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Preparation and welding of the pressure aluminium pipes
Kocák, Tibor ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
The project is an analysis of technology production of pressure pipes made of aluminum alloys. The basis is a literary study of TIG technology, aluminum heat-tretable and non-heat-treatable materials. The flange-material is EN AW 5083 and the pipe is made of EN AW 6005A. The design of the welding is compromise between the preparation, the cleaning of the welding edges and the weld metal backing strip. Weld was made in real production. Examined impacts are evaluated on the basis of destructive and non-destructive welding test methods. After heating process of weldment material exhibits better mechanical properties. Using the economical and technological evaluation were selected sutiable proces parameters. The result is a suitable weld of the pressure vessel. Further optimization is possible through automation and robotics.
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Welding of pipes made of CrMo steel
Matějek, Martin ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
The aim of this diploma thesis is to compare mechanical properties of welded joints on tubes from 32x2 mm. Tubes are made from 25CrMo4 steel, which is used for production of racing kart chassis. The steel has a tensile strength of Rm = 800 MPa and up to 1200 MPa after refinement. For welding of samples are used technologies MAG and TIG.
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Optimization of the laser cutting technology of tubes with a square cross section
Podaný, Petr ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
The master thesis deals with the design and manufacture of tabbed joint in the profile with a square cross section using laser cutting. They examine their suitability and impact on the following MAG welding operation in terms of efficiency and accuracy. The theoretical part provides basic information about lasers used in industry and laser cutting methods. There is also a section dedicated to laser apparatus for tube cutting along with problematic about the laser cutting profiles. The experimental part describes the procedure of designing tabbed joint, making samples and measuring them. In the end, the individual samples are compared in terms of angular deflection after welding. The thesis also contains a technical-economic evaluation, where the costs of individual operations are quantified.
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Optimizing of robotized tandem welding with availing of laser cameras
Paťha, Vladimír ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
This bachelor thesis deals with efficiency of new robotic welding cell in terms of speed, quality and productivity. This new robotic welding cell use a tandem welding torch and laser offline sensor for setting position of the seam. This new robotic welding cell use also dual axis rotator for better positioning and loss risk of weld metal flow. For all robotic welding cells is the same welding technology acc. international standard EN ISO 4063, welding method 138 and the same shielding gas M 21, acc. international standard EN ISO 14175, mixture of 82 % argon plus 18 % carbon dioxide.
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Use of laser scanning head for surface hardening
Jedličková, Veronika ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
The diploma thesis addressed the issue of laser surface hardening using dynamic oscillation of the laser beam. The theoretical part presents the hardening technology and suitable using of laser equipments. The fiber laser YLS 2000 was used in the experiment and the hardened material was steel 12 050, which is suitable for laser hardening. The influence of two selected parameters of the scan head on the resulting structure and hardness of hardening layers was examined. Based on the results, the choice of optimal parameters for identical conditions with the experiment was recommended.
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Friction welding of materials
Chrást, Daniel ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
Práce se zabývá zkoumáním svárů z materiálů AISI 316L a TI GR2. Svár je zhotovený rotačním třecím svařováním. První část práce je literární rešerše na téma rotačního svařování třením. V druhé části práce jsou uvedeny výsledky zkoumání svařovaných spojů. Byla zkoumána jejich makrostruktura, mikrostruktura, mikrotvrdost ve všech oblastech svarového spoje, materiály prošly zkouškou chemického složení a svarový spoj byl vystaven tahové zkoušce.
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Welding the frame of the tandem bicycle
Rajm, Vojtěch ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
In the first part of thesis were compared frames of two different bicycles and according to this comparison was designed a geometry of tandem bicycle. In a next part were described the most common materials in cycling industry and theirs advantages and disadvantages. According to the comparison, the steel EN 25CrMo was considered as the most suitable material for its low prize and high strength. After that is described weldability of steels and types of cracks which are one of the most casual defects in welded materials. In another part of thesis are theoretically described kinds of suitable welding methods for bicycle frames. As the most suitable are methods in shielding gases MIG/MAG and TIG. As the best method was chose TIG welding. In a practical part of thesis are compared these methods experimentally. Tubes from selected material were welded by MAG and TIG. The TIG welding proved again as better because of deeper and tough welds.
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Optimalization of the welding process for low - pressure tubular sets
Urbánek, Štěpán ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The diploma thesis examines the implementation of the production process of low-pressure pipe sets for hydraulic aggregates in the company Bosch Rexroth. The first part presents a literature analysis of used technologies and basic welded materials. The second part focuses on selected subprocesses ensuring the production and proposals for their streamlining. It includes a summary of responsibilities across departments and a template for processing the necessary technical documentation for the smooth running of production. Another proposal includes a technological procedure for practical verification of the production, which simultaneously serves as a basis for measuring the welding time. The reason for the implementation of this production was the extended delivery time of pipe sets from suppliers and possible financial savings. The practical part is concluded with a technical and economical evaluation, which expresses the possible financial savings in the production of low-pressure pipelines instead of the current state involving the cooperation with suppliers.
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Qualification of welding procedure for aluminium alloy AW-5083 H111
Krejza, Jan ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
The diploma thesis deals with the qualification of welding process of aluminum alloy EN AW-5083 H111. This aluminum alloy was used to make a Venturi tube. Therefore, a literature review has been developed dealing with the properties and use of aluminum and its alloys. The next chapter deals with the weldability of aluminum, aluminum alloys and the weldability of EN AW-5083 alloy. Part of the work is devoted to the used TIG method and its specifics when welding aluminum materials. The practical part of the thesis deals with the actual qualification of welding procedures according to the relevant standard and evaluation of production conditions according to the product standard. The last chapter deals with the overall manufacturing process of the Venturi tube.
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Welding of steel C45
Hála, Kamil ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
The aim of this bachelor‘s thesis is to propose a suitable welding parameters for a small part of steel C45. This steel contains a high percentage of carbon and therefore is difficult to weld. Gas shielded arc welding techniques were considered to be used, and from such techniques, the TIG method seems to be the most advantageous one. For this technique were suggested three groups of parameters and the most suitable one was chosen to be used for the production. The option chosen is of a welding power I=40 A and with preheating 200 °C. The component is made in the single-part production in SAAB Czech s.r.o.
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