Development of a Co-free, Ni-based alloy layer (Ni-SD) for sealing surfaces of nuclear-power valves cladding by hollow laser beam

In this study, the parameters for underwater laser cutting of 50-mm thick stainless steel, which is typically used in nuclear power structures, are investigated. The focal position of laser beam significantly affects the cutting quality. In particular, in the cutting of the thick sample, change in the focal position determines the kerf width and the roughness of the cut surface. Moreover, the effects of the variation of kerf width and the cut surface characteristics on the focal position of the laser beam are investigated. As the focal position moved to the inside of the material, the upper kerf width increased, but the quality of the cut surface was improved.

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Theory of atom guidance in a hollow laser beam: dressed-atom approach

Journal of the Optical Society of America B ◽

10.1364/josab.17.001039 ◽

2000 ◽

Vol 17 (6) ◽

pp. 1039 ◽

Cited By ~ 53

Author(s):

Xinye Xu ◽

Yuzhu Wang ◽

Wonho Jhe

Keyword(s):

Laser Beam ◽

Hollow Laser Beam

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Determination of Copper in A533b Steel for the Assessment of Radiation Embrittlement Using Laser-Induced Breakdown Spectroscopy

Applied Spectroscopy ◽

10.1366/0003702963906294 ◽

1996 ◽

Vol 50 (3) ◽

pp. 306-309 ◽

Cited By ~ 36

Author(s):

Wolfgang E. Ernst ◽

Dave F. Farson ◽

D. Jason Sames

Keyword(s):

Laser Beam ◽

Fiber Optics ◽

Nuclear Power ◽

Power Plants ◽

Pressure Vessels ◽

Laser Induced Breakdown Spectroscopy ◽

Radiation Embrittlement ◽

Breakdown Spectroscopy ◽

Laser Induced Breakdown

Determination of radiation embrittlement in nuclear reactor pressure vessels is crucial to assessing safe operative lifetimes for many aging nuclear power plants. Conservative nuclear fluence estimates and trace impurity diagnosis of the weldment material are the basis of radiation embrittlement analysis. Copper is thought to be a key impurity contributing to radiation embrittlement. In this paper, the application of laser-induced breakdown spectroscopy (LIBS) as a means to assess radiation embrittlement by the detection and quantification of copper in A553b steel was investigated. A LIBS configuration completely coupled by fiber optics was attempted, but because of low laser power and fiber losses, fiber-optic delivery of the laser beam was unsuccessful. Consequently, hard optics (lenses and mirrors) were employed for laser beam delivery. The plasma emission was delivered successfully via fiber optics to the detection apparatus. Copper measurements were made from custom-fabricated steel samples. Comparison of the LIBS results to an independent atomic absorption spectrophotometry (AAS) analysis showed LIBS to be of comparable accuracy, especially in low-level copper samples.

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Generation of hollow laser beam with adjustable profile distribution by using tapered fiber

Optics & Laser Technology ◽

10.1016/j.optlastec.2021.107384 ◽

2021 ◽

Vol 143 ◽

pp. 107384

Author(s):

Shuo Zhang ◽

Yong Bi ◽

Weinan Gao ◽

EnLong Zhang ◽

Xia Zhao ◽

...

Keyword(s):

Laser Beam ◽

Tapered Fiber ◽

Profile Distribution ◽

Hollow Laser Beam

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Tailored Transverse Mode Vertical-Cavity Surface-Emitting Laser: Hollow Laser Beam Emission through Circle Aperture

IEEE Photonics Journal ◽

10.1109/jphot.2020.3003927 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1-6

Author(s):

Yinli Zhou ◽

Xing Zhang ◽

Jianwei Zhang ◽

Youwen Huang ◽

Yugang Zeng ◽

...

Keyword(s):

Laser Beam ◽

Transverse Mode ◽

Cavity Surface ◽

Vertical Cavity Surface ◽

Surface Emitting Laser ◽

Hollow Laser Beam ◽

Vertical Cavity

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Process Parameters Control of Deposition of Hollow Cylindrical Part with Internal Wire Feeding through a Hollow Laser Beam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.419.305 ◽

2013 ◽

Vol 419 ◽

pp. 305-309 ◽

Cited By ~ 2

Author(s):

Ming Jun Wu ◽

Shi Hong Shi ◽

Ge Yan Fu ◽

Yu Liu

Keyword(s):

Laser Beam ◽

Process Parameters ◽

Cylindrical Part ◽

Uneven Surface ◽

Real Time Control ◽

Time Control ◽

Optimization Of Process Parameters ◽

Wire Feeding ◽

Formed Part ◽

Hollow Laser Beam

A new inside-laser coaxial wire feeding processing is adopted that can ensure a good axiality between wire and laser beam through transmitting wire along the centerline of the laser beam. Basing on the optimization of process parameters and single beads cladding experiments, the causes of the uneven surface of the formed part is analyzed. By putting forward a method of the real-time control of the defocusing amount and the laser power, a fine multi-layer hollow rotary part is formed. The formed part has no subsidence damage and crack on the whole cladding layer. The size of the error is small and the hardness of the laser cladding is uniformly distributed.

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