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Wednesday, July 29, 2020 | History

3 edition of Pulsed Nd-YAG laser welding of prototype fast breeder reactor fuel elements found in the catalog.

Pulsed Nd-YAG laser welding of prototype fast breeder reactor fuel elements

Pulsed Nd-YAG laser welding of prototype fast breeder reactor fuel elements

[BARC report]

  • 308 Want to read
  • 35 Currently reading

Published by Bhabha Atomic Research Centre in Mumbai .
Written in English

    Subjects:
  • Nuclear fuel elements

  • Edition Notes

    Statementby P.V. Suresh ... [et al.].
    SeriesBARC external -- BARC/2009/E/002
    ContributionsSuresh Varma, P. V., Bhabha Atomic Research Centre.
    Classifications
    LC ClassificationsMicrofiche# (T)
    The Physical Object
    FormatMicroform
    Pagination20 p.
    Number of Pages20
    ID Numbers
    Open LibraryOL24034096M
    LC Control Number2009305514

    Pulsed lamp-pumped Nd:YAG welding lasers are still the preferred choice in most medical, photonic and electronic applications. In seam welding, they have occasional competition from CW Nd:YAG and emerging fiber and disk laser technology, although the applications seldom overlap for reasons of materials, cost and speed. JK Nd:YAG lasers power range from W to W average power for pulsed operation & W to W for CW operation Lasers in the pulsed range capable of pulse durations from 15µs to >20ms, peak powers up to 18kW and pulse energies up to J (ideal for the complete range of laser .

    YAG Laser Welder LW-Y8 / LW-Y20 / LW-Y50 / LW-Y / LW-Y It is Widely Used in Precision Metal Welding! This is a standard YAG laser welder which is most suitable for precision welding of .   Shows the application of a vision system to follow a seam and produce a seam weld using overlapping laser pulses from a pulsed Nd:YAG laser lead frame cutting with pulsed .

    Nd:YAG (neodymium-doped yttrium aluminum garnet; Nd:Y 3 Al 5 O 12) is a crystal that is used as a lasing medium for solid-state dopant, triply ionized neodymium, Nd(III), typically replaces a small fraction (1%) of the yttrium ions in the host crystal structure of the yttrium aluminum garnet (YAG), since the two ions are of similar size. It is the neodymium ion which provides the.   Figure 1 The pulsed Nd:YAG laser is suitable for spot welding applications with less than in. penetration and seam welding of heat-sensitive packages. Four types of lasers can be used for microwelding: pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG), continuous wave (CW) fiber, quasi-continuous wave (QCW) fiber, and nanosecond fiber.


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Pulsed Nd-YAG laser welding of prototype fast breeder reactor fuel elements Download PDF EPUB FB2

Pulsed Nd:YAG laser welding of martensitic precipitation hardening (PH) stainless steel (SS) is investigated. In order to achieve optimum laser welding parameters, bead on plate (BOP) welding was conducted on PH SS. No crack was detected in the weldments, and microstructure of weld metal was δ-ferrite in the martensite by: 1.

The average peak power density in laser welding is much higher than arc welding, but it is lower than electron beam welding. Weldability of dissimilar metals is affected by their atomic radius, crystalline structure, and chemical solubility in liquid and solid : Hassan Akhiri Ardakani, Homam Naffakh-Moosavy.

Fundamentals of pulsed Nd:YAG and fiber laser welding Laser fundamentals Elements of a laser welding system The route to a successful weld. 2 Laser Fundamentals. 3 • How fast do the stages need to move • Does the laser or the part move.

63 Putting It All Together. 64File Size: 1MB. The fabrication of fuel elements for Prototype Fast Breeder Reactor (PFBR), involves welding of fully austenitic stainless steel thin-walled clad tube and stainless steel M end plug.

Pulsed TIG technique is generally used, for welding of clad tube and end plug. Laser welding. repeated laser pulses, as shown in Figure 2. Nd: YAG laser apparatus (Model IQL) with normal power of W produced standard square-shape pulses of 1– Hz frequency, ms duration and J energy.

The focal length of the focusing optical system was 75 mm which created spots of ~ µm size. A movable XYZ tableCited by: 1.

Optics and Lasers in Engineering 45 () – Pulsed Nd:YAG laser welding of AISI to AISI stainless steels Jose´ Roberto Berrettaa, Wagner de Rossib, Maurı´cio David Martins das Nevesc, Ivan Alves de Almeidab, Nilson Dias Vieira Juniorb aCentro Tecnolo ´gico da Marinha, Av.

Prof. Lineu Prestes,Cidade Universitaria,Sa˜o Paulo, Brazil. is emanated by the laser. Nd:YAG lasers may be operated in both pulsed and continuous mode providing power outputs between W. Solid-state lasers operate at very low wavelengths and hence cannot be operated with the naked eye Nd-YAG laser The Nd: YAG laser is an optically pumped solid state laser system that is capable of.

The pulsed Nd:YAG laser welding process is very unique in that it is the lowest heat input fusion welding process available to the industry and thus yields no/minimal distortion of the workpiece.

The laser beam is focused down to a very small diameter onto the workpiece and melts the materials to be joined at the joint interface. Lumenis’ long pulsed Nd:YAG laser is available as part of the M22™ multi-application platform. By utilizing the same power supply for both the IPL and the Nd:YAG laser, Lumenis is able to provide more treatment versatility in a single le Sequential Pulsing (MSP™) is available in both the Nd:YAG and the IPL modules on the M22™ platform.

Laser type. Flashlamp-pumped pulsed Nd:YAG laser. Laser wavelength. Laser power. 50 to W depending on model. Laser beam diameter.

mm depending on model. Max. laser energy. J depending on model. Pulse width. ms, adjustable. Pulse repetition rate. Hz, adjustable. Focused beam diameter.

This article describes how pulse shape, peak power and pulse-width affect the welding quality. And, make a conclusion that pulsed laser shapes, no matter with ramped-down waveform or ramped-up waveform, can be used to minimize the degradation of PET causes the decrease of gas bubbles that influence the bond strength and by: 1.

The Nd:YAG laser pulses at a high repetition rate and creates a conti nuous seam weld of overlapping spots. Unlike CO. 2 gas lasers, the pulsed Nd:YAG solid­ state laser produces very high peak pow­ ers relative to the average power of the laser. A typical pulsed Nd:YAG laser File Size: 2MB.

Nd: YAG laser is a four-level laser system, which means that the four energy levels are involved in laser action. These lasers operate in both pulsed and continuous mode. Nd: YAG laser generates laser light commonly in the near-infrared region of the spectrum at nanometers (nm).

An ultra compact pulsed Nd:YAG laser with laser beam peak power of kW and ms pulse duration is employed to produce a butt joint and lap joint for both spot and seam welding on a stainless.

The dissimilar weld, a fuel clad tube (D9 alloy) and an end plug made of AISI M forms a part of the fuel pin in the MW Indian Prototype Fast Breeder Reactor (PFBR). Every laser welding system has the same five elements: Laser, delivery of the laser to the workstation, laser focusing, motion and tooling.

For all lasers (except the CO 2 laser) the laser can be delivered to the workstation by a flexible cable, which enables very convenient connection of the laser directly to the focus head. If the gap or space between two parts to be laser welded is too big, the laser beam will pass down the center and possibly not melt either side.

Below is a video that shows a pulsed Nd:YAG laser weld with a focused spot size of about inch being used to weld two pieces of inch thick stainless.

The welding starts out successful. Pulsed Nd-YAG laser welding is associated with many variables such as peak power, pulse duration, pulse energy, defocusing distance, spot overlapping, frequency and pulse shape.

Shaping of laser pulse to get the desired weld bead geometry is getting importance. Shaping of laser pulse includes ramping up, ramping down, initial peak etc. The pulsed Nd:YAG laser has been around for many decades and has by far the largest install base. In today's laser landscape, it is best suited to spot welding application under in.

penetration and seam welding heat-sensitive packages. FIGURE 1 includes a few examples of Nd:YAG laser welding. Convergent Photonics CL Series Nd:YAG Pulse Lasers are specifically designed for laser drilling with features perfectly suited for drilling of cooling holes of turbine vanes, blades, shrouds, and combustor liners.

CL Series lasers are also utilized in exotic aerospace material cutting. The unique Internal Compensating Telescope (ICT) and Variable Spot Module (VSM) give this laser the ability. operate, maintain and service your Quanta-Ray Lab-Series pulsed Nd:YAG laser on a day-to-day basis.

Also described is the installation and operation of the HG harmonic generator and IHS internal harmonic separator. The system comprises three main elements: the Lab-Series laser head, the power supply and a table-top Size: 5MB.Application of pulsed Nd:YAG laser in thin foil microwelding Wagner de Rossi is a PhD in Nuclear Technology and currently is the responsible for the developments of industrial uses of lasers at the Center of Lasers and Applications of the Institute of Energy and Nuclear Research in São Paulo, Brazil.and pulse shaping.

As laser pulse welding is pushed to its limits in new and unique applications, it will be increasingly important to have good understating of the laser pulse and its effect on the parts being welded.

This paper presents insights into the anatomy of a laser pulse and its effect on weld size, shape, residual stress, and defects.