National Repository of Grey Literature 198 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
Influence of technological process of powder painting on the quality of silver-plated components in gas insulated substation - GIS
Nováková, Eliška ; Prosecký, Vít (referee) ; Kubíček, Jaroslav (advisor)
The thesis deals with the topic of silver coating on the inner surface of the tubes made of aluminum alloy EN AW-6101B. The high affinity of the aluminum for the oxygen, the heterogeneity of the surface and the presence of the hydrogen in the base material, are the properties which hinder the formation of metallic coating on the surface of the aluminum alloy. The saturation of the base material with the hydrogen, e.g. due to the pretreatment of the surface or by the process of creating of coatings, may under certain conditions cause the defects of the silver coating in the form of the bubbles (blisters). Other factors that may affect the quality of the silver coating are the way of creating of the interlayer and the conditions for the electrolytic deposition of the silver.
Influence of shape of the electrode to weld pool
Hrádek, Jan ; Vaněk, Mojmír (referee) ; Kubíček, Jaroslav (advisor)
The project is focused on welding of TIG method. In this method is used non-melting tungsten electrode, which can have different top angles. In different literature there are different opinions about how angle influence weld pool. It was sharpen six different angles of electrode with whom was done welds on carbon steel S235JR and on austenitic corrosion resistant steel x5CrNi1810. The evaluation was done with help of chart where on the axis x is angle of electrode and on axis y are depth and width weld in millimiters. The result of this project was the prove of opinion that with more sharper angle of electrode is depth of weld smaller and width bigger.
Technological process of forging die repair
Kriegsmann, Luděk ; Vaněk, Mojmír (referee) ; Kubíček, Jaroslav (advisor)
The bachelor thesis presents a proposal and solution of renovation of forging insert, which is made of tool steel 1.2367. Due to the literature search, manual electric arc welding with coated electrode was chosen for renovation. The work deals with the stress of the forging insert, which was carried out by strength and thermal analysis. After performance of trial overlay by several coated electrodes, hardness measurement and calculation of dilution of materials was performed. Based on these results, electrode Capilla 66 was selected. Renovation of insert was performed according to preliminary technological process pWPS. The Insert was preheated to 300 °C. As a power source was used TransPocket 3500 and welding current was 190 A.
Welding of steel austenitic
Šmarda, Vladimír ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
This thesis deals with welding of austenitic steel, which used in pipelines for liquids in the Dukovany Nuclear Power Station, and suitable technology for welding of joints. Firstly, there is introduced the distinction between the types of stainless steel. Concerning the austenitic steel there are stated their features and defects during welding. Secondly, the bachelor thesis deals with commonly used welding method: MMA, MIG/MAG and TIG, which is most frequently used for weld joints in the Dukovany Nuclear Power Station. A part of the chapter is devoted to progressive TIG methods, such as: use of hot wire and orbital welding of pipelines. In the experimental part, there is solved a proposal for a method and a technique for weld joint between two chambers of tubular cooler. The dimension of the pipeline flange is according to DN 400. It is a butt weld in V-shape with permanent pad on the inside of the pipe, which is welded with TIG method. On the basis of the NDT verification test and also destructive testing, there was proved that the chosen method, technology and additional material were optimal. In the part of experiment evaluation, there were summarized all the results of the tests. Eventually, the suggested weld joint was recommended for realization.
HSS welding process automation in nuclear power plant
Charvátová, Eliška ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The bachelor thesis compares the manual and mechanized method of welding in the production of dissimilar weld joint. The samples were welded from austenitic and ferritic-perlitic parent materials with using the same type of high alloy filler material. Joint geometry is identical for both methods. Nondestructive and destructive controls were performed, the structural changes in the materials given by the different amounts of heat transfer into the weld joint were compared. Increasing the corrosion resistance of the inner pipe surface is ensured by nickel layer.
Comparison of properties of butt joints welded by laser and plasma for austenitic and ferritic stainless steel
Zajíc, Jiří ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The thesis is focused on evaluation and comparison of welds made by welding technologies using laser and plasma. For the purpose of comparing those technologies, were chosen austenitic stainless steel x5CrNi18-18 and ferritic stainless steel X6Cr17. These materials were chosen for their diversity in properties gained by high temperatures that go along with most welding processes. First part of the thesis is focused on description of welded materials and technologies of laser and plasma welding. In following experimental section, the thesis is focused on evaluation of welded samples, made for this purpose. Samples were examined for metallography, specifically macrostructure and microstructure. Followed by tensile test of mechanical properties and microhardness test.
Welding of the sanitary gully
Skalník, Vít ; Vaněk, Mojmír (referee) ; Kubíček, Jaroslav (advisor)
The aim of this paper is to plan out and realize an optimalization for the welding process of parts of a sanitary gully. Problematics during the welding process of the aforementioned parts together with the usage of welding fixture were explained. On the basis of characteristic signs of welding, an application of other methods was evaluated and the optimal option for the welding process was chosen. During the selection process, hygienic regulations of a non-state funded organization EHEDG (European Hygienic Engineering and Design Group) were taken into account. Furthermore, suggestions for adjustments of the welding process of the forefront of the gully were analyzed. The next step was the realization of the chosen plan and its testing. Part of the process was the implementation of a technological procedure and execution of WPS (Welding Procedure Specification). The end of this paper considers the tecnological-economic contributions of the changed in the procedure.
Hybrid bonded joints
Godál, Samuel ; Hanáčková, Pavla (referee) ; Kubíček, Jaroslav (advisor)
In the practical part of this bachelor thesis, 5 threaded joints were made with semi-rigid pressing threads, 3 samples with glued joint using Sikaflex-222i UV adhesive and 5 hybrid bonded joints using semi-rigid pressing threads and Sikaflex-222i UV adhesive. All the bonded sheets were made of AlMg1. The tensile test results showed that the load was best resisted by the riveting samples. Adhesive samples did not achieve the required load resistance because the adhesive did not have the correct adhesion to the substrate. Hybrid glued joints have also not reached the required quality. This was due to the cutting of the bottom of the joint with a pressing thread and the formation of an adhesion fracture.
Thermal spray coatings of bioceramics
Kašpárková, Kristýna ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
Bachelor´s thesis is focused on thermal spraying bioceramics. Bioceramic is designed to replace damaged parts of the human body. Practical use is mainly in orthopedics, jaw and facial surgery. This category of materials includes hydroxyapatite, which is characterized by biocompatibility and the ability to form a strong bond between the bone and the implant. The experimental part of the thesis was spraying 40 - pieces of dental implants for the company LASAK s.r.o. Plasma spraying technology was used to apply the hydroxyapatite coating. The required coating thickness was 60 m. The implant was sprayed and cleaned before spraying. Spraying was carried out in the laboratory of plasma coatings dental and skeletal implants ÚST FSI VUT Brno. A dimensional control was performed after plasma spraying.
Design of ceramic coating for disc brake of bicycle
Eliáš, Vojtěch ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
This Bachelor Thesis deals with the design of ceramic coating on a braking rotor of a bicycle and its implementation. The reason for this is the achievement of better heat resistance as well as better abrasion resistance, which are typical properties of ceramic materials. The method of heat plasma spraying was employed in order to apply the coating. The coating material consisted of the binding layer made up by 95% Ni and 5% Al and of the outer (superficial) layer made up by 92 % ZrO_2 and 8 % Y_2 O_3 . After the coating had been sprayed, the rotor was tested in real conditions of a bicycle ride. Considering the absence of the necessary measuring equipment, the testing was only based on the rider's subjective feelings. The sprayed coating showed slightly worse friction properties compared to conventional steel, however, the functionality of the braking device was not significantly limited.

National Repository of Grey Literature : 198 records found   previous11 - 20nextend  jump to record:
See also: similar author names
1 Kubíček, J.
20 Kubíček, Jan
9 Kubíček, Jaromír
3 Kubíček, Jindřich
1 Kubíček, Jiří
1 Kubíček, Josef
1 Kubíček, Jovan
20 Kubíček, Ján
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