National Repository of Grey Literature 183 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
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.
Welding head of the longwall shearer
Adam, Karel ; Sigmund, Marián (referee) ; Kubíček, Jaroslav (advisor)
The aim of this bachelor thesis is to describe the structure and purpose of the longwall shearer drum to descriebe the technological process and to design the technology. Shearer heads are made by welding, MAG method with a protective atmosphere of CORGON 18 (18% CO2 + Ar) was selected. Increasing the strength of the knife holders, made from steel 15 230.3 to 1600MPa and welding to the helical segment of S355J2 + N steel, these clamps cracked cold. An error has been detected by reviewing the entire process and performing calculations. The preheating temperature was too low and was therefore increased to 270 ° C along with the stay for 2 hours at this temperature. Part of the thesis is a sample of the test weld of the rupture holder.
Proposal of technological procedure for welding pressure vessel
Reich, Martin ; Sigmund, Marián (referee) ; Kubíček, Jaroslav (advisor)
The work presents a proposal for a suitable technology for the welding of the pressure vessel of the LPG gas phase separator. There are three different methods of welding of the separator body proposed and the economics of producing the separator for a given series of pieces is assessed. There is a comparison of hand electrode welding, MAG welding and TIG welding. Further, a brief overview of possible types of non-destructive testing is added and the three selected tests are properly executed and detailed. An overall evaluation of the experiments performed is included and the possible future development outlined.
Influence of fluxes on weld metal properties
Holub, Kamil ; Sigmund, Marián (referee) ; Kubíček, Jaroslav (advisor)
This thesis deals with the topic of submerged arc welding – an electric arc method of fusion welding, that uses a layer of granulated flux to shield the weld pool from atmospheric gases. Theoretical part is devoted to the description of the welding method and fluxes currently used. The practical part contains an experiment, which consists of making two weld deposits on structural steel S235JR by using different fluxes. First weld deposit is made with OK 10.62 Flux. The same flux alloyed with the Tribaloy T-800 laser cladding powder is used for the second weld deposit. Test specimens are examined on the basis of influence of fluxes combined with a single electrode wire.
Bonding in the automotive industry
Krejčí, Adam ; Hanáčková, Pavla (referee) ; Kubíček, Jaroslav (advisor)
The thesis presents a literature study of adhesive bonding technology. The work deals with the advantages and disadvantages of adhesive bonding, design of adhesive joints, technological processes of adhesive bonding and the division of adhesives. The thesis also discusses various materials used for the construction of car bodywork and their properties. The main focus of the work is on the use of adhesive bonding in the car industry, comparing traditional and modern technology used for the construction of bus bodywork. In the experimental part of the thesis, the aim is to reveal the influence of surface treatment on the resulting shear strength when employing metal to metal bonding.
Bonded hybrid joints in the automotive industry
Ševčík, Jan ; Hanáčková, Pavla (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis deals with bonded hybrid joints which are used for connecting parts of modern coachwork. Firstly, the thesis describes in general the process of production of the whole coachwork, from cutting of the blanks to the surface treatment including the analysis of the used materials. Subsequently, the problem of joining body parts through adhesives, but also by welding, soldering or other methods is discussed. Another part of this thesis is dedicated to an experiment in which the qualities of bonded hybrid joints were determined. Different ways of realizing the joint have been made which differed in the size of the glued surface, in the welding methods and in the process of their creation. The produced joints were tested for their strength and quality.

National Repository of Grey Literature : 183 records found   1 - 10nextend  jump to record:
See also: similar author names
1 Kubíček, J.
19 Kubíček, Jan
9 Kubíček, Jaromír
3 Kubíček, Jindřich
1 Kubíček, Josef
1 Kubíček, Jovan
19 Kubíček, Ján
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