9 documents found, page 1 of 1
Development of a gas metal arc based prototype for direct energy deposition wit...
Dornelas, Paulo Henrique Grossi; Oliveira, J. P.; Silva, Tadeu Castro da; Ramos, Ana Sofia; Santos, Telmo G.In recent years, efforts have been focused on the development of metal additive manufacturing (AM) processes to address the growing trend of miniaturization in industries such as aerospace and electronics. Thus, new technologies have been developed based on a downscaled approach using direct energy deposition (DED) processes, now referred to as μ-DED. In this context, the development of a downscaled DED prototy...
Effect of heat treatments on 316 stainless steel parts fabricated by wire and a...
Rodrigues, Tiago A.; Escobar, J. D.; Shen, Jiajia; Duarte, Valdemar R.; Ribamar, G. G. [UNESP]; Avila, Julian A. [UNESP]; Maawad, Emad; Schell, NorbertMade available in DSpace on 2022-04-28T19:47:05Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-12-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); CALIPSOplus; Fundação para a Ciência e a Tecnologia; Different geometrical features and intricate parts can now be fabricated by wire and arc additive manufacturing (WAAM). Even though a broad range of applications rises with this technology...
In situ ultrasonic testing for wire arc additive manufacturing applications
Lopez, Ana Beatriz; Sousa, José Pedro; Pragana, J.P.M; Bragança, Ivo; Santos, Telmo G.; Silva, C.M.A.In this paper, we present a non-destructive testing (NDT) technique based on in situ detection of defects up to 100 °C by ultrasonic testing (UT) during construction of parts by a metal additive manufacturing technology known as wire arc additive manufacturing (WAAM). The proposed technique makes use of interlayer application of commercial solder flux to serve as coupling medium for in situ inspection using a s...
New material concepts
Nunes, J. P.; Costa, Artur José Teixeira; Rodrigues, Daniela Sofia Sousa; Covas, J. A.; Viana, J. C.; Pontes, A. J.; Duarte, F. M.This chapter focuses on new compositions of thermoplastic matrices and reinforcements to process by fused deposition modelling (FDM). The available materials for this additive manufacturing (AM) technique are generally limited to PLA—polylactic acid, ABS—acrylonitrile butadiene styrene and PA—polyamide NYLON®)with temperature gradients and mechanical behaviours that are not suited for high-performance applicati...
In-situ strengthening of a high strength low alloy steel during Wire and Arc Ad...
Rodrigues, Tiago A.; Duarte, V. R.; Tomás, D.; Avila, Julian A. [UNESP]; Escobar, J. D.; Rossinyol, Emma; Schell, N.; Santos, Telmo G.; Oliveira, J. P.Made available in DSpace on 2020-12-12T01:21:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-01; European Institute of Innovation and Technology; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); In this work, SiC particles were added to the molten pool during WAAM of a high strength low alloy steel. The introduction of these high melting point particles promoted grain refinement, and ...
Influence of processing parameters on the density of 316L stainless steel parts...
Pragana, J. P. M.; Pombinha, Pedro; Valdemar, R. Duarte; Rodrigues, Tiago A.; Oliveira, João P.; Bragança, Ivo; Santos, Telmo G.; Miranda, Rosa M.Additive manufacturing technologies are becoming more popular, as they allow the fabrication of specific parts with complex geometries not achievable by conventional manufacturing. In metal additive manufacturing, one of the most widely used technologies is laser powder bed fusion. This work focuses on the influence of different processing parameters on the density of AISI 316L stainless parts obtained through ...
Wire and arc additive manufacturing of HSLA steel: Effect of thermal cycles on ...
Rodrigues, Tiago A.; Duarte, V.; Avila, Julian A. [UNESP]; Santos, Telmo G.; Miranda, R. M.; Oliveira, J. P.Made available in DSpace on 2019-10-06T15:38:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-05-01; Ministério da Ciência, Tecnologia e Ensino Superior; Wire and arc additive manufacturing (WAAM) is a viable technique for the manufacture of large and complex dedicated parts used in structural applications. High-strength low-alloy (HSLA) steels are well-known for their applications in the tool and die ...
Comparison of deposited surface area of airborne ultrafine particles generated ...
Gomes, J. F.; Albuquerque, Paula Cristina; Miranda, Rosa M.; Santos, Telmo G.; Vieira, M. T.This article describes work performed on the assessment of the levels of airborne ultrafine particles emitted in two welding processes metal-active gas (MAG) of carbon steel and friction-stir welding (FSW) of aluminium in terms of deposited area in alveolar tract of the lung using a nanoparticle surface area monitor analyser. The obtained results showed the dependence from process parameters on emitted ultrafin...
Comparison of deposited surface area of airbone ultrafine particles generated f...
Gomes, João; Albuquerque, Paula Cristina; Miranda, Rosa M.; Santos, Telmo G.; Vieira, Maria Teresa FreireThis article describes work performed on the assessment of the levels of airborne ultrafine particles emitted in two welding processes metal-active gas (MAG) of carbon steel and friction-stir welding (FSW) of aluminium in terms of deposited area in alveolar tract of the lung using a nanoparticle surface area monitor analyser. The obtained results showed the dependence from process parameters on emitted ultrafin...