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Manufacturing of Welded Components
Podsedník, Jaroslav ; Prokop, Jaroslav (referee) ; Kalivoda, Milan (advisor)
This work describes changes related to the transition from manual welding to robot welding selected component within the product range of the company, in which the author works. The aim was to determine the time that you return investments in new technology and what will be savings for the planned production volume. Both points were met.
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Feasibility study of welding for stainless part „ guide rail"
Vaverka, Jiří ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
Robotization of industry is very important in these days. It is possible to replace human workers with robots and because of that make manufacturing faster. This master’s thesis includes feasibility study of robotic welding for stainless steel part guide rail. Quality of robotic welding was evaluated on testing pieces. Robotic welding was 88,5 % faster than current welding method. Costs of manufacture of one piece were 40 % cut.
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Robotic welding case of linear fluid motor produced from high-strength steel
Hejduk, Stanislav ; Slováček, Marek (referee) ; Sigmund, Marian (advisor)
The theses deals with the welding of high-strength steels S690 QL using the MAG method. The aim of the work was to conduct a feasibility study for welding VP steels. Welding took place in a robotic workplace. Welding parameters were calculated, and subsequently, a pWPS was created based on these parameters, according to which a test sample was welded. The welding was performed without preheating or post-weld heat treatment. The welded samples were then evaluated using non-destructive and destructive testing. No unacceptable surface defects were detected through non-destructive testing. Destructive testing verified the size of the heat-affected zone (HAZ), with the most significant influence observed in the cover layer, and a value of 2.5 mm was determined. The hardness test according to Vickers also yielded successful results, with the highest measured value being 377 HV0.2. The tensile test resulted in failure within the HAZ, but the mechanical properties were comparable to the base material. Therefore, the weld on the test sample was evaluated as successful.
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Welding of aluminum alloys with using SKS welding equipment
Šaloun, Jan ; Slováček, Marek (referee) ; Sigmund, Marian (advisor)
This thesis focuses on robotic MIG welding of aluminum alloys using welding processes from SKS Welding. The main task was to fine-tune the welding process to produce a weldment composed of profiles made of EN AW-6061 T6 alloy with a complicated cross-section connected by two fillet welds. Due to the limited number of profiles reserved for debugging, the welding process behavior was first tested on filled and overlap joints of 3 and 5 mm thick sheets made of EN AW-5754 H22 alloy with similar weldability to the alloy of the profiles. Both alloys could be welded using Argon 4.6 shielding gas and AlMg5 filler wire with a diameter of 1.2 mm. Fine-tuned KF-Pulse DP welding processes of sheets were used to initially set the welding parameters for the profiles. Variables were then gradually adjusted until acceptable visual and internal quality verified by metallographic cuts at the desired locations was achieved. A major challenge was to achieve the necessary penetration in areas where there were ribs. This requirement was achieved through a combination of different welding speeds, current values, and wire feed rates. Pores were reduced using the special Dual Pulse function.
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Welding manipulator construction design
Fuks, Šimon ; Tůma, Zdeněk (referee) ; Štěpánek, Vojtěch (advisor)
This bachelor thesis deals with the design of a five-axis welding manipulator as an additional device to a welding table. The research focuses on knowledge from arc welding automation, especially on the use of industrial robots and manipulators in this area. A rich selection of accessories for robotic arc welding is also summarized. In the practical part, several conceptual variants are proposed, and the most suitable variant is further developed. The basic technical calculations of the manipulator are presented and the individual construction details are discussed. Furthermore, the work deals with the safety and control possibilities of the designed manipulator. The work also includes a drawing of the overall assembly.
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Využití tavného svařování pro výrobu nízkotlakých nádob
Barták, Jan
The bachelor thesis deals with the issue of fusion welding of low-pressure vessels. The introduction is devoted to the division of fusion welding methods. It is an overview of current technologies that are commonly used in engineering production. The primary objective is also to outline the problems and specifics of the production of weldments intended for areas with higher mechanical stress. Then follows a description of the basic technical parameters for the production of a correct weld bead. This mainly includes the calculation of heat input, the use of current indicator and the correct selection of shielding gas. The issues of heat affected area and the possibility of structural changes in the basic material are also dealt with in detail. The primary focus of all indicators is on the TIG method. The following section explains the issue of welding low-pressure vessels using a robotic arm and a single-purpose semi-automatic machine. The conclusion of the thesis is devoted to control mechanisms of welded joints.
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Materials change of parts for harvester chain production
Houdek, Radim ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The work is focused on the track element, namely the replacement of the crossbar material from steel 27MnCrB5-2 to steel 30MnB5 from which the other parts of the cell, the cubes, and the bar are made and welded by the GMAW method. Changing the material and omitting the preheating phase would reduce the production time of the cell by approximately half the time. The theoretical preheating temperature calculated according to the relevant standard for both steels exceeded 200 ° C. Test specimens imitating the weld between the crossbar and the cube were welded on which a qualitative evaluation was performed. These were weldments of 30MnB5 steel with preheating (sample 10), 30MnB5 steel without preheating (sample 11) and 27MnCrB5-2 steel with preheating (sample 9). In terms of macrostructure, non-penetrations were found on all samples. Martensitic structure was found in all areas by microstructural observation. When measuring the hardness according to the Vickers method, approximately the same hardness profile was obtained in all weld areas of samples 10 and 11. The highest value reached 450 HV1 and exceeds the maximum hardness recommended by the standard. Due to very similar test results for 30MnB5 steel weldments with and without preheating, it is possible not to perform preheating. However, the results may be skewed by the relatively small size of the test specimens. For a reliable evaluation and final decision, it is necessary to perform tests on a real crossbar after complete production.
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Feasibility study of welding for stainless part „ guide rail"
Vaverka, Jiří ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
Robotization of industry is very important in these days. It is possible to replace human workers with robots and because of that make manufacturing faster. This master’s thesis includes feasibility study of robotic welding for stainless steel part guide rail. Quality of robotic welding was evaluated on testing pieces. Robotic welding was 88,5 % faster than current welding method. Costs of manufacture of one piece were 40 % cut.
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Digital commissioning of a robotic welding workplace
Sarvaš, Matej ; Szabari, Mikuláš (referee) ; Vetiška, Jan (advisor)
The aim of this work was to process the issue of digital commissioning of a robotic welding workplace. At the beginning, the current knowledge in the field of digitization, programming of industrial robots and welding has been described. In the practical part, a 3D model of the welding cell itself has been designed in the simulation software, then various variants of clamping jigs have been considered, and in the last part, the welding paths for the selected weldment has been designed.
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Design of a Robotic Cell for Weding Application
Rolinc, Lukáš ; Kubela, Tomáš (referee) ; Pochylý, Aleš (advisor)
The diploma thesis deals with the design of a workplace with robots designed for spot welding of wire reinforcement of the car seat. After analyzing and description of the given task, the workplace concept is chosen based on the input parameters. Subsequently, sub-systems of the production cell are designed and selected for this concept. For example the design of clamping fixtures, rotary table, input and output storage magazines or the selection of welding guns and robots are solved. The workplace is designed to ensure operator safety and protection. The production cycle of the designed workplace is simulated in Siemens Process Simulate to verify functionality and required productivity of the production line. Technical and economic evaluation of the proposed solution is also included in this diploma thesis.
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