80 research outputs found
Laser Cutting of Stainless Steel Thin Sheets with Pulsed Nd:Yag Laser
The parameters of laser cutting mainly depend on material and from thickness. In
case of a given material and thickness many settings can be chosen. In this article we examine
the laser cutting of 0,4 mm thickness stainless steel sheets with pulsed Nd:YAG laser. We
examine the effect of cutting speed on cut quality in case of three different combinations of
pulse energy and pulse frequency.
Good cut quality and relatively high cutting speed can be achieved with 800 Hz and 20.7 mJ
setting, we can cut higher speed, but poor cut quality with 400 Hz and 49 mJ setting
Laser beam cutting and welding of coronary stents
Coronary stents are thin-walled and mesh-structured
metallic implants, which are made generally by laser beam
cutting of high-precision tubes of 90-120 micrometer
thickness. The tube material can be 316L stainless steel or
L605 type cobalt-chromium alloy. The paper present how
laser settings influence geometry and surface quality of the
kerf and residual stresses, which play very important role in
the precision of stent strut homogeneity.
Hungarian Tentaur stent was developed 15 years ago. This
coil stent made of 145 micrometers thick stainless steel wire
contains 9-25 joints produced by electric resistance
projection welding. Developments were bringing out for
increasing flexibility of Tentaur stent, and a new design and
a new tech-nology was elaborated, whichâs based on laser
beam mi-crowelding. TentaFlex stent also is constructed
from austenitic stainless steel wire, but it does not contain
any wire-crossing joint, because stent struts are configured
from sinusoidal helix. Stent contains only two welded joints
at its ends. Laser welding experiences of these joints are
presented in the paper. A Trumpf PowerWeld Nd:YAG laser
work station was used for welding, and after optimization of
laser settings joints canât produces from only one side of the
coiled stent
SOME APPLICATIONS OF INFRARED AND ULTRAVIOLET SPECTROSCOPY FOR THE TOXICOLOGICAL EXAMINATION OF MEDICAL PLASTIC PRODUCTS
A fĂłkuszhelyzet szerepe erĆsen reflektĂĄlĂł anyag egyimpulzusos, lĂ©zersugaras fĂșrĂĄsakor
A megmunkĂĄlĂł lĂ©zer hullĂĄmhosszĂĄn erĆsen reflektĂĄlĂł anyagok megmunkĂĄlĂĄsakor tekintetbe kell venni, hogy az energia csak kis rĂ©sze hasznosul, a többi visszaverĆdik. Jelen esetben az 1070 nm-es hullĂĄmhosïżœ- szon a rĂ©z Ă©s az ezĂŒst szĂĄmĂt ilyen anyagnak. A nyomtatott ĂĄramköri lemezek fĂșrĂĄsakor a rĂ©zrĂ©teget is ĂĄt kell fĂșrni. Sokszor elĆnyös, hogy az erĆsen reflektĂĄlĂł anyagba kisebb furatokat lehet kĂ©szĂteni Ă©ppen a rossz energiahasznosĂtĂĄs miatt. TermĂ©szetesen az egyimpulzusos, lĂ©zersugaras fĂșrĂĄskor a fĂłkuszpozĂciĂłnak is nagy szerepe van: a fĂłkuszĂĄlt lĂ©zernyalĂĄb fĂłkuszĂĄban lehet a legkisebb, tĆle tĂĄvolodva nagyobb ĂĄtmĂ©rĆjƱ furatokat kĂ©szĂteni
Role of the Features of Focused Laser Beam at Pulsed Laser Cutting
In this article investigation of the roles of two important factors of focused laser beam, the focal spot diameter and the Rayleigh length as determining variables of the beam quality were made. The equations of these two factors are based on those most commonly used in the literature. The exchange between three different beam quality numbers were shown. It is proven on the basis of the scientific literature, that the beam quality degrades compared to the original data given by the factory of laser. The causes of the beam quality degradation are lens aberrations in the optical path of the given laser, and the shifting of the beam propagation ratio (M2) to higher values. A new equation for estimation of the new, lowest value for M2 factor is presented, based on the comparison of the laser cut material thickness to the depth of focus, which is two times the Rayleigh length
Taiarea si sudarea cu fascicul laser a stenturilor coronariene | Laser beam cutting and welding of coronary stents
Occurrence of Deoxynivalenol in winter wheat grains harvested in Hungary over the years 2012-2017 : [abstract]
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