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Kvalita svarových spojů
Pénz, Attila
The thesis may be divided into two parts, the theoretical and practical part. In the theoretical part of my thesis describe the permanent connection in engineering includes soldering, gluing, riveting and welding and further describe the building-up and weldability tests as part of the technological tests. In the practical part of my thesis describe what and how I was doing. How I progressed in the production of individual samples and testing. We can find there a description of the tensile test, graphical display each tensile test, measured and calculated values and evaluation of tests. Further describe the detection of microstructure and microhardness. Each photo of microstructure I worked to the table and commented what can we see on them. At microhardness we can read about the gist and execution of the test. Obtained values I compiled to the chart and commented. According to the hardness can recognize a structural component and phases. In conclusion is a summary of the measured values and evaluation.
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The hazards of harmful chemical substances in metal production environment, measuring and assessment.
GRUBEROVÁ, Michaela
The target of the thesis was to evaluate the risk of chemical harmful substances and dust in the working air of metal production. Four research questions were asked: {\clqq}What harmful substances are fixed in the working environment of the metal production?`` {\clqq}Are the hygienic limits of chemical substances and dust in the working environment of metal production observed?``, {\clqq}What measures were taken by the employer for the purpose of the health protection of employees?`` and {\clqq}Are the measures taken by the employer for the purpose of the health protection of employees effective?`` The thesis was treated as qualitative research. The followed file consisted of three South Bohemian companies dealing with metal production. The method of the direct, non participating and clear observation was applied for the data collection, moreover the study of documents {--} testing reports. The secondary analysis of data was performed. The results of measuring were compared with the hygienic limits fixed by the Directive of government No. 361/2007 Coll.. The evaluated professions were divided in categories pursuant the Directive No. 432/2003 Coll. In the working air of metal production, the concentration of the total dust, chromium, hexavalent chromium, carbon monoxide and ozone were followed. The last measuring in the monitored workshops proved that the hygienic limits were observed, except for two cases when the highest acceptable concentration determined for chromium and the chromium (II,III) compounds as Cr, and of the hygienic limit for welding fumes were exceeded. The most important protective measure applied by the employers on their workplaces was the reconstruction of air-conditioning, or installation of local exhausting. In view of the gradual decrease of the harmful substance in the working air in connection to the taken measures may be stated that the given measures were effective. The hypothesis {\clqq}Modernisation of operations in metal production improves the working environment of employees and in the modern operations no above-the-limit values of the most monitored harmful substances were found out. ``
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Metal welding and weld testing according to new norms ISO, EN and consequential ČSN
HAJNÝ, Tomáš
Work considers kind of materials joining via welding. At the begining the bachelor work considers history of this branch. Then there are norms and regulations ISO, EN and CSN for welding. Next part describes welding methods and weld tests. The last part is focused on common technology of welding. Ambition of this bachelor work is to create learning text and briefly show to the students, which are the methods and kinds of welding and welding tests and possibility how to use this methods in practice. Here are methods described theoretically and also examples from practice. This bachelor work can be used at pedaggical faculty for teaching this topic.
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