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Influence of welding direction on depth of penetration for MAG method
Šmak, Radim ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
This bachelor thesis deals about Influence of welding direction on depth of penetration in S 235 JR steel for MAG welding. First theoretical part of the thesis was devoted to a description and technology of the chosen method. In the second practical patr of the thesis was designed optimal welding parameters and conditions of welding. Based on them was performed an experiment. From the experiment was detected the depth penetration, heat affected zone and structure of the metal.
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Working chamber of electron beam welder
Červinka, Petr ; Mrňa, Libor (referee) ; Daněk, Ladislav (advisor)
The submitted work deals with the design of the working chamber of the electron beam welders. This vacuum chamber of the cubic shape, with a volume of approx. 100 litres will be used in the ÚPT of the AV ČR v.v.i. during building an experimental welding with electron gun performance 2 kW with accelerating voltage 60 kV. The theoretical part is about the theory of electron welding, electron beam welders of basic sections of the facility, and about possibilities of the technology for welding working chambers. In the practical part of the thesis is being thought out the design of the working chamber (construction chamber in design software), the strength test of construction chamber in the software ANSYS and the design of appropriate methods of welding. The sample of the material which is the stainless steel 17240, from which the chamber will be made, have been used in methods of welding TIG and MAG that was verified by the suitability of the chosen methods of welding.
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Welding head of the longwall shearer
Adam, Karel ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
The aim of this bachelor thesis is to describe the structure and purpose of the longwall shearer drum to descriebe the technological process and to design the technology. Shearer heads are made by welding, MAG method with a protective atmosphere of CORGON 18 (18% CO2 + Ar) was selected. Increasing the strength of the knife holders, made from steel 15 230.3 to 1600MPa and welding to the helical segment of S355J2 + N steel, these clamps cracked cold. An error has been detected by reviewing the entire process and performing calculations. The preheating temperature was too low and was therefore increased to 270 ° C along with the stay for 2 hours at this temperature. Part of the thesis is a sample of the test weld of the rupture holder.
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Proposal of technological procedure for welding pressure vessel
Reich, Martin ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
The work presents a proposal for a suitable technology for the welding of the pressure vessel of the LPG gas phase separator. There are three different methods of welding of the separator body proposed and the economics of producing the separator for a given series of pieces is assessed. There is a comparison of hand electrode welding, MAG welding and TIG welding. Further, a brief overview of possible types of non-destructive testing is added and the three selected tests are properly executed and detailed. An overall evaluation of the experiments performed is included and the possible future development outlined.
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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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LaserHybrid utilization in welding and brazing
Labaj, Petr ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
LABAJ Petr: LaserHybrid utilization in welding and brazing The thesis deals with the basic knowledge of LaserHybrid welding, which is a combination of laser welding, and arc welding. There is also mentioned the use of shielding gas, which has a major impact on the entire welding process. Other part deals with the practical use of the welding method, it analyses the differences in diverse applications according to an industry sector, a type of used material and especially their advantages and disadvantages. LaserHybrid is a welding technology, which has a huge potential to cause a revolution in the field of welding. Its characteristics such as efficiency, quality and accuracy with which LaserHybrid systems operate are highly required. An example is the shipping industry, where was achieved a cut in production times and substantial positive economic outcome.
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Analysis of welding by LASERHYBRID process
Teplý, Jan ; Hála, Michal (referee) ; Kovář, Petr (advisor)
The project is elaborated for the basic analysis of hybrid welding that combines laser welding with other welding methods, especially with the MIG and MAG technologies. Besides the Laserhybrid process the methods, of which this Laserhybrid welding is composed, are also presented here. These methods are compared considering the aspects: firstly their advantages or disadvantages, followed by the welding performance, the economic aspect or the application in mechanical engineering. The welding using the relatively new and so far not much widely used Laserhybrid method is very efficient especially for the weld jointing of various bodywork parts. Respectively, this method is efficient for its smaller molten pool, better gap bridging and also for its economic aspect to reduce production times.
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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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