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Spot welding workplace automation
Chlup, Adam ; Tůma, Jiří (referee) ; Knoflíček, Radek (advisor)
Bachelor thesis made in collaboration with Norma Czech s.r.o. company deals with designing and implementing automated spot welding workplace. The first part of the bachelor thesis is describing current information and knowledge about clamping of weldments and its manipulation. Using the knowledge of welding jigs, a design of not only welding jig, but also of the entire welding workplace with automation elements is then made. This design is then implemented in practice with main goals to save as much as possible space in the production hall, increasing productivity and effectivity of workplace. Thanks to the application of the UR 5 robotic arm in work cell is productivity measured by number of pieces per people hour (PPH) increased by 96 %.
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Development and characterization of new method of interconnection between leads and thick film layer
Hurtík, Pavel ; Skácel, Josef (referee) ; Otáhal, Alexandr (advisor)
This work deals with different ways of interconnection between leads and thick film. It also includes the development and characterization of a new method of connecting leads, namely spot welding on thick film technology. The tips of the welding pen were modified to reduce the size of the resulting welds. To achieve a better-quality connection is used galvanic platting of contact pads. Final welds were then tested by mechanical strength testing (shear test, peel-test) and the optical method of evaluating the quality of the weld using metallographic cutting was used. Using this technology, a new inseparable connection can be achieved.
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A proposal of innovation technology for joining of components for specific purposes
Berka, Miroslav ; Jaroš, Aleš (referee) ; Píška, Miroslav (advisor)
The main goal of the diploma thesis is a proposal of alternative metal sheets joining technology which would replace the current technology of spot welding. Different variants have been proposed, and the one which suits the most, the technology of clinching, was compared to the existing one. The costs have been calculated and following results have been concluded: the return of investment of clinching press is about 2 years. In the case of handheld tongs it is 1 and a quarter of a year. Annual savings of clinching press are 234 485 Kč, and in the case of handheld tongs are 258 019 Kč.
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Strength point connections in the soft and hard mode welding
Steiner, Jaromír ; Kubíček, Jaroslav (referee) ; Kandus, Bohumil (advisor)
Spot welding of 1.4307 material of 1+1 mm thickness is tuned out excellently by the enterprise ROSTEX – at the changes only of the welding current it was managed to approach the value of thickness achieved by enterprise ROSTEX. At the welding of 1.4307 material of 2+2 mm thickness it was managed to achieve more strength under welding parameters: Fs = 5500N, Is = 8,964 kA, ts = 10 Per. Spot welding of 1.0330 material revealed a possibility in proceeding with welding current increasing which could stand for the weld strength increasing (not necessarily) – a limit where material could splash was not achieved. The soft mode welding is not convenient for up-to date spot welding because the material is extremely affected by heat at the long welding time, it also leads to huge thermal losses, thermal effect and distortion of electrodes (electrodes life diminishing). Soft mode welding is not expedient even economically. In accordance with economic comparison, see chart 27, page 64 – for instance welding of 1.4307 material with 1+1 mm thickness at 1000 welds there is difference of 644 Czech crowns between the hard and the soft mode welding in benefit to the hard mode.
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Certification of company according to ČSN EN 15085 and ČSN EN ISO 3834
Kazdera, Tomáš ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
The project elaborated in frame of engineering studies is focused on the certification of the company SW-MOTECH sro in the welding of steel structures for rail vehicles. According to standards ČSN EN 15085 and ČSN EN ISO 3834. The first part focuses on theoretical introduction to the used welding methods. The second section describes the destructive and non-destructive tests on individual welding methods, including their evaluation. Based on work tests pWPS is exposed to welding procedure WPS
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Technologie bodového svařování
Oral, Martin
Bachelor thesis describes the technology of resistance spot welding. Outset, the work focuses on the historical development of a resistance welding, basic characteristics and principles of pot welding. It focuses description of the main parts of spot welders, more structure, properties and functions when making connections. The last part focuses on the shortcomings of the technology and the methods used to control the quality and strength of welded parts.
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