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Laser cutting
Baran, Marek ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The thesis elaborates cutting of thick sheet metal using the laser technology. Beside technological aspects of laser cutting, the project also deals with utilising laser technologies in practice and compares laser cutting to other ways of cutting sheet metal. The experimental part, which was realized in STEELTEC CZ, was concerned with optimization of focal point for cutting 20 mm sheet metal of S235JR. The samples which were cut on a CO2 laser were compared to samples made by plasma and water cutting machines. The researched parameters were roughness, shape, time and price.
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Welding of heat - resistent steels by narrow gap SMAW method.
Lukosz, Ondřej ; Kubíček, Jaroslav (referee) ; Daněk, Ladislav (advisor)
LUKOSZ Ondřej: Welding of heat - resistent steels by method SMAW into the narrow gap. The project elaborated in frame of engineering studies branch 2307. The project is submitting design of technology production of the weld procedure creep metal. It uses in manufactory power equipment. The power equipment, the type of steam turbine, uses steel 30CrMoNiV 5-11. The welding into the narrow gap has its specifics. The most important parameter is the choice of flux and filler metal. We must decide appropriate flux for convenient disposing of slag. Based on the literature study these problems were proposed the specified welding procedure, appropriate flux and appropriate additional material. For the experiment was selected appropriate temperature of preheating.
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Analysis of application electron beam in industry
Rudyk, Martin ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The bachelor´s thesis analyses individual methods of usage electron beam in an industrial practice, as a welding, machining, deposition, heat treatment material and gravure. As well it compares individual application with anologous method of special fusing welding like a laser welding. It describes his benefits and disadvantages, principles of the beam rise, etc. In the thesis a welding equipment, its function, weld metal connections for various materials, weldability of the different materials are described.
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The repair procedure of the press frame
Švarc, Lukáš ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
The diploma thesis is dealing with the repair procedure of the cracked ram of the press – machine parts made from gray cast iron by casting. The ram is a part of the repaired forming press LET 160. The presented work contains an overview and analysis of the technologies of repair of cast iron by welding. On the basis of the theoretical part is designed the procedure of repairing. The aim of the experimental tests is selecting the most suitable additional materiál and verifying the proposed welding process. The welding method was selected by a low preheating manual metal arc. All the pWPS were prepared for the welding of all test specimens. Experimental samples were subjected to visual, macroscopic, microscopic analysis and hardness measurement. Based on the results of the experiments was suggested a welding repair procedure with a pWPS.
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Renovation of casting molds by laser cladding technology
Cicha, Tereza ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The diploma thesis deals with study of laser cladding technology and possibilities of its use in renovation of casting molds made of hot-work tool steel. The theoretical part describes methods of laser cladding, testing methods and characteristics of the base material and its heat treatment. In the experimental part the test clads, and the metallographic samples were made. The samples were evaluated in terms of macrostructure and microstructure, especially clad geometry, dilution, and defects like pores and cracks. Microhardness was also measured. In conclusion a technical and economic evaluation was performed.
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Assessment of heterogeneous properties butt welds in laser welding and electron beam welding
Rozsypal, Oldřich ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The project was developed within the engineering degree in engineering technology, and is focused in welding together of two different materials. Welds will be done on a high strength steel Domex 420 MC and deep drawing steel DC01 using laser welding, and will be compared with the method of electron beam welding. Part of this project is a scientific research describing the basic physical principles of both methods, different types of lasers, welding material properties and inspection of welds. In the experimental part was carried tensile test, macroscopic and microscopic examination. Finally, work is to evaluate the individual tests.
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Welding of fuel filters
Průža, Štěpán ; Suchánková, Ivana (referee) ; Kubíček, Jaroslav (advisor)
PRŮŽA Štěpán: Welding of fuel filters. This project, worked out in within engineering studies, branch M2307 – 02 Manufacturing technology, submits suggestions for decreasing of scrap during production – mechanized welding of fuel filters made out of aluminum EN AW – Al 99,5 using WIG/TIG methods. The theory is focused on arc welding issue. Verification of possible influences on the weld joints was tested during following experiments: top cover misalignment against the body of the filter, top cover deformation, gas flow, welding parameters setup, welding area purity, mechanization propositions. Evaluations of experiments – recommendation for elimination and prevention of bad quality weld joints. Key words: Welding, aluminum EN AW – AL 99,5, WIG/TIG method, weld’s joints defects, experiment, evaluation.
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Stick welding carbon and high-alloy steels
Hendrych, Marek ; Vaněk, Mojmír (referee) ; Kubíček, Jaroslav (advisor)
This thesis deals with analysis of manual metal arc welding method or method 111. In the research part of this thesis are discused principles of this method, welding power sources and additional welding material-coated elecrodes. Further the thesis is focused on the weldability of steels, especially carbon steels and austenitic stainless steels. In the experimental part was accomplished measurement of operational characteristics of coated electrods. Measurement was carried out on sample of cabon steel S235JR according to ČSN EN and austenitic stainless steel X5CrNi18-10 accordig to ČSN EN. The evaluation envolves a comparison of the results and their justifications.
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