|
|
Comparision of FEM models of joints
Hlaváč, Martin ; Hrůza, Václav (referee) ; Pokorný, Přemysl (advisor)
This thesis deals with the comparison of alternative models of the simplified joints used in the FEM models of complex models with detailed joint details. This is essentially a screw connection with dowel bolt and standard bolt, weld connection "T" and overlap weld connection. Individual connections are compared in the simulation results of matching models.
|
|
|
Weldability of steels for steam turbine parts
Jech, David ; Hutařová, Simona (referee) ; Juliš, Martin (advisor)
The aim of contemporary standard welding technologies is to create compact welds with high value of solidity and toughness in laboratorial and operational conditions. This welding technology is asserted in new creep - resisting steels on basis of steel CrMoV and CrMoNiV, which have high value of solidity and creep - resistance. The thesis deals with problems connected with the weldability of steels for steam turbine rotors and it´s aim is to interpret the structural and mechanical features of the weld joint for material combinations under consideration. For the assessment of weld joint features has been used measuring of micro hardness and hardness according to Vickers, microstructure was observed by methods of light microscopy.
|
|
| |
|
|
Orbital welding assembly welds in the Nuclear Power by the TIG method
Lukášek, Zdeněk ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The Bachelor's thesis looks at the possibility of using orbital welding by the TIG method on mounting welds in JE Dukovany. In the opening section, we deal with the issue of weldability, primarily carbon steels. Furthermore, the work focuses on TIG welding technology, both in the manual and mechanised way it details, including the advantages and disadvantages of both variants. In the experimental section, five test samples of ferric-perlithic material pipes were welded. The samples were assembled to simulate possible combinations that occur during pipeline assembly. Non-destructive and destructive controls followed, verifying the quality and mechanical properties of the resulting weld joints. In conclusion, the results of the trials were assessed and evaluated.
|
|
|
Orbital welding assembly welds in the Nuclear Power by the TIG method
Lukášek, Zdeněk ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The Bachelor's thesis looks at the possibility of using orbital welding by the TIG method on mounting welds in JE Dukovany. In the opening section, we deal with the issue of weldability, primarily carbon steels. Furthermore, the work focuses on TIG welding technology, both in the manual and mechanised way it details, including the advantages and disadvantages of both variants. In the experimental section, five test samples of ferric-perlithic material pipes were welded. The samples were assembled to simulate possible combinations that occur during pipeline assembly. Non-destructive and destructive controls followed, verifying the quality and mechanical properties of the resulting weld joints. In conclusion, the results of the trials were assessed and evaluated.
|
|
|
Steel Structure of the Technology Building
Paroulek, Adam ; Pilgr, Milan (referee) ; Brosch, Petr (advisor)
The diploma thesis deals with the design of a steel technological structure in the locality of Štětí. The struture is used for the paper production technology. The geometry of the structure was customized to technological requests. The statistic system was considered in two versions – joint connections and frame – joint connections. The frame – joint connections system was chosen for detail processing. The steel structure was calculated by Scia Engineer 19 software. The connections were calculated by Idea statica software. The thesis is processed according to valid standars of ČSN EN.
|
|
|
Structural analysis of austenitic weld joints
Procházka, Robert ; Foret, Rudolf (referee) ; Havlík, Petr (advisor)
The bachelor thesis deals with structural analysis of austenitic weld joints by using methods of material science. The theoretical part of the thesis summarizes the problematics of welding of high-alloy steels. After the general definition of welding and weldability of high-alloy steels, the thesis focuses on structural adjustments including welding defects during the welding process. Selected methods of fusion welding that were used to create these welds are mentioned in the second half of the theoretical part. The experimental part covers the structural analysis of the welds, which consists of microstructure evaluation, chemical composition analysis, and microhardness test.
|
|
|
The production of the console deburring machines
Hlavinka, Martin ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This thesis submitted deals with the project of the change of the production of the semi-finished product of the console which is produced by casting from the cast iron ČSN 42 2420. The component forms the frame of the deburring machine with two electric motors with the gearbox. For the suggested production the method MAG of technology welding was chosen. Because of the given technology the new construction of the component was chosen. The welded product consists of eight parts burnt from heavy-walled sheet metals. The suggested material of the construction is steel S235JR and for welding the filler rod Weld G3Si1, diameter 1 mm is chosen. For the determination of the optimal parameters of welding the testing through the slap next to the skin weld (size a5) was made. Simultaneously with the testing the fracture areas and the weld root were examined. The suggested parameters of welding were used during the preparation of WPS. For the assembling of the component the operating schedule of welding is planned.
|
|
| |
|
|
Structure and properties of weldment of rotor steels
Jech, David ; Jan,, Vít (referee) ; Foret, Rudolf (advisor)
The object of this thesis is to assess the structural stability of heterogeneous weld joint, which consists of two different base materials (16,537 steel and 16,236 steel) and weld metal NiCrMo2.5-IG with buttering layer P24-IG. All these materials belong to the group of low-alloyed creep-resistant steels that are to be used mainly in the power industry. The weld joint was made by application of the TIG hot wire welding method. Structural stability of this joint was evaluated by carbon redistribution and microstructural changes after annealing in temperature 300 °C and 400 °C during 500 hours. For modelling the phase composition of particular steels was used the ThermoCalc software. All gained results should be employed to appraise whether the heterogeneous weld joint of the steam turbine´s rotor is eligible for long-term operation in hard working conditions.
|
guest ::
