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Laser preheating during of cobalt alloy cladding
Nevřivý, David ; Slováček, Marek (referee) ; Šebestová, Hana (advisor)
In this work, the possibility of using a laser beam for local preheating in combination with the MIG method in the cladding of Stellite 6 cobalt alloy on X12Cr13 steel was investigated. The surface temperature during heating by the laser beam, the temperature cycles and the cooling rate in the heat afected zone at different beam-arc distances were measured. The patterns were assessed based on the geometry and dilution achieved. The structure was evaluated in terms of macro and microstructure. The microhardness achieved was measured for its distribution throughout the entire clad with a focus on the heat affected zone. The performance parameters of the welding source were varied to evaluate their impact on the resulting dilution and changes in the geometry of the design. To achieve higher process efficiency, the cladding speed was increased and the clads were evaluated in terms of macrostructure and resulting clads geometry.
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Possibilities of the Tensile Test
Nevřivý, David ; Harant, Martin (referee) ; Řiháček, Jan (advisor)
The Bachelor’s thesis deals with the possibilities of tensile testing, the parameters of the test specimens, testing machines and the equipment which can be used in this test. Based on the literature review, the thesis explains the test principle, the measurement process and the strain and stress characteristics detected by the test. The thesis then focuses on the test specimens, their geometry, the method of their sampling and gripping into the machine. When describing the machines and equipment used in tensile testing, the thesis explains the functionality of these and their different types. The work also covers special types of tensile tests, namely those using elevated temperature, high-speed deformation, and cyclic or multiaxial stress. The final part of the thesis examines the current trend of evaluating the tensile test using 3D optical measurement systems
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Possibilities of the Tensile Test
Nevřivý, David ; Harant, Martin (referee) ; Řiháček, Jan (advisor)
The Bachelor’s thesis deals with the possibilities of tensile testing, the parameters of the test specimens, testing machines and the equipment which can be used in this test. Based on the literature review, the thesis explains the test principle, the measurement process and the strain and stress characteristics detected by the test. The thesis then focuses on the test specimens, their geometry, the method of their sampling and gripping into the machine. When describing the machines and equipment used in tensile testing, the thesis explains the functionality of these and their different types. The work also covers special types of tensile tests, namely those using elevated temperature, high-speed deformation, and cyclic or multiaxial stress. The final part of the thesis examines the current trend of evaluating the tensile test using 3D optical measurement systems
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