Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Corrosion or damage prevention
Patent
1996-01-30
1998-08-04
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Corrosion or damage prevention
376310, 376326, 148525, 134 1, G21C 1900, G21C 13087, B23K 2612
Patent
active
057906203
ABSTRACT:
An underwater laser processing method is carried out by irradiating, through a laser beam irradiation apparatus, a laser beam having a high output, a short pulse and a visible wavelength to a surface of a structure immersed in a water to improve residual stress of a material of the surface of the structure and remove a crack or a CRUD thereof. The laser beam irradiation apparatus comprises a pulse laser device suspended into a water in which a metal material is accommodated from an upper side thereof for irradiating a laser beam having a visible wavelength to a processing position, a beam strength adjusting device for adjusting an output per 1 pulse of a laser beam generated by the pulse laser device and a mechanism for adjusting a spot diameter and a multiplexing ratio of an irradiated beam.
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patent: 4401477 (1983-08-01), Clauer et al.
patent: 5333161 (1994-07-01), Thompson et al.
Journal De Physique IV, vol. 1, pp. C3-487-C3-494, Oct. 1991, P. Ballard, et al., "Residual Stresses Induced by Laser-Shocks".
Aoki Nobutada
Ito Arata
Kikunaga Muneyoshi
Konagai Chikara
Mukai Naruhiko
Kabushiki Kaisha Toshiba
Wasil Daniel D.
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