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98 results on '"Daurelio G."'

9. Fiber Laser Remelting and Surface Hardening of a Nickel-based Superalloy

Author

Daurelio, G., Angelastro, A., Campanelli, S. L., De Filippis, L. A. C., Pugliese, A. S., and Ludovico, A. D.

Subjects
Material Processing, Ni based SuperAlloys, Laser Surface Treatment, Laser Surface Re-Melting, Laser Heat Treating, Laser Surface Hardening, HPDL, Active Fiber Laser Diode, Selective Laser Surface Hardening, Laser Transformation Hardening, Laser Surface Absorption
Published
2016

26. Saldare l'inox col laser

Author

Daurelio G., Dionoro G., MEMOLA CAPECE MINUTOLO, FABRIZIO, Daurelio, G., Dionoro, G., and MEMOLA CAPECE MINUTOLO, Fabrizio

Published
1993

28. CO2 Laser Welding of Aluminium Shipbuilding Industry Alloys: AA 5083, AA 5383, AA 5059, and AA 6082

Author

Ancona A., Daurelio G., De Filippis L.A.C., Ludovico A.D., and Spera A.M.

Subjects
Carbon dioxide lasers, Thermodynamic properties, Laser beam welding, Shipbuilding, Laser cavities, Imaging systems, Melting, Aluminum alloys, Lenses, Impinging
Abstract

Aluminium alloys are interesting in many and many industrial applications, from the classical aircraft industry to rail and road vehicles manufacturing (High Speed Train, Car Structure and Body). Recently much more attention for Aluminium Alloys, 5000 and 6000 Series, has been carried out by Shipbuilding Industry, especially for using in the H.S.L.C. (High Speed Light Craft). Therefore the aim of this experimental work has been to study, develop and test a reproducible CO2 laser welding procedure and technique on four specific alloys, that is AA 5083, AA 5383, AA 5059 (Al-Mg Alloys), and AA 6082 (Al-Mg-Si Alloy). Different techniques, methodologies, covering gases, nozzles, focusing lenses and mirrors, welding speed range, laser power range (1000 and 2500 W) have been carefully experimented. The melted zones properties have been evaluated by cross sections, and some visual inspections by a NIKON LUCIA Imaging System correlating each experimental test, results and evaluations to the adopted process parameters and to the thermo-physical properties of the tested alloys.

Published
2003

31. Laser welding of INCONEL 600

Author

Daurelio G., Dionoro G., MEMOLA CAPECE MINUTOLO, FABRIZIO, Orza Jose M.,Domingo C., Daurelio, G., Dionoro, G., and MEMOLA CAPECE MINUTOLO, Fabrizio

Subjects
Laser, Carbon Dioxide, Nickel and Alloys
Abstract

In this work, a nickel base alloy INCONEL 600 has been welded by means of a 2 kW CO 2 cw laser. In order to evaluate the influence of the basic welding parameters on heat affected zone, weld structure and weld geometry, an accurate analysis has been carried out. The experimental results show a strict correlation between the power beam and the welding speed vs. the weld bead geometry. As the speed increases, so penetration decays. Microhardness tests, micro and macrograph examinations did not reveal, in the range of experimental parameters, any significant alteration in weld bead structure nor the presence of a HAZ. In order to assess process efficiency, the experimental data were processed using the Line Source Model (LSM) which permits to calculate the Melting Ratio (MR) and Energy Transfer Efficiency (ETE).

Published
1991

50. A New Solution for the Painting Artwork Rear Cleaning and Restoration: The Laser Cleaning.

Author

Nimmrichter, Johann, Kautek, Wolfgang, Schreiner, Manfred, Andriani, S. E., Catalano, I. M., Brunetto, A., Daurelio, G., and Vona, F.

Abstract

Before restoring a painting, in order to assure a good level of adhesion between the canvas and the preparation layer or to reline the painting, it is often necessary to consolidate the canvas by intervening on the painting rear. Traditional cleaning techniques, chemical combined with mechanical ones, show an important drawback: The cleaning process and technique enfeeble permanently the canvas. The present work performs a comparative study for evaluating both the cleaning process efficiency and the canvas integrity preservation by using various cleaning methods, including Nd:YAG laser systems and traditional techniques. The effects of a short free running mode (λ = 1,064 nm, pulse duration of 40-110 μs), a long Q-switched mode (λ = 1, 064 nm, pulse duration of 200 ns) and a Q-switched mode (λ = 1,064 and 532 nm, pulse duration of 6 ns) of Nd:YAG laser irradiation on the hemp canvas of a seventeenth century painting are investigated. The analyses using FTIR spectroscopy and degradation mapping by optical microscope, with photographs taken before, during and after the cleaning process, were carried out. The work is still in progress. [ABSTRACT FROM AUTHOR]

Published
2008
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