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Nickel alloy overlay welding parameters optimalization
Lauš, Lukáš ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The aim of these master's thesis is to choose and optimize parameters of the Venturi tube throat weld cladding. The Venturi tube is made from carbon steel ASME SA-106 Grade C. The weld cladding is performed by plasma transferred arc welding. The throat is weld overlaid with nickel base powder Inconel 625. The overlays are made without oscilation. The main requirement was to find a maximum possible powder feed rate and others welding parameters to develop maximum welding speed and productivity on automat. Visual and penetrant testing on the overlays were performed. Metalographic samples were prepared. On the samples was meassured dilution, overlay thickness and width of the heat affected zone. Results are compared with parameters succesfully used in the cooperating company.
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Modeling of cavitating flow
Frölich, Kamil ; Klas, Roman (referee) ; Rudolf, Pavel (advisor)
his thesis deals with the problems of cavitation flow in a Venturi tube. It is made for a multi-phase (water-vapour) flow calculation of two geometry tubes. Results of numerical calculations for the flow geometry (dimensions) are compared with performed experiment. Numerical flow calculation was performed in the Fluent 2.3.26.
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Proposal nozzle for measuring the air quantity of an internal combustion engine
Esterka, Ondřej ; Charvát, Pavel (referee) ; Štětina, Josef (advisor)
In this bachelor‘s thesis are mentioned emission standards, which apply to passenger cars, and the mixture-control system. There is also a research of volumetric and sectional flowmeters, suitable for measuring the flow volume of the air, including the principle of measuring the volumetric or mass flow. After that follows engineering design of Venturi tube for measuring the flow of the air through the chosen combustion engine. The design is based on the appropriate standard. There is also involved a welded assembly drawing of the Venturi tube, and a description, how to use the tube in a test room.
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Automatized working place for measuring of airflow parameters
Smělý, Jakub ; Vejlupek, Josef (referee) ; Vlach, Radek (advisor)
This thesis describes the design work for the measurement of air values. The first part describes the airflow, pressure build-up in pipes and losses due to airflow losses. There is also a description of fans and explain their characteristics depending on the pressure generated by airflow. The next part describes the design of the measuring chamber, electronics and control for fully automatic measurement of air quantities.
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Replacement of nickel alloy overlay by manganese alloy overlay
Hlobil, Albert ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The thesis is focused on the issue of tuning the welding process of the 18.8. Mn alloy using the method 152. The welded component is the cylindrical throat of a Venturi tube made of ASME SA-106 Grade C carbon steel. A series of welds were performed, which were qualitatively evaluated and compared. Metallographic sections were made, and the dilution, excess, and width of the heat-affected zone were determined. Evaluation of microstructure and microhardness were also performed. Based on the tests performed, suitable welding process parameters were used. For comparison, a test for chemical and salt mist corrosion was undertaken, where the corrosion resistance of the 18.8. Mn alloy weld was compared to Inconel 625 alloy.
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Nickel alloy overlay welding parameters optimalization
Lauš, Lukáš ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The aim of these master's thesis is to choose and optimize parameters of the Venturi tube throat weld cladding. The Venturi tube is made from carbon steel ASME SA-106 Grade C. The weld cladding is performed by plasma transferred arc welding. The throat is weld overlaid with nickel base powder Inconel 625. The overlays are made without oscilation. The main requirement was to find a maximum possible powder feed rate and others welding parameters to develop maximum welding speed and productivity on automat. Visual and penetrant testing on the overlays were performed. Metalographic samples were prepared. On the samples was meassured dilution, overlay thickness and width of the heat affected zone. Results are compared with parameters succesfully used in the cooperating company.
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