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Welding of high strenght steel by laser
Číp, Tomáš ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
This project, elaborated within the engineering studies (code of field of study: N2301), presents experiment of welding of high-strength steel by laser. In this project, the samples of high-strength steel DOMEX 420MC will be welded by laser welding method and the welded joints will then be compared with welds made by MAG method. The theoretical part of this project summarizes the following key words in individual chapters: lasers, technology of welding of steel using laser, welding by MAG method, steel with higher strength, types of defects and check of welded joints. The practical part contains description of and assessment of mechanical tests of welded joints – weld bending test and transverse tension test. Further on, the tests of macrostructure and microstructure of welded joints were conducted and assessed. Final results of whole experiment are reviewed at the end of my diploma thesis.
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Design of bearing bracket welding process.
Houdek, Aleš ; Janík, Martin (referee) ; Daněk, Ladislav (advisor)
The thesis deals with a draft production procedure for a specific welded component of a bearing console, including the consideration of the basic material welding quality, the selection of welding method and parameters, thermal processing, if applicable, and the selection of filler material. Draft welding procedure of WPS and weld check. Consideration of the use of a robot.
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Welding of turbine rotor materials
Palán, Marek ; Vaněk, Mojmír (referee) ; Daněk, Ladislav (advisor)
This thesis deal with the basic problems of welding rotor materials. It describe the essence of welding and ways of detecting defects caused by welding. Furthermore, it is covered in more detail the formation of heterogeneous welds and the impact of individual elements in the weld on the properties of the resulting weld. It lists detailed breakdown of creep-resistant steels and principles of their heat resistance. The thesis gives an overview of welding used in welding rotor materials and various methods are described. The work also includes commissioning of thermal processes in welding. In the experimental part is evaluated macrostructure, hardness and the method used in the implementation of the cladding material 26NiCrMoV14-5.
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Welding of titanium alloys using electron beam
Schiffer, Martin ; Foret, Rudolf (referee) ; Havlík, Petr (advisor)
This bachelor´s thesis is focused on issue of welding of titanium alloys using electron beam. It is dedicated to description of principle of electron beam welding technology. There is described interaction of electron beam with the welded material, electron beam characterisation and configuration of device for electron beam welding. Next part is focused on evaluation of weldability of titanium alloys. It includes general description of weldability of materials, description, distribution and weldability of titanium alloys and finally evaluation of effect of electron beam welding on the microstructure. As an example, there is described effect of EBW on mechanical properties of alloy Ti-6Al-4V. In the end this technology is compared with other methods of fusion welding as laser beam welding, arc welding methods and plasma arc welding.
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Laser welding of steels
Křivan, Miloš ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The project elaborated within the bachelor‘s degree field of B-STI Mechanical Engineering is focused on the problems of laser welding of steels. The theoretical part of this project deals with lasers, methods of laser welding, effects of welding parameters on weld quality and the weldability of steels. In the practical part sheets that were made of S355J2G3 and S355J2C+N steels were butt welded. The aim of the practical part was a determination of such welding parameters as the welded joints meeting the quality requirements according to ČSN EN ISO 13919-1 standard and the hardness requirement less than 380 HV10 according to ČSN EN ISO 15614-11 standard. The tests of the macrostructure of the welded joints were conducted and assessed and the hardness of the welded joints was measured.
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Welding Basic Course on 135 Technology
Dolejský, Tomáš ; Opletal, Jan (referee) ; Kubíček, Jaroslav (advisor)
TOMAS DOLEJSKÝ: Welding Basic Course on 135 Technology. The project developed within the framework of the bachelor's study of a branch Engineering technology presents a proposal for a theoretical and a practical parts of the welding basic course with a method 135 in accordance with the curriculum of Czech Welding Society-ANB. The latest norms or up to the present time still valid ones are presented in the project. A theoretical part contains a necessary minimum of requirements for participants of the welding basic course. In the chapter of a welding technology is presented a practical part of this welding process and important principles for a required quality of welded joints according to long-time experience. In a conclusion there is an interpretation of a norm ČSN 05 0705 according to what welding basic courses are realized and a welding process WPS is presented here and a proposal of examining tests for a passing an exam in a welding basic course.
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New materials in welding technology
Křížek, Stanislav ; Janík, Martin (referee) ; Daněk, Ladislav (advisor)
The bechelor work elaborated in frame of studies branch B2339 deals with weldability of new kinds of steel especially about high-strength steel. This is a literary pursuit that includes problems with weldability, that means standing heat deformation cycle on defect activity in welding connection.
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Vizualizace procesu tavného svařování
Kraus, Jan
The presented work deals with a rating of the welding process from the view of welding possibility based on a nondestructive testing record by an acoustic emission passive method (AE). The measuring are carried out on guaranteed welding materials and difficult welding materials. The material (metal-graphic and frakt-graphic) and mechanic verification of a weld creation is placed after the welding process and the reaction of the metals with a different chemical composition. There is also the analysis of the AE records depending on the material states during a formation of a fusible and resistance joint.
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