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Weldability problems of duplex mixer blades
Bryksí, Petr ; Záděra, Antonín (referee) ; Sigmund, Marian (advisor)
The diploma thesis deals with the analysis of the causes of fracture of axial stirrer blades made of duplex material 1.4462 for gypsum suspension in Ledvice Power Plant. The theoretical part deals with the problem of welding of duplex steels. The practical part of the work includes the procedure from the preparation of the sample for metallographic, fractographic observation, chemical composition and hardness test. For our experiment, areas at the fracture point were cut out from the supplied blades and then measurements were made on them. Subsequently, we then evaluated the measured data at the fracture site of the blades and the weld joint area. Based on the analysis, technological and design recommendations for further blade production were made.
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Progressive anticorrosive metal materials
Bombera, Mojmír ; Kaňa, Václav (referee) ; Šenberger, Jaroslav (advisor)
This bachelor thesis is aimed at stainless steels problem. At the beginning history of steel and one of the biggest issue of steel, corrosion is described. Next part show basic type of stainless steels, their material characteristic, properties and possibilities of usage. After that metallurgy of stainless steels and process follows. In last topic of this bachelor work samples of usage in various branges are presented.
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Arc welding of stainless steels for demanding working conditions
Matějíček, Josef ; Hála, Michal (referee) ; Kubíček, Jaroslav (advisor)
Bachelor thesis introduced deals with Arc welding of stainless steel. With welding technology, used by company DIAMO, the connected pipes, flanges and plates are for guiding the Sodium Sulphate solution, which is obtained as by-product in production of Uranium. Corrosive attack and weld cracking occurs in the short period of time due to the chemical reaction. Based on information about materials, used additional materials and welding technology used I have evaluated materials with susceptibility to the corrosion and the formation of hot cracks. Using tests and calculations I have examined the susceptibility of austenitic stainless steel to intergranular corrosion. Austenitic-ferritic stainless steel was also used as a theoretical solution for larger spectrum of materials. After calculations and evaluations of the trial tests I have conducted discussion and recommendations for use in practice.
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Weldability problems of duplex mixer blades
Bryksí, Petr ; Záděra, Antonín (referee) ; Sigmund, Marian (advisor)
The diploma thesis deals with the analysis of the causes of fracture of axial stirrer blades made of duplex material 1.4462 for gypsum suspension in Ledvice Power Plant. The theoretical part deals with the problem of welding of duplex steels. The practical part of the work includes the procedure from the preparation of the sample for metallographic, fractographic observation, chemical composition and hardness test. For our experiment, areas at the fracture point were cut out from the supplied blades and then measurements were made on them. Subsequently, we then evaluated the measured data at the fracture site of the blades and the weld joint area. Based on the analysis, technological and design recommendations for further blade production were made.
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|
|
Arc welding of stainless steels for demanding working conditions
Matějíček, Josef ; Hála, Michal (referee) ; Kubíček, Jaroslav (advisor)
Bachelor thesis introduced deals with Arc welding of stainless steel. With welding technology, used by company DIAMO, the connected pipes, flanges and plates are for guiding the Sodium Sulphate solution, which is obtained as by-product in production of Uranium. Corrosive attack and weld cracking occurs in the short period of time due to the chemical reaction. Based on information about materials, used additional materials and welding technology used I have evaluated materials with susceptibility to the corrosion and the formation of hot cracks. Using tests and calculations I have examined the susceptibility of austenitic stainless steel to intergranular corrosion. Austenitic-ferritic stainless steel was also used as a theoretical solution for larger spectrum of materials. After calculations and evaluations of the trial tests I have conducted discussion and recommendations for use in practice.
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|
|
Progressive anticorrosive metal materials
Bombera, Mojmír ; Kaňa, Václav (referee) ; Šenberger, Jaroslav (advisor)
This bachelor thesis is aimed at stainless steels problem. At the beginning history of steel and one of the biggest issue of steel, corrosion is described. Next part show basic type of stainless steels, their material characteristic, properties and possibilities of usage. After that metallurgy of stainless steels and process follows. In last topic of this bachelor work samples of usage in various branges are presented.
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