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Research, Optimization and Starting the Production of Heavy High-Alloy Cast Irons
Kaňa, Václav ; Elbel, Tomáš (referee) ; Martínek, Ludvík (referee) ; Šenberger, Jaroslav (advisor)
The work is particularly aimed at metallurgical problems connected with manufacture of castings of weight about 1 up to 40 tons from high-alloy austenitic nickel cast irons also known under the trade name Ni-resist. The main aim is to check and complement the knowledge about manufacture of heavy castings from austenitic nickel cast irons in a field of control of tapping and casting temperature, carbon content control with regard to the prediction of eutectic composition and in a field of setting a suitable chemical composition of cast iron with regard to the formation of chunky graphite and stability of the austenitic matrix and further on also possibilities of cast iron filtration during pouring the castings. Based on done experiments the formulae were determined that enable to calculate eutectic and liquidus temperatures on the basis of chemical composition of the cast iron. The use of several formulae given in the literature for calculating the carbon equivalent of austenitic nickel cast irons was compared and evaluated. For utilization of determined results in practice a calculating programme has been compiled making possible to be used in operational practice. This programme is named Calculation of casting temperature of Ni-resist cast irons. After the entry of the melt chemical composition the programme calculates the all important parameters necessary to know and to be controlled for manufacture of high quality castings from austenitic nickel cast irons. Eutectic temperature, liquidus temperature and then based on it the tapping and casting temperatures are included among those parameters. Further on there are eutectic concentration of carbon, carbon equivalent, nickel equivalent, and a criterion evaluating a danger of chunky graphite formation.
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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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Mode of production of PREWAG bridge concrete
Chalupa, Karel ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis introduces manufacturing documentation needed for the production of a PREWAG welded steel structure. It deals with the execution of the welds as well as with the construction execution and the technological and welding procedure in the production. A selection of drawing documentation and particular WPS techniques is included.
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Využití tavného svařování pro výrobu nerozebíratelných spojů u ocelových potrubí
Tejkal, David
The master thesis is focused on using a fusion welding for non-detachable constructions of steel carbon pipes production. The first part of master thesis is focused on a selected recent welding technologies used for carbon pipes welding. The weldability of basic materials is always significantly affected by chemical structure and so-called carbon equivalent as well. The second part of thesis is dedicated to mechanical properties of welding joints in the dependence of carbon equivalent. The practical part of thesis is divided into several sections. The first section of the practical part consists in the preparation of few weldment samples using various technologies of fusion welding according to own choice. All the preparation of pipe samples and the weldments make out proceeds according to every single reserved welding criteria and specification. The pipe weldments are put to the single non-destructive and destructive tests to find out and analyse the quality of single welding joints. The penultimate part is dealing with mechanical and metallographic tests of single welding joints based on which he carries out the evaluation of welding joints. After getting the non-destructive and destructive tests of single welding joints done the resume evaluation of welding joints and illustration of the examples of their practical using in technical practice are carried out in regard of information that were gained from single inspections and tests.
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Research, Optimization and Starting the Production of Heavy High-Alloy Cast Irons
Kaňa, Václav ; Elbel, Tomáš (referee) ; Martínek, Ludvík (referee) ; Šenberger, Jaroslav (advisor)
The work is particularly aimed at metallurgical problems connected with manufacture of castings of weight about 1 up to 40 tons from high-alloy austenitic nickel cast irons also known under the trade name Ni-resist. The main aim is to check and complement the knowledge about manufacture of heavy castings from austenitic nickel cast irons in a field of control of tapping and casting temperature, carbon content control with regard to the prediction of eutectic composition and in a field of setting a suitable chemical composition of cast iron with regard to the formation of chunky graphite and stability of the austenitic matrix and further on also possibilities of cast iron filtration during pouring the castings. Based on done experiments the formulae were determined that enable to calculate eutectic and liquidus temperatures on the basis of chemical composition of the cast iron. The use of several formulae given in the literature for calculating the carbon equivalent of austenitic nickel cast irons was compared and evaluated. For utilization of determined results in practice a calculating programme has been compiled making possible to be used in operational practice. This programme is named Calculation of casting temperature of Ni-resist cast irons. After the entry of the melt chemical composition the programme calculates the all important parameters necessary to know and to be controlled for manufacture of high quality castings from austenitic nickel cast irons. Eutectic temperature, liquidus temperature and then based on it the tapping and casting temperatures are included among those parameters. Further on there are eutectic concentration of carbon, carbon equivalent, nickel equivalent, and a criterion evaluating a danger of chunky graphite formation.
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Mode of production of PREWAG bridge concrete
Chalupa, Karel ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis introduces manufacturing documentation needed for the production of a PREWAG welded steel structure. It deals with the execution of the welds as well as with the construction execution and the technological and welding procedure in the production. A selection of drawing documentation and particular WPS techniques is included.
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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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