Author
Luísa Quintino
Other affiliations: Technical University of Lisbon, Universidade Nova de Lisboa, European Welding Federation ...read more
Bio: Luísa Quintino is an academic researcher from Instituto Superior Técnico. The author has contributed to research in topics: Welding & Laser beam welding. The author has an hindex of 26, co-authored 92 publications receiving 2306 citations. Previous affiliations of Luísa Quintino include Technical University of Lisbon & Universidade Nova de Lisboa.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a brief review of the development of high power fiber laser is presented, and initial data on welding of API 5L: X100 pipeline steel with an 8kW fiber laser.
300 citations
TL;DR: Friction surfacing (FS) is a solid state technology with increasing applications in the context of localized surface engineering and has been investigated mainly for producing fine grained coatings, which exhibit superior wear and corrosion properties.
198 citations
TL;DR: In this article, the results of a study of the application of two adhesives with different stiffnesses along the overlap length in single lap joints were presented, and the results showed measurable increase in strength of the bi-adhesive bonded joints compared with those in which single adhesive were used over the full length of the bondline.
169 citations
TL;DR: In this paper, the main objective of this paper is to review the main NDT techniques and assess the capability of detecting WAAM defects, for inspection either in a monitoring, in-process or post-process scenario.
Abstract: The present work addressed the challenges of identifying applicable Non-Destructive Testing (NDT) techniques suitable for inspection and materials characterization techniques for Wire and Arc Additive Manufacturing (WAAM) parts. With the view of transferring WAAM to the industry and qualifying the manufacturing process for applications such as structural components, the quality of the produced parts needs to be assured. Thus, the main objective of this paper is to review the main NDT techniques and assess the capability of detecting WAAM defects, for inspection either in a monitoring, in-process or post-process scenario. Radiography and ultrasonic testing were experimentally tested on reference specimens in order to compare the techniques capabilities. Metallographic, hardness and electrical conductivity analysis were also applied to the same specimens for material characterization. Experimental outcomes prove that typical WAAM defects can be detected by the referred techniques. The electrical conductivity measurement may complement or substitute some destructive methods used in AM processing.
130 citations
TL;DR: In this article, the feasibility of achieving high deposition rate using wire + arc additive manufacturing in stainless steel to reduce lead time and cost of manufacturing was investigated and a 9.5 kg/h deposition rate was achieved.
Abstract: This study investigates the feasibility of achieving high deposition rate using wire + arc additive manufacturing in stainless steel to reduce lead time and cost of manufacturing. The pulse MIG welding technique with a tandem torch was used for depositing martensitic stainless steel 17-4 pH. The mechanical and metallurgical properties of the manufactured component were analysed to evaluate the limitations and the extent to which the rate of deposition reaches a maximum without any failure or defect being evident in the manufactured component. Deposition rate of 9.5 kg/h was achieved. The hardness was matched for the as deposited condition.
115 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.
4,192 citations
TL;DR: In this paper, the authors cover the latest developments in enhanced mechanical properties of aluminium alloys, and high performance joining techniques, including laser beam welding and friction stir welding, and compare them with the traditional aluminum alloys.
1,726 citations
Book•
12 Mar 2014
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Abstract: In the laser treatment of a workpiece (9), e.g. for surface hardening, melting, alloying, cladding, welding or cutting, the adverse effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1). The two beams (1)(5) may be combined by a beam coupler (4) or may reach the workpiece (9) by separate optical paths (not shown). The shorter wavelength beam (1) improves the coupling efficiency of the higher- powered laser beam (5).
1,539 citations
TL;DR: A comprehensive review of surface composites via friction stir processing is presented in this article, where the underlying mechanisms in strengthening of FSP-processed surface composite are discussed with reported models.
408 citations