Heat Flow and Fluid Aspects of C02 Laser Welding

Crafer, R. C.

doi:10.1007/978-94-009-3569-3_8

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…Annular rings are noted for having some success achieving more uniform heating effects both in stationary [164] and moving beam applications [165]. There are several methods of carrying out the transformation, all of which are based either on the principles of reflection, refraction, diffraction or a combination of these.…”

Section: Beam Shaping Technologies and Their Applicationsmentioning

confidence: 99%

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Shang¹,

Fearon²,

Wellburn³

et al. 2011

J. Phys. D: Appl. Phys.

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Declaration I hereby declare that this submission is my own work and that, to the best of my knowledge and belief, it contains no material previously published or written by another person nor material which to a substantial extent has been accepted for the award of any other degree or diploma of the University or other institute of higher learning, except where due acknowledgment has been made in the text: Signature Name: Shuo Shang Date: Friday 17 th August 2012 .

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Section: Beam Shaping Technologies and Their Applicationsmentioning

confidence: 99%

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Shang¹,

Fearon²,

Wellburn³

et al. 2011

J. Phys. D: Appl. Phys.

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Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity

Yeates

Kennedy

2011

Journal of Applied Physics

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The dynamics of laser generated plasma plumes expanding within confining surfaces display a two-phase nature. Early phase enhancement due to hydrodynamic containment results in higher temperatures, densities, and average charges states in comparison to freely expanding plasma plumes. Later phase dynamics result in rapid decay of the plasma plume due to lossy plasma—surface interactions. This paper examines laser plasma generation and expansion within rectangular aluminium cavities biased to high voltages (Vbias = ±9 kV). “Hydro-electro-dynamic” confinement of the laser plasma plumes and the expansion dynamics were studied via space and time resolved visible emission spectroscopy. The charged confining cavities displayed enhanced emission, higher electron densities (Ne) and longer emission durations compared to those of an unbiased cavity. This behavior is attributed to the influence of the electric fields in the cavity on the charged particle dynamics within the cavity volume. The degree of enhancement depended strongly on the applied polarity.

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Heat Flow and Fluid Aspects of C02 Laser Welding

Cited by 2 publications

References 1 publication

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity

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