Laser De Gas
Mostrando 1-12 de 118 artigos, teses e dissertações.
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1. Systematic review and meta-analysis of welding procedures in one-piece cast implant-supported frameworks
Abstract The objective of this systematic review and meta-analysis was to evaluate the effect of welding techniques on implant-supported prostheses and determine whether they contribute to a better adaptation compared with a one-piece cast. A search was conducted using the PubMed/MEDLINE, Embase, and Cochrane Library databases, and articles published until N
Braz. oral res.. Publicado em: 25/11/2019
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2. Nickel-Titanium Alloys Welding of Thin Sheets Using GTAW: Comparative Study Between Similar and Dissimilar Welding with AISI 304 Stainless Steel
The objective of the present work was to evaluate welding of thin sheets (thickness < 1 mm) of similar and dissimilar NiTi alloys with AISI 304 stainless steel using the Gas Tungsten Arc Welding (GTAW) process and to study the mechanical and metallurgical properties of the joints with and without post-welding heat treatment (PWHT). The GTAW process was chose
Mat. Res.. Publicado em: 08/11/2018
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3. Gases de átomos Fermiônicos aprisionados por uma rede quase periódica e um potencial harmônico bidimensional
Resumo Neste trabalho, nós consideramos um modelo tridimensional dinâmico de um gás de férmions em um estado superfluido de Bardeen-Cooper-Schrieffer aprisionado por uma rede óptica quase periódica unidimensional e na presença de um potencial externo em forma de charuto. Através da aproximação variacional, estudamos a possibilidade de que o coefici
Rev. Bras. Ensino Fís.. Publicado em: 03/09/2018
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4. Espectro de gotas de uma ponta de pulverização em diferentes condições meteorológicas
RESUMO A aplicação de agrotóxico está sempre suscetível às perdas por evaporação e deriva das gotas pulverizadas. Com estas perdas do produto aplicado, menor será a quantidade de defensivo que atinge o alvo e, possivelmente, a eficiência do controle fitossanitário será prejudicada. Devido a estas preocupações, este estudo teve como objetivo ava
Rev. Ciênc. Agron.. Publicado em: 2018-09
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5. Characterization of Phase Transformations and Microstructural Changes in an API 5CT L80 Steel Grade During Ni Alloy Laser Cladding
The superficial coatings in micro-alloyed steel pipes has been a pointed way to decrease the corrosion problems in oil and gas industry. However, little emphasis has been given to the substrate. The effects of the deposition method on the steel microstructure and properties are still not well described. In this context, this work studied the effect of Ni sup
Mat. Res.. Publicado em: 26/07/2018
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6. Synthesis and Characterization of Niobium Carbide with Copper Addition Obtained Via Gas Solid Reaction
The use of niobium containing materials' has gained much attention of the scientific community in the late years due its various applications in diverse fields. NbC is a highly versatile material. Copper addition may alter several of its properties, such as morphology, crystal structure etc. as well as enhance its catalytic behavior. Nanostructured NbC with
Mat. Res.. Publicado em: 26/02/2018
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7. Evaluation of hydrogen-Induced cracking resistance of the In625 laser coating system on a C-Mn steel substrate
Abstract The corrosion of C-Mn steels in the presence of hydrogen sulfide (H2S) represents a significant challenge to oil production and natural gas treatment facilities. The failure mechanism induced by hydrogen-induced cracking (HIC) in a Inconel 625 coating / C-Mn steel has not been extensively investigated in the past. In the present work, an API 5CT ste
REM, Int. Eng. J.. Publicado em: 2017-06
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8. Algoritmo de Extração das Características da Junta para Sensores de Triangulação Laser Aplicados ao Controle do Passe de Raiz
Resumo A medição da geometria da junta é tarefa fundamental para a automação da soldagem. Dentre os sensores utilizados para tal finalidade, os Sensores de Triangulação Laser para soldagem (STL) estão entre as tecnologias que melhor caracterizam a geometria da junta durante a soldagem. A medição da abertura de raiz (gap) é especialmente importante
Soldag. insp.. Publicado em: 2017-03
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9. EVALUATION OF LIMESTONE IMPURITIES IN THE DESULFURIZATION PROCESS OF COAL COMBUSTION GAS
Abstract Limestones have been used to capture SO2 emitted during the combustion of coal for decades. However, due to the complexities of the variables involved in this process, many issues are still being studied. Some tests were performed in a fluidized bed reactor, which was used to evaluate the performance of the limestones in the bed for flue gas desulfu
Braz. J. Chem. Eng.. Publicado em: 2017-01
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10. Growth and Characterization of Graphene on Polycrystalline SiC Substrate Using Heating by CO2 Laser Beam
The thermal decomposition of silicon carbide (SiC), with the subsequent formation of graphene, can be achieved by heating treatment. Several heating processes have been applied for this purpose by using SiC, either in form of powder particles or monocrystalline substrate. In this work, instead of using an expensive commercially available SiC wafer, a polycry
Mat. Res.. Publicado em: 26/09/2016
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11. Experimental Development of Dual Phase Steel Laser-arc Hybrid Welding and its Comparison to Laser and Gas Metal Arc Welding
Abstract Dual phase DP600 steels have been used in many automobile structures and laser welding has been the standard method for the joining of different sections. This work proposed a comparison between laser welding with arc welding (GMAW) and with hybrid laser-arc welding in order to access the microstructures and the mechanical behavior. The laser and hy
Soldag. insp.. Publicado em: 2016-09
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12. ON THE SYNTHESIS OF MOLYBDENUM CARBIDE WITH COBALT ADDITION VIA GAS-SOLID REACTIONS IN A CH4/H2 ATMOSPHERE
Abstract Due to ever more severe environmental regulations regarding SOx, NOx and other pollutants' emissions, there has been an interest in developing new and improved catalysts for hydroprocessing reactions. Mo2C has been reported to display good selectivity and activity for those reactions, especially for HDS. Addition of another metal to the carbide stru
Braz. J. Chem. Eng.. Publicado em: 2016-09