Metallurgical Work
Mostrando 1-12 de 69 artigos, teses e dissertações.
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1. Contributions of the High Frequency Dynamic Wire Feeding in the GTAW Process for Increased Robustness
Abstract: The GTAW process is recognized as a process of high metallurgical quality, being widely used in the pipelines welding, mainly in the root pass. The relative independence between the heat delivered to the melting pool and the amount of material added helps to control the melting of the material and to avoid the appearance of welding discontinuities
Soldag. insp.. Publicado em: 02/12/2019
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2. Quality of Wood and Charcoal from Eucalyptus Clones for Metallurgical Use
ABSTRACT The objectives of the present work were to determine the properties of wood and charcoal from Eucalyptus clones and assess impacts of charcoal features on the CO2 gasification reactivity and to compare with coke reactivity. Gasification reactivity was performed using charcoal particles in a furnace setup at 820 °C, under CO2 atmosphere. The results
Floresta Ambient.. Publicado em: 03/10/2019
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3. Study of the metallurgical bond between 316 steel substrates and NiCrAlY coating sprayed by HVOF and irradiated with a low power CO2 laser
RESUMO Considerando a importância do desenvolvimento de novos materiais ao longo dos últimos anos; os pesquisadores vêm estudando soluções eficazes através do uso de revestimentos de alta dureza para aplicação em ferramentas de corte e matrizes de conformação. Revestimentos de carboneto de tungstênio (WC) são um dos mais utilizados em sistemas de
Matéria (Rio J.). Publicado em: 16/09/2019
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4. Brazilian refractory grade bauxite: a new alternative to refractories makers and users
Abstract After two centuries of the discovery, we now know that there are several types of bauxites, in which mineralogy points to the most appropriate application. In the non-metallurgical industry, bauxites with refractory grades have been applied as raw materials in the production of high-alumina refractories for both shaped and unshaped. The increase in
Cerâmica. Publicado em: 2019-01
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5. 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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6. Análisis comparativo en la determinación de ferrita delta para aceros inoxidables austeníticos
ABSTRACT In the welding of austenitic stainless steels, the determination of delta ferrite (δ-ferrite) is very important to assess the susceptibility of weld metal to hot cracking, one of the major problems related to weldability, metallurgical and mechanical behavior of this type of steels. The determining δ-ferrite in the weld metal can be performed with
Matéria (Rio J.). Publicado em: 19/07/2018
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7. Comportamiento frente a la corrosión de uniones soldadas por fricción agitación de AA7075-T651: Evaluación galvánica
ABSTRACT Friction Stir Welding (FSW) is a novel solid-phase welding process, which has proved to have a great potential for the realization of welded joints in materials with poor weldability such as heat-treatable aluminum alloys. The aerospace industry has incorporated this process for the manufacture of structural elements, using known high strength alloy
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Manufacturing of Cu-Sn foams through SDP
ABSTRACT This work reports the processing of bronze foams manufactured by using the powder metallurgy method known as Sintering Dissolution Process. During the sintering step, a device with controlled atmosphere separated from the heating furnace was employed to avoid the quick oxidation of metal particles. The device allows to control its internal atmospher
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Design of the austempering heat treatment of a ductile iron differential case aided by computer simulation
Abstract Austempered ductile iron is frequently employed in the fabrication of automobile parts due to its good mechanical properties, and its simplicity and low cost of the manufacturing process. The heat treatment design is an important stage, in which parameters such as temperatures and durations are chosen according to the required microstructure, part
Lat. Am. j. solids struct.. Publicado em: 02/07/2018
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10. SEM study of a lead-iron slag flotation process
Abstract Companies producing lead-acid batteries are required by law to recycle their battery scrap. The recycling can be performed by a pyrometallurgical process resulting in slags containing mainly lead and iron. A study was carried out with the aim of recovering the lead contained in this slag. This work has economic and environmental implications. Slag c
REM, Int. Eng. J.. Publicado em: 2018-07
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11. Investigation of Mechanical and Metallurgical Properties of Friction Stir Corner Welded Dissimilar Thickness AA5086-AA6061 Aluminium Alloys
In this investigation, an attempt has been made to fabricate dissimilar thickness corner joint using non-heat treatable (AA5086) and heat treatable (AA6061) dissimilar aluminium alloys by friction stir welding process with plate thicknesses of 6mm and 4mm. Three parameters and three levels were considered to conduct the experiments such as welding and rotati
Mat. Res.. Publicado em: 11/06/2018
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12. Applying chemometrics to predict metallurgical niobium recovery in weathered ore
Abstract Niobium metallurgical recovery measures how much of the metal content in the ore is separated in the concentrate after the mineral processing stages. This information can be obtained through laboratory tests with ore samples obtained during drilling. Thereunto, representative ore samples are subjected to tests mimicking the ore concentration process
REM, Int. Eng. J.. Publicado em: 2018-03