELDABILITY"" "subject:"[enn] WELDABILITY""
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APPLICABILITY OF COLD METAL TRANSFER FOR REPAIR OF DISSIMILAR METAL WELDS IN STAINLESS STEEL PIPING IN NUCLEAR POWER PLANTSDaniels, Thomas W. 20 May 2015 (has links)
No description available.
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Metallurgical Characterization and Weldability Evaluation of Ferritic and Austenitic Welds in Armored SteelsDuffey, Matthew James 23 September 2016 (has links)
No description available.
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Repair weldability of heat-resistant stainless steel casings-HP45NB, HP50NB and 20-32NB alloysShi, Shu 15 March 2006 (has links)
No description available.
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Ultrasonic metal welding: the weldability of stainless steel, titanium, and nickel-based superalloysBloss, Matthew C. 07 January 2008 (has links)
No description available.
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Friction Stir Processing of Nickel-base AlloysRodelas, Jeffrey M. 13 August 2012 (has links)
No description available.
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[en] WELDABILITY ANALISES OF API 5L X-80 STEEL USING TEKKEN TEST AND IMPLANT TEST / [pt] ANÁLISE DA SOLDABILIDADE DO AÇO API 5L X-80 POR MEIO DOS TESTES TEKKEN E DE IMPLANTEGISELLE CALOI 28 October 2008 (has links)
[pt] Este trabalho apresenta um estudo da soldabilidade do aço
API 5L X-80
utilizando os Testes Tekken e de Implante. A pesquisa
avalia a soldabilidade do
aço X-80 para a soldagem circunferencial com eletrodo
revestido e arame tubular
com relação à formação de trincas induzidas por
hidrogênio.
O objetivo é
viabilizar diferentes opções de processos de soldagem
para
o aço em questão. Para
o Teste Tekken foram soldados dois pares de chapas pelo
processo SMAW
utilizando o consumível E8010-G e mais dois pares pelo
processo FCAW-G com
o consumível E101T1-GM-H8. Para o Teste de Implante foram
utilizados três
chapas de suporte e dez implantes, sendo que quatro
implantes foram soldados
pelo processo SMAW com E8010-G e seis pelo processo FCAW-
G
com E101T1-
GM-H8. Todos os implantes apresentavam 6 mm de diâmetro.
Para todos os testes
a temperatura de preaquecimento foi de 100°C. A
quantidade
de hidrogênio
difusível nos metais de solda produzidos pelos dois
consumíveis foi medida pelo
processo de Cromatografia Gasosa. Após a realização dos
testes, todas as
amostras foram observadas sem e com ataque no MO e no MEV
para que as
trincas induzidas por hidrogênio na ZTA e no MS (no caso
do
Teste Tekken)
pudessem ser analisadas e medidas. A partir desse
procedimento foi possível
observar que todas as amostras apresentaram trincas
transgranulares com
comprimentos da ordem de 17,68 um, muito pequenas e
improváveis de serem
prejudiciais ao aço. Isso possibilita dizer que o aço X-
80
pode ser soldado
utilizando os consumíveis avaliados, sem riscos de danos
maiores para o material. / [en] This work shows a study of the weldability of API 5L X-80
steel using the
Tekken Test and the Implant Test. The research analises the
weldability of HSLA
X-80 steel for orbital circunferencial welding with the
Shielded Metal Arc Weld
and the Flux Core Arc Weld processes with regard to
hydrogen induced cracking
formation. The aim is to make feasible different options of
welding process for the
steel at issue. For the Tekken Test two pairs of plates
were welded by SMAW
process using E8010-G consumable and two more pairs by FCAW-
G process
using E101-T1-GM-H8. The Implant Test used three base
plates and ten implants,
being four implants welded by SMAW process and with E8010-G
consumable
and six by FCAW-G process with E101T1-GM-H8 consumable. All
the implants
have 6 mm of diameter. For all tests the preheating
temperature was 100°C. The
diffusible hydrogen content deposited by both consumables
was measured by the
Gas Chromatography Method. After the tests all the samples
were examined
without and with attack by means of optical microscope and
SEM to allow
hydrogen induced cracking in the HAZ and in the weld metal
(for Tekken Test) to
be viewed and measured. By means of this procedure it was
possible to observe
that all samples showed transgranular cracking with length
of 17,68 um, too small
and unlikely to the be bad to the steel. It allows saying
that X-80 steel can be
welded using the consumables tested, without a risk of
damage of the material.
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Soldabilidade metalúrgica do aço ASTM A553 tipo I com 9% de níquel. / Metallurgical weldability of ASTM A553 Type I steel with 9% nickel.Jaime Casanova Soeiro Junior 06 December 2017 (has links)
A soldagem altera as propriedades mecânicas dos aços ligados ao níquel, em especial seu desempenho em aplicações criogênicas. Assim, este trabalho apresenta um estudo sobre a soldabilidade metalúrgica do aço com 9% níquel e tem como objetivos: identificar se a fragilização em temperatura abaixo da temperatura Ac3 ocorre em ZACs com dois e três ciclos térmicos simulados fisicamente; analisar as características da junta soldada pelo processo de soldagem por atrito linear com mistura e os efeitos da soldagem multipasse; e analisar a influência dos passes de enchimento e acabamento sobre o comportamento mecânico da ZAC da raiz de uma junta soldada pelo processo de soldagem MIG/MAG. Destacam-se entre os resultados da simulação física da ZAC: as amostras que tiveram a temperatura máxima abaixo da temperatura Ac1, no terceiro ciclo térmico, não apresentaram o efeito de redução da energia absorvida no ensaio Charpy V; a fração volumétrica de austenita retida não aumenta a quantidade de energia absorvida no ensaio Charpy V para as amostras que tiveram a temperatura máxima do segundo ciclo térmico abaixo da temperatura Ac3 (723°C); e a correlação linear múltipla sugere um modelo empírico, baseado nos dados deste trabalho, onde os fatores de fração volumétrica do microconstituinte martensita-austenita, fração volumétrica de austenita retida e tamanho de grão são mais relevantes para a quantidade de energia absorvida no ensaio Charpy V. Destacam-se entre os resultados da soldagem por atrito linear: a energia absorvida no ensaio Charpy V da zona misturada do primeiro cordão (CP1) é menor que o metal de base; o segundo cordão gera duas regiões na zona misturada do primeiro cordão, que tendem a aumentar a energia absorvida no ensaio Charpy V; os valores de energia absorvida no ensaio Charpy V apresentam correlações lineares simples com a microdureza, a fração volumétrica do microconstituinte martensita-austenita e com o tamanho de grão. Destacam-se entre os resultados da soldagem com MIG/MAG: A soldagem do aço com 9% de níquel com a liga Inconel 625 gera uma zona não misturada entre o metal de solda e a ZAC; a amostra com todos os passes de solda (CP3) apresenta a menor energia absorvida no ensaio Charpy V entre todos os experimentos; e a trinca, no ensaio Charpy V, propaga na zona não misturada no CP1 e no CP2, que tiveram as maiores energias absorvidas no ensaio Charpy. O CP3 apresenta propagação de trinca na linha de fusão e possui a menor energia absorvida no ensaio Charpy V. / Welding modify the mechanical properties of nickel steels, especially their performance in cryogenic applications. Thus, this work presents a study on the metallurgical weldability of 9% nickel steel and its objectives are: identify if the embrittlement in temperature below the Ac3 temperature occurs in HAZs with two and three thermal cycles simulated physically; analyze the characteristics of the joint welded by friction stir welding process and the effects of multipass welding; and analyze the influence of the filling and finishing passes on the mechanical behavior of HAZ from the root of a joint welded by the GMAW welding process. The results of the physical simulation of the HAZ were: the samples that had the maximum temperature below the temperature Ac1, in the third thermal cycle, did not present the effect of reduction of the energy absorbed in the Charpy V test; the retained austenite volumetric fraction does not increase the amount of energy absorbed in the Charpy V test for the samples having the maximum temperature of the second thermal cycle below the Ac3 temperature (723 °C); and the multiple linear correlation suggests an empirical model, based on the data of this work, where the volumetric fraction factors of the martensite-austenite microconstituent, retained austenite volumetric fraction and grain size are more relevant for the amount of energy absorbed in the Charpy V test. The FSW welding highlights results: the energy absorbed in the Charpy V test of the mixed zone of the first pass (CP1) is smaller than the base metal; the second pass generates two regions in the mixed zone of the first pass, which tend to increase the energy absorbed in the Charpy V test; the values of energy absorbed in the Charpy V test show simple linear correlations with the microhardness, the volumetric fraction of the martensite-austenite microconstituent and with the grain size. The GMAW welding highlights results: welding of the steel with 9% nickel with the Inconel 625 alloy makes an unmixed zone between the weld metal and the HAZ; the sample with all weld passes (CP3) shows the lowest energy absorbed in the Charpy V test among all the experiments; and the crack, in the Charpy V test, propagates in the unmixed zone in CP1 and CP2, which had the highest energies absorbed in the Charpy test. The CP3 shows crack propagation in the melting line and has the lowest energy absorbed in the Charpy V test.
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Soudage d'alliages d'aluminium par la technologie Friction Stir Welding Bobbin Tool / Friction Stir Welding with Bobbin Tool of aluminium alloysGuerin, Baptiste jean patrice 04 March 2010 (has links)
Dans le domaine des matériaux métalliques, les techniques d’assemblage par soudageconduisent à des réductions de masse et de coûts importantes susceptibles d’intéresserles industries aéronautiques. Néanmoins, les procédés de soudage classiquespar fusion ne s’appliquent pas aux dernières générations d’alliages d’aluminium aéronautiques.Dans ce contexte, le procédé de soudage Friction Stir Welding présentedes atouts considérables, de nature à rendre compétitives les structures métalliquesface à la montée en puissance des matériaux composites.L’objectif de cette thèse est double. Il s’agit d’une part d’améliorer notre compréhensiondu procédé de soudage Friction Stir Welding Bobbin Tool puis dans undeuxième temps de proposer une méthodologie visant à prédire les paramètres desoudage optimaux.Afin de mener à bien ces objectifs, des essais de soudage ont été menés pour troisalliages d’aluminium aéronautique, incluant deux alliages d’aluminium-lihtium, etdeux épaisseurs, représentatives d’une jonction de peau de fuselage. Les résultatsd’essais ont par la suite été exploités et ont permis de mettre en évidence des corrélationsentre paramètres de soudage, température, puissance et malaxage du noyausoudé.Dans un troisième temps, afin de supporter la démarche expérimentale, des outilsde simulation ont été utilisés. Un modèle thermo-fluide local a été développé afinde simuler les phénomènes de malaxage dans le noyau soudé. A l’échelle globale, unmodèle thermique a permis de reproduire fidèlement les phénomènes de diffusion dela chaleur dans la structure. Enfin, le couplage des deux modèles a montré qu’il étaitpossible de simuler puis de prédire un domaine de soudabilité. / In the field of metallic materials, welding technologies can provide significantmass reductions and cost savings to aircraft industries. Nevertheless, classical fusionwelding processes can not be applied to last generations of aeronautical aluminiumalloys. In this context, Friction Stir Welding offers many advantages and can helpmetallic parts to face the build up of composite materials.This thesis has mainly two objectives. We aim first at improving our understandingof Friction Stir Welding with Bobbin Tool and then at proposing a kind ofmethodology able to predict optimal welding parameters.Welding trials were carried out using three aeronautical aluminium alloys includingtwo aluminium lithium and two thicknesses representative of a fuselagejunction. Results were analyzed and some correlations were found between weldingparameters, temperature and stirring of the weld nugget.This work was also supported by several modeling tools. A local thermo-fluidapproach has been used to simulate stirring of the material in the weld nugget. Aglobal thermal model has been used to simulate heat diffusion in the structure. Then,a coupled approach of these previous modeling tools shows that it was possible tonumerically predict a processing window.
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Soldabilidade metalúrgica do aço ASTM A553 tipo I com 9% de níquel. / Metallurgical weldability of ASTM A553 Type I steel with 9% nickel.Soeiro Junior, Jaime Casanova 06 December 2017 (has links)
A soldagem altera as propriedades mecânicas dos aços ligados ao níquel, em especial seu desempenho em aplicações criogênicas. Assim, este trabalho apresenta um estudo sobre a soldabilidade metalúrgica do aço com 9% níquel e tem como objetivos: identificar se a fragilização em temperatura abaixo da temperatura Ac3 ocorre em ZACs com dois e três ciclos térmicos simulados fisicamente; analisar as características da junta soldada pelo processo de soldagem por atrito linear com mistura e os efeitos da soldagem multipasse; e analisar a influência dos passes de enchimento e acabamento sobre o comportamento mecânico da ZAC da raiz de uma junta soldada pelo processo de soldagem MIG/MAG. Destacam-se entre os resultados da simulação física da ZAC: as amostras que tiveram a temperatura máxima abaixo da temperatura Ac1, no terceiro ciclo térmico, não apresentaram o efeito de redução da energia absorvida no ensaio Charpy V; a fração volumétrica de austenita retida não aumenta a quantidade de energia absorvida no ensaio Charpy V para as amostras que tiveram a temperatura máxima do segundo ciclo térmico abaixo da temperatura Ac3 (723°C); e a correlação linear múltipla sugere um modelo empírico, baseado nos dados deste trabalho, onde os fatores de fração volumétrica do microconstituinte martensita-austenita, fração volumétrica de austenita retida e tamanho de grão são mais relevantes para a quantidade de energia absorvida no ensaio Charpy V. Destacam-se entre os resultados da soldagem por atrito linear: a energia absorvida no ensaio Charpy V da zona misturada do primeiro cordão (CP1) é menor que o metal de base; o segundo cordão gera duas regiões na zona misturada do primeiro cordão, que tendem a aumentar a energia absorvida no ensaio Charpy V; os valores de energia absorvida no ensaio Charpy V apresentam correlações lineares simples com a microdureza, a fração volumétrica do microconstituinte martensita-austenita e com o tamanho de grão. Destacam-se entre os resultados da soldagem com MIG/MAG: A soldagem do aço com 9% de níquel com a liga Inconel 625 gera uma zona não misturada entre o metal de solda e a ZAC; a amostra com todos os passes de solda (CP3) apresenta a menor energia absorvida no ensaio Charpy V entre todos os experimentos; e a trinca, no ensaio Charpy V, propaga na zona não misturada no CP1 e no CP2, que tiveram as maiores energias absorvidas no ensaio Charpy. O CP3 apresenta propagação de trinca na linha de fusão e possui a menor energia absorvida no ensaio Charpy V. / Welding modify the mechanical properties of nickel steels, especially their performance in cryogenic applications. Thus, this work presents a study on the metallurgical weldability of 9% nickel steel and its objectives are: identify if the embrittlement in temperature below the Ac3 temperature occurs in HAZs with two and three thermal cycles simulated physically; analyze the characteristics of the joint welded by friction stir welding process and the effects of multipass welding; and analyze the influence of the filling and finishing passes on the mechanical behavior of HAZ from the root of a joint welded by the GMAW welding process. The results of the physical simulation of the HAZ were: the samples that had the maximum temperature below the temperature Ac1, in the third thermal cycle, did not present the effect of reduction of the energy absorbed in the Charpy V test; the retained austenite volumetric fraction does not increase the amount of energy absorbed in the Charpy V test for the samples having the maximum temperature of the second thermal cycle below the Ac3 temperature (723 °C); and the multiple linear correlation suggests an empirical model, based on the data of this work, where the volumetric fraction factors of the martensite-austenite microconstituent, retained austenite volumetric fraction and grain size are more relevant for the amount of energy absorbed in the Charpy V test. The FSW welding highlights results: the energy absorbed in the Charpy V test of the mixed zone of the first pass (CP1) is smaller than the base metal; the second pass generates two regions in the mixed zone of the first pass, which tend to increase the energy absorbed in the Charpy V test; the values of energy absorbed in the Charpy V test show simple linear correlations with the microhardness, the volumetric fraction of the martensite-austenite microconstituent and with the grain size. The GMAW welding highlights results: welding of the steel with 9% nickel with the Inconel 625 alloy makes an unmixed zone between the weld metal and the HAZ; the sample with all weld passes (CP3) shows the lowest energy absorbed in the Charpy V test among all the experiments; and the crack, in the Charpy V test, propagates in the unmixed zone in CP1 and CP2, which had the highest energies absorbed in the Charpy test. The CP3 shows crack propagation in the melting line and has the lowest energy absorbed in the Charpy V test.
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Perched water in fractured, welded tuff : mechanisms of formation and characteristics of rechargeWoodhouse, Elizabeth Gail. January 1997 (has links)
Perched water zones have been identified in the fractured, welded tuff in the semiarid to arid environments of Yucca Mountain, Nevada and near Superior, Arizona. An understanding of the formation of such zones is necessary in order to predict where future perched water might form at Yucca Mountain, the proposed site of a high-level nuclear waste repository. The formation or growth of a perched zone above a repository is one factor of the factors to be considered in the risk assessment of the Yucca Mountain site. The Apache Leap Research Site (ALRS) near Superior, Arizona is a natural analog to the Yucca Mountain site in terms of geology, hydrology, and climate. Perched water has been identified over an area of at least 16 km² in the Apache Leap Tuff, a mid- Miocene fractured, welded ash-flow tuff. A primary goal of this investigation was to characterize the physical and hydrologic properties of the tuff in the region above and including the perched zone, and to evaluate those characteristics to develop a model for a perching mechanism in the tuff. A second goal was to determine what fraction of water entering a watershed reaches the subsurface, to potentially recharge the perched zone. The Apache Leap Tuff has been subject to considerable devitrification and vapor phase crystallization, which dominate the character of the rock. With depth to the perched zone, pumice fragments become increasingly flattened and segregated; the pumice fragments are the primary locations of porosity in the rock, therefore porosity also becomes greatly reduced with depth, to the extent that the rock matrix is virtually impermeable at the perched water zone. Fractures are the primary pathways by which water moves through the rock; fracture hydraulic conductivity values were determined to be nine orders of magnitude greater than measured matrix hydraulic conductivity at the perched zone. An increase in fracture filling by silica mineralization beneath the perched zone reduces the secondary permeability, enhancing the formation of perched water. Thus, the primary mechanisms for the formation of the perched zone include fracture flow bringing water into the subsurface, combined with extremely low matrix hydraulic conductivity at depth, and reduced secondary permeability by filled fractures and lower fracture density. Water budgets were calculated for two years in a 51.4-ha watershed. Direct measurements were made of precipitation and runoff', evapotranspiration was both directly measured, and modeled based on measurement of a number of weather parameters. Infiltration was calculated as the residual of precipitation after runoff and evapotranspiration were removed. Infiltration was determined to be less than 10% of the annual water budget; evapotranspiration removes on the order of 90% of precipitation on an annual basis.
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