National Repository of Grey Literature 215 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
SMV-2022-53: Termacut_training
Mrňa, Libor
Training in laser cutting technology with an emphasis on the issue of laser cutting nozzles.
SMV-2022-52: PZK_wobble_weld
Mrňa, Libor
Verification of the use of laser wobble welding technology for welding the shell of magnetic couplings PK 196 392.
SMV-2022-51: ABBrob-expertise
Mrňa, Libor
Consulting and training in the field of laser performance technologies - assessment of the technology of a robotic workplace for laser cutting of plastic products in the company Atrea.
SMV-2022-50: KASI_Picofabrication
Mrňa, Libor
Verification of the possibility of manufacturing injection nozzles from K10 carbide by laser picosecond micromachining.
SMV-2022-49: PBS_DLT_Picofabrication
Mrňa, Libor
Verification of the production possibilities of specified parts from austenitic stainless steel 1.4541 by laser picosecond micromachining.
SMV-2022-46: Mauting _lasweld108
Mrňa, Libor
Development of laser welding technology of a given exchanger A1163897.00.
SMV-2022-47: Lascam_weld+cut
Mrňa, Libor
Tests of scanner laser welding of press nuts, tests of laser 3D division of the supplied profile, tests of welding Al battery bus with Li battery poles.
SMV-2022-48: BUT_FME_microstructure
Mrňa, Libor
Microstructuring of the surface of the supplied samples using picosecond micromachining.
Welding of Al-Si coated high-strength steel 22MnB5
Šebestová, Hana ; Horník, Petr ; Mikmeková, Šárka ; Novotný, Jan ; Mrňa, Libor
Al-Si-based coatings are widely used as surface protection of steel sheets against high-temperature oxidation during the hot stamping process. Laser welding is a suitable technology for hardened components joining because it does not produce a wide heat-affected zone with a degraded microstructure. The highly concentrated energy of the laser beam is responsible for rapid heating and subsequent rapid cooling of material which results in insufficient homogenization of the weld metal. In Al-rich areas (Al originates from the coating), ferritic bands are formed in the dominantly martensitic matrix. These bands decrease the strength of laser weld by more than one third compared to the base metal. The low-power electric arc placed immediately behind the laser beam can help to achieve a slower cooling of the weld metal, reduce the ferritic bands and increase the strength of weld joints up to 90 % of base metal tensile strength.
Aplication of picosecond laser micromachinning for manufacturing of reflective DOE for CW power lasers
Mrňa, Libor ; Novotný, Jan ; Kolařík, Vladimír
Reflective optical elements are advantageous in terms of ease of cooling, where even a less efficient element can be easily operated without damage by a simple cooling system. When material interacts with the ultrashort pulses, the interaction is largely non-thermal and the material can be removed in a very defined manner without affecting the surrounding area. Direct ablation with ultrashort laser pulses enables fast and flexible fabrication of diffractive optical elements (DOEs). Ultrashort pulses can also be used to machine difficult-to-machine materials with conventional lasers and easily create spatial structures on the order of tens of micrometers.

National Repository of Grey Literature : 215 records found   previous11 - 20nextend  jump to record:
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1 Mrňa, L.
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