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Influence of fluxes on weld metal properties
Holub, Kamil ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
This thesis deals with the topic of submerged arc welding – an electric arc method of fusion welding, that uses a layer of granulated flux to shield the weld pool from atmospheric gases. Theoretical part is devoted to the description of the welding method and fluxes currently used. The practical part contains an experiment, which consists of making two weld deposits on structural steel S235JR by using different fluxes. First weld deposit is made with OK 10.62 Flux. The same flux alloyed with the Tribaloy T-800 laser cladding powder is used for the second weld deposit. Test specimens are examined on the basis of influence of fluxes combined with a single electrode wire.
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Laboratory Device for Measuring Headphones
Holub, Kamil ; Číž, Radim (referee) ; Schimmel, Jiří (advisor)
This bachelor's thesis deals with the design and assembly of headphones test fixture. The introduction describes the types of headphones, their classification in terms of design and their typical specifications followed by a description of instruments for measuring headphones, defined by standards ČSN EN 60318 and their classification in terms of design and use. The following part is devoted to a design of a test fixture, which is subsequently put together using 3D printing. As part of the thesis, the measurement of frequency response and input impedances of various headphones is performed on the fixture. These are then compared with measurements on professional measuring devices. In the last part is described a laboratory task, which includes the measurement of headphones using this test fixture.
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Welding of deep-drawing steels with a protective layer by means of an oscillating laser beam
Holub, Kamil ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
This thesis deals with the topic of procedural parameters influence on the properties of welded joint in zinc-coated deep-drawing steels in laser welding with wobbling. First part of the thesis serves as an overview of laser welding technology, welding of steel with protective zinc layer and weld quality testing. Second part is dedicated to a proposal, process flow and evaluation of an experiment. Seven trial lap welding joints of DC04+ZE steel have been welded using different welding parameters. Specimens from these trial welds were used for metallurgical testing by macro-etch examination and for tensile strength break testing to get mechanical properties of welded joints.
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Laboratory Device for Measuring Headphones
Holub, Kamil ; Číž, Radim (referee) ; Schimmel, Jiří (advisor)
This bachelor's thesis deals with the design and assembly of headphones test fixture. The introduction describes the types of headphones, their classification in terms of design and their typical specifications followed by a description of instruments for measuring headphones, defined by standards ČSN EN 60318 and their classification in terms of design and use. The following part is devoted to a design of a test fixture, which is subsequently put together using 3D printing. As part of the thesis, the measurement of frequency response and input impedances of various headphones is performed on the fixture. These are then compared with measurements on professional measuring devices. In the last part is described a laboratory task, which includes the measurement of headphones using this test fixture.
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Welding of deep-drawing steels with a protective layer by means of an oscillating laser beam
Holub, Kamil ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
This thesis deals with the topic of procedural parameters influence on the properties of welded joint in zinc-coated deep-drawing steels in laser welding with wobbling. First part of the thesis serves as an overview of laser welding technology, welding of steel with protective zinc layer and weld quality testing. Second part is dedicated to a proposal, process flow and evaluation of an experiment. Seven trial lap welding joints of DC04+ZE steel have been welded using different welding parameters. Specimens from these trial welds were used for metallurgical testing by macro-etch examination and for tensile strength break testing to get mechanical properties of welded joints.
|
|
|
Influence of fluxes on weld metal properties
Holub, Kamil ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
This thesis deals with the topic of submerged arc welding – an electric arc method of fusion welding, that uses a layer of granulated flux to shield the weld pool from atmospheric gases. Theoretical part is devoted to the description of the welding method and fluxes currently used. The practical part contains an experiment, which consists of making two weld deposits on structural steel S235JR by using different fluxes. First weld deposit is made with OK 10.62 Flux. The same flux alloyed with the Tribaloy T-800 laser cladding powder is used for the second weld deposit. Test specimens are examined on the basis of influence of fluxes combined with a single electrode wire.
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