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Procedural parameters at Inconel 625 cladding
Hrádek, Jan ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The research is focused on cladding of inconel 625 using the MAG - CMT method. It was found that welding without an oscillation does not create the necessary geometry to establish additional layers. When welding with an oscillation, it was researched that the current between 150 and 200 A appears most appropriate in the synergistic mode for welding inconel 625. The resulting weld bead was made at a current of 190 A with pulse dynamics correction set to -4 and correction of arc length to +10 and welding speed of 315 mm per minute.The weld bead was not ideal mainly due to insufficient height. The improvement of results could be achieved by set oscilation with fluent change in acceleration. Because of the time options and difficulty of programming it was used only constant speed for all experiments.
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Renovation of wood flaker rotor blades by flux cored wires
Soldán, Jan ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The bachelor thesis presents a state of renovation of wood flaker rotor blades by flux cored arc welding. The theoretical part of the thesis presents posssible ways of renovations with materials included. Subsequently, in order to find out, which one of two flux cored electrodes are more suitable for this specific renovation, the experiment was made. The flux cored electrodes were compared in heat input, price, micro and macro structure and final hardness of welded material. Due to very high hardness results, the flux cored electrode named Megafil A760M was chosen to be used in the renovation. At the end of the thesis, the specification of welding process was according to EN ISO 15 609-1 standard.
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Plasma overlay welding of cobalt alloy
Paleta, Petr ; Daněk, Ladislav (referee) ; Sigmund, Marian (advisor)
The thesis deals with plasma overlay welding of cobalt alloys. In the theoretical part of the thesis, suitable cobalt alloys for plasma overlay welding were described, out of which cobalt alloy Stellite 21, was chosen for overlay welding for particular part. Subsequently, the plasma overlay welding machine PPC 250 PTM and the torch PHP 250 S, used in the practical part, were described. In the practical part were debug overlay welding parameters and suggest the suitable overlay welding procedure for particular part.
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Repair of crane wheel by welding
Jireš, Daniel ; Kubíček, Jaroslav (referee) ; Daněk, Ladislav (advisor)
Diploma thesis examines the most appropriate solution of filler materials, suitable technology and welding parameters for the renovation of the crane wheel. Five different filler materials were suggested and have been subject of macroscopic examination and measurement of quality - primary the hardness of the weld deposit. Additional materials have been chosen to design a mobile weld system, which does not count with the possibility of preheating the base material. As the most suitable filler material, which satisfy all the requirements that emerged STEIN-MEGAFIL A 740 M.
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Comparison of cladding by the electron beam and plasma process
Rudyk, Martin ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis deals with plasma cladding and electron beam cladding. The theoretical part is divided into several chapters which is focused on description of these methods of cladding process. In the practical part the particular experiment of electron beam cladding (EBC) and plasma cladding (PC) is described. In the conclusion overall results were assessed, both methods were compared each other and possible exploitation in industry was described.
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Anticorrosive protection of steam turbines rotors surface
Špičková, Petra ; Kubíček, Jaroslav (referee) ; Daněk, Ladislav (advisor)
This project was elaborated under the graduate major program 2307 of masters engineering studies. It presents a proposal of anticorrosive protection of steam turbines rotors surface. Based on a literature recherché on automated welding and surfacing under flux, an optimized technology of surfacing of anticorrosive and antierosive layers at output parts of low-pressure sections of rotors will be presented. The optimization of the welding technology will be performed to minimize the possibility of hidden cracks due to application of anticorrosive protective surface and will be evaluated on test samples provided by the company SIEMENS.
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Numeric simulation of surfacing turbine rotors pinot pins
Tkaný, Jan ; Mrňa, Libor (referee) ; Daněk, Ladislav (advisor)
The master´s diploma thesis elaborated as the master's degree M-STG Manufacturing Technology solves surfacing problems in the simulations of surfacing turbine rotors pinot pins. The work was seen as a preparatory work before the real surfacing. Topic commissioned by Siemens Industrial Turbomachinery Ltd. For welding plates test has been used the method of SAW and the base material was identical to turbine rotor material, X22CrMoV 12-1. Additional material was Fluxocord 42. Simulations were carried out in programs SYSWELD and Visual - WELD. The output of the simulation software are temperature and stress fields, material structures and creations of the CCT diagrams at the base material, filler material, and mixed area.
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Numeric simulation of the turbine rotor surfacing
Durajová, Věra ; Slováček, Marek (referee) ; Daněk, Ladislav (advisor)
The project elaborated in frame of engineering studies, solves the problem of restoration of the damaged hinge groove blades, and the surfacing of cylindrical faces of the SAW method, using additional material TOPCORE 838 B. The turbine rotor is made from steel with high resistance temperature 30CrMoNiV5-11. Based on literature studies and issues surfacing calculation, it was established that will preheat the material. The issue was solved by using simulation program SYSWELD.
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