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Study of properties of laser welds of Hardox 450 material using arc preheating
Debs, Martin ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
In this thesis is studied the influence of arc TIG preheating during laser welding of 2 mm Hardox 450 material sheets. This material achieves its good mechanical properties by processes of heat treatment. That causes problems during welding because of heat degradation. Experimental sheets were welded within various configurations of welding parameters and positions of TIG nozzle. Testing specimens were cut out by laser and were used for tension testing, Vickers hardness testing and metallographical testing (macro and microstructure). The results of using the second heat source are: wider heat affected zone, smoother transitions among its zones, reduction of toughness and hardness, finer grain structure and occurring ferritic microstructure. This hybrid technology, combination of laser welding and TIG preheating, is very productive creating joints with greatly good quality. The thesis also contains a comparison with common MAG welding method.
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Comparison of the welding productivity MAG and FCAW
Kutil, Petr ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
This thesis is focused on arc welding with MAG and FCAW methods. The first part contains a brief description of these technologies. Emphasis is laid on the principle of arc welding in active shielding gas and on additional materials, especially on solid and flux-cored tubular wires. The second, experimental part, centres on the comparison of MAG (135) and FCAW (136 and 138) methods in terms of the productivity, costs and, last but not least, the quality of fillet welds made in PF welding position. Based on the calculated and measured figures obtained from the experiment, the most suitable method for the given welding position was chosen.
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Comparison of the thermal influence by TIG method
Pavlas, Jan ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
The presented bachelor thesis deals with arc welding of stainless steels by welding method TIG. It compares the influence of pulse and DC current on the welded component. Introduction analyzes the influence of arc welding on metallic materials, heat introduced into the weld and the heat affected area. Two experiments on S235JR and 1.4301 steel were performed to verify theoretical assumptions. The effects of current on the material were evaluated using the analysis of the tests and the calculation and the conclusions were made. Finally I made recommendations for practice and possible further research on the issue.
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Arc welding of stainless steels for demanding working conditions
Matějíček, Josef ; Hála, Michal (referee) ; Kubíček, Jaroslav (advisor)
Bachelor thesis introduced deals with Arc welding of stainless steel. With welding technology, used by company DIAMO, the connected pipes, flanges and plates are for guiding the Sodium Sulphate solution, which is obtained as by-product in production of Uranium. Corrosive attack and weld cracking occurs in the short period of time due to the chemical reaction. Based on information about materials, used additional materials and welding technology used I have evaluated materials with susceptibility to the corrosion and the formation of hot cracks. Using tests and calculations I have examined the susceptibility of austenitic stainless steel to intergranular corrosion. Austenitic-ferritic stainless steel was also used as a theoretical solution for larger spectrum of materials. After calculations and evaluations of the trial tests I have conducted discussion and recommendations for use in practice.
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Welding parameters optimalization of robotic welding for car industry
Soprunenko, Valeriia ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
Thesis deals with individual technology of new welding processes "specifically FRONIUS TPSi". The greatest emphasis is on welding technology, especially on the differences between the individual methods. The experimental part of the thesis is focused on finding suitable parameters for welding filled welds.Everythingwith respect to required welds quality welded by robotic welding. The samples were evaluated in terms of penetration depth, amount of heat introduced and the number of defects.
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Virtual commissioning of the robotized workplace for arc welding
Adolt, Lukáš ; Pavlík, Jan (referee) ; Vetiška, Jan (advisor)
This diploma thesis is focused on the design of a robotic workplace for arc welding and its subsequent virtual commissioning. The summary deals with knowledge from industrial robotics and arc welding, the system analysis is focused on the composition of the workplace and the principle of arc welding, including acting influences. In the practical part, several variants of the solution are proposed, the most suitable variant is processed in the form of a 3D model. This model is then simulated, including all processes, a control program is created, and virtual commissioning of the workplace is demonstrated.
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Design of clamping device for tubular conductors
Schaffelhofer, Igor ; Tůma, Jiří (referee) ; Tůma, Zdeněk (advisor)
This bachelor thesis is focused on design of clamping device, which is a part of welding positioners for welding of aluminum tube conductors in ABB company. In the theoretical part, there are individual requirements of clamping devices with examples of their applications. The practical part is focused on the design of individual parts that meet the requirements for tube conductors and the functionality of the clamping system for arc welding of alluminium alloys.
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Design of MIG/MAG Welding Machine
Zelenitca, Darina ; Tvarůžek, Martin (referee) ; Sládek, Josef (advisor)
The topic of this diploma thesis is the design of a MIG/MAG welding machine, suitable for locksmiths and workshops. The diploma thesis includes the analysis of existing products from the design and technical point of view and deals with the design of welding machine. The proposed concept focuses on interactive and modern look of the machine and comfortable manipulation and easy operation. The design itself offers a possible direction of morphology of welding machines in the future.
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The effectiveness of welding on furnace structures.
Rousová, Michaela ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis is resolving all the possibilities of enhancing the efficiency of furnace structures welding. Small batch production does not offer many possibilities for implementing mechanization or automation. On the other hand, when using a big batch production, efficiency can be enhanced by means of a robotic workstation. When the production batch is big enough, we will see a costs save after a short time, mainly in labor costs. This means the return of investments will be in short time period. In the LAC company there are three types of products made. At laboratory furnaces the efficiency can be enhance by using fixtures. At other standard and atypical furnaces is very difficult to design fixtures or positioners because of their different sizes. Big complication can be also a company location on second floor. The most suitable product regarding to welding efficiency enhancement is big batch production of heaters. For this type the welding time can be shortened by means of a robotic workstation.
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Robotic welding case of linear fluid motor
Střechovský, Jan ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The work deals with the feasibility study of robotic welding of a linear actuator cover. The first part includes a literature review focusing on the specifications and impact of individual welding process components on the appearance and properties of the weld. Some basic calculations necessary for the proper progress of the experiment are also included. The experimental part of the work focuses on finding suitable welding parameters and subsequent evaluation of the welded samples in terms of resulting defects. The following section compares the efficiency of manual and robotic welding. The conclusion of the work summarizes the achieved results and the decision on the feasibility of robotic welding for the given joint.
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