TITLE

Analysis of induced effects in matter during pulsed Nd:YAG laser welding by flash radiography

AUTHOR(S)
Pascal, G.; Nore´, D.; Girard, K.; Perret, O.; Naudy, P.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1349
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Tantalum and TA6V (titanium alloy) are respectively used in corrosive chemical product containers and in aircraft and aerospace industries. The objective of this study was to analyze the dynamic behavior of the matter during deep laser spot welding of these materials. The obtained images should allow a better understanding of laser-matter interaction and should validate a model developed for porosities formation. Because of the afterglow of detectors, classical video x-ray systems are not suitable for the analysis of short dynamic effects during and after the laser pulse. An experimental device, based on a flash x-ray generator EUROPULSE 600 kV and a QUANTEL pulsed Nd:YAG laser, has been used. The flash x-ray generator is triggered, after a programmed delay, by the laser shot. The x-ray pulse duration is 30 ns. Welding parameters (pulse duration and energy) yield molten zones of 2 mm depth. Both materials, tantalum and TA6V, have been tested. Radiological films BIOMAX coupled with radioluminescent screens and direct exposure film (DEF) were respectively used for tantalum and TA6V samples. A fine collimation was studied to avoid the scattering effect in the material and in the radioluminescent screen. Radiological test samples, made of tantalum and TA6V, were performed to estimate the images qualities obtained by flash radiography. About 270 laser/x-rays shots were performed. The radiographic images have been digitalized and processed. The results show a deep and narrow capillary hole called “keyhole” which appears a few milliseconds after the beginning of the interaction. The “keyhole” hollows until the end of the laser pulse. After the end of the laser pulse, the molten bath collapses in less than 1 ms, trapping cavities. © 2000 American Institute of Physics.
ACCESSION #
6029251

 

Related Articles

  • Predicted alternative structure for tantalum metal under high pressure and high temperature. Liu, Zhong-Li; Cai, Ling-Cang; Zhang, Xiu-Lu; Xi, Feng // Journal of Applied Physics;Aug2013, Vol. 114 Issue 7, p073520 

    First-principles simulations have been performed to investigate the phase stability of tantalum (Ta) metal under high pressure and high temperature. We searched its low-energy structures globally using our developed multi-algorithm collaborative crystal structure prediction technique. The...

  • Modeling of the dynamic inelasticity of tantalum single crystal under ramp wave loading. Ding, J. L.; Asay, J. R. // Journal of Applied Physics;Apr2011, Vol. 109 Issue 8, p083505 

    In a previous study, the behavior of single crystal tantalum under ramp wave loading along the [100] and [110] orientations was characterized. The principal objective of the present study is to gain some insights on the observed single crystal behavior particularly on its precursor response and...

  • A physical model of switching dynamics in tantalum oxide memristive devices. Mickel, Patrick R.; Lohn, Andrew J.; Joon Choi, Byung; Joshua Yang, J.; Zhang, Min-Xian; Marinella, Matthew J.; James, Conrad D.; Stanley Williams, R. // Applied Physics Letters;6/3/2013, Vol. 102 Issue 22, p223502 

    We present resistive switching model for TaOx memristors, which demonstrates that the radius of a tantalum rich conducting filament is the state variable controlling resistance. The model tracks the flux of individual oxygen ions and permits the derivation and solving of dynamical and static...

  • Thermal oxidation of tantalum films at various oxidation states from 300 to 700 °C. Chandrasekharan, Ramesh; Park, Inkyu; Masel, R. I.; Shannon, Mark A. // Journal of Applied Physics;12/1/2005, Vol. 98 Issue 11, p114908 

    This paper presents the combined use of mathematical modeling and Auger depth profiling to study and quantify the oxidation of Ta films over a wide range of temperatures. The thermal oxidation of tantalum films (∼700 nm) is studied using direct measurements of species concentration by means...

  • Decay of a three-quasiparticle isomer in the neutron-rich nucleus 183Ta. Palalani, N.; Lane, G.J.; Dracoulis, G.D.; Kondev, F.G.; Byrne, A.P.; Carpenter, M.P.; Chiara, C.J.; Chowdhury, P.; Hughes, R.O.; Janssens, R.V.F.; Lauritsen, T.; Lister, C.J.; McCutchan, E.A.; Seweryniak, D.; Stefanescu, I.; Watanabe, H.; Zhu, S. // EPJ Web of Conferences;2012, Issue 35, preceding p06004-p.2 

    Excited states in neutron-rich tantalum isotopes have been studied with deep-inelastic reactions using 136Xe ions incident on a 186W target. New transitions observed below the τ=1.3 µs isomer in 183Ta have enabled the establishment of its energy and put limits on the spin and parity. On...

  • Structural and mechanical properties of TaZrN films: Experimental and ab initio studies. Aouadi, S. M. // Journal of Applied Physics;3/1/2006, Vol. 99 Issue 5, p053507 

    This paper reports on the growth and characterization of the structural and mechanical properties of tantalum zirconium nitride films and the subsequent simulation of these properties using an ab initio calculation based on density functional theory (DFT) within the generalized gradient...

  • Dielectric and magnetic properties in Ta-substituted BiFeO3 ceramics. Youn-Ki Jun; Sung Bo Lee; Miyoung Kim; Seong-Hyeon Hong; Jae Wook Kim; Kee Hoon Kim // Journal of Materials Research;Dec2007, Vol. 22 Issue 12, p7 

    The dielectric and magnetic properties were investigated in Ta-substituted BiFeO3 polycrystalline ceramics synthesized by a solid-state reaction. The Ta substitution decreased the grain size by two orders of magnitude compared with that of unsubstituted ceramics and increased the electrical...

  • HUGONIOT MEASUREMENT OF GOLD IN PRESSURE RANGE TO 580 GPa. Yokoo, Manabu; Kawai, Nobuaki; Nakamura, Kazutaka G.; Kondo, Ken-ichi // AIP Conference Proceedings;12/12/2007, Vol. 955 Issue 1, p113 

    Hugoniot for gold and tantalum have been measured in pressure range from 240 to 580 GPa with a two-stage light gas gun. The accuracies for impactor velocities were about 0.2 % and those for shock velocities range from 1.0 to 2.3 %. Symmetric impact experiments of Ta were performed to measure...

  • Tantalum, alloys and compounds.  // Design News;12/26/94, Vol. 50 Issue 25, p639 

    Lists companies in the United States that manufacture tantalum alloys and compounds. Includes Alfa Johnson Matthey; Astro Metallurgical; Atomergic Chemetals Corp.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics