National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Study of the influence of process parameters on welding properties of ferritic stainless steel in laser oscillation welding
Křepela, Petr ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The aim of this work was to carry out an experiment to assess the influence of the individual welding parameters in the laser welding method with the beam wobbling on the made weld, respectively. welds. The material which was welded was ferritic stainless steel with the designation 1.4016, which, like all ferritic steels, is susceptible to coarse grains and the resulting brittleness which leads to degradation of the mechanical properties of the weld. The welds were compared to a sample welded without wobbling an between themselves. Unfortunately, however, the evaluation of the test samples did not bring significant differences from laser welding without wobbling, however some changes are evident, such as grain orientation, weld defects, or uniformity of mechanical properties over the weld length, where wobbling frequency is most important. Further research should focus on limiting the porosity at higher wobbling frequencies in the shape of a circle or ellipse.
Thermal biomass treatment
Křepela, Petr ; Šnajdárek, Ladislav (referee) ; Baláš, Marek (advisor)
The aim of this work is to provide an overview of biomass processing methods, description of final products and their practical application. Furthermore, a description of the technologies used for each method and the comparison of the efficiency. To achieve these goals, it is necessary to carry out a literature search and to produce a comprehensive set of meaningful information that is comprehensible to every reader, but does not hurt the professional public.

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4 Křepela, Pavel
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