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Effect of the covered electrodes on the mechanical properties of the weld
Lukeštík, Filip ; Izák, Josef (referee) ; Kubíček, Jaroslav (advisor)
The thesis deals with the issue of shielded metal arc welding with covered electrodes, specifically focusing on the composition of the coatings and their properties. The literature study further addresses welding processes, technology, and weld testing. In the practical part, three electrodes with similar chemical compositions of pure weld metal were selected: the Böhler FOX EV 47 electrode with a basic coating, the Lincoln Electric Ferrod 165A electrode with a rutile coating, and the ESAB E-K 103 electrode with an acidic coating. Subsequently, experiments were proposed, including a tensile test and macrostructure observation. The electrodes were used to weld sets of designed test samples for the tensile test. The mechanical properties resulting from the tensile test were processed and evaluated. Furthermore, the macrostructure observation was conducted and assessed.
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Oxigen cutting of high strength steels
Lupták, Jakub ; Izák, Josef (referee) ; Kubíček, Jaroslav (advisor)
The work focuses on the issue of thermal cutting and its use for high-strength steels. Plasma cutting is most commonly used for cutting these materials, and this work explores the alternative possibility of cutting with oxygen. The theoretical part discusses high-strength steels, the possibilities of their thermal cutting, the selection of methods for the practical part, and their principles of operation. Specific methods for the experimental part are selected and detailed in terms of their principles of operation. The experimental part involves cutting selected samples of high-strength steels using oxygen and plasma at two different cutting speeds. Changes in hardness at the cutting edge are analyzed, and the size of the heat-affected zone for both technologies is evaluated. Finally, the suitability of oxygen cutting technology for high-strength steels is assessed.
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Examination of degradation frequently repaired shearing and forming tools
Izák, Josef ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The diploma thesis is focused on the renovation of forming tools made of tool steel, their weldability and assessment of the quality of tool repairs. The damaged tool was a part of the cutter from the progressive cutting tool made of Caldie steel. We used micro TIG technology to repair the damage. A total of three types of additional materials were used and investigated to restore the geometry of the damaged edge. One of the main purposes was to evaluate the possibility of extending the life of tools and reducing the implementation of already inefficient repairs. A number of destructive tests were performed for the assessment - macrostructure, microstructure, hardness measurement and EDS analysis.
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3D metal printing by wire welding methods
Přibyla, Dalibor ; Izák, Josef (referee) ; Sigmund, Marian (advisor)
This thesis presents the most commonly used technologies of 3D metal printing by wire welding methods, like WLAM, EBAM and WAAM. Deals with their principles, sub methods, applications, suppliers and also with current researches and trends, which are focused on deposition of thin layers. CMT technology is closely described, with attention on its certain kinds, like Cycle step, Advanced, Pulse Advanced, Pin and Braze+. Then, the CMT workplace at IMID DREAD, FME BUT is described by individual components, automatization and robotization. Final evaluation shows, that the chosen workplace is appropriate for required 3D print of magnesium alloys and overhanging structures, due to cold metal transfer technology and low purchase price.
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Application of WC grains by brazing
Izák, Josef ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
Bachelor thesis is aimed to assessment condition of brazing component barking plate. Solder contains grains of tungsten carbide is applied on steel due to raise hardness of plate. Applied solder with grains, does not only raise the hardness, but also multiply increase lifetime of plate. Technology, which is used to brazing, is oxy – acetylene flame. It will be examined two type of solder. In the first it is provided optical exam and then destruction exams (micro hardness, macrostructure, microstructure, SEM and EDS analysis). In the end It was proposed qualifications of brazer and exams of brazing join.
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Design of a welded go-cart frame
Kůřil, Michal ; Izák, Josef (referee) ; Kubíček, Jaroslav (advisor)
The work is focused on the design of a welded go-kart frame. The frame is welded from 32 mm tubes and 2 mm wall thickness. The material 25CrMo4 was chosen as it is widely used for frame structures in motorsport. The CNC CO2 laser was chosen to cut the tubes. Universal welding jigs were chosen due to the single piece production. Furthermore, metallographic tests of three samples were performed. Two were TIG welded, and one was MAG welded. There was chosen an austenitic filling material, which has good tenacity, and it is assumed to provide long lifespan while being mechanically loaded. Also, the Vickers hardness test was done.
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Assessment of suitability welding modes MIG PULSE and MIG DOUBLE PULSE for repairing of forging die
Sotolář, Vojtěch ; Kubíček, Jaroslav (referee) ; Izák, Josef (advisor)
The bachelor thesis is focused on the renovation of forging dies by pulse methods, specifically MIG pulse and MIG double pulse. The subject of this research was a part of forging die made of steel Wr.Nr 1.2343ESU (H11), however the problem was simplified to the welding of four prisms with the same type of material. The main goal was to evaluate whether these methods can be utilized to speed up the entire renovation process as the welding speed is its undeniable advantage. There were used two types of welding materials to assess the suitability of the renovation. For the tough weld was used the martensitic material CRONITEX RC 58 and for the interlayer was used austenitic-feritic material WELCO A1660. The assessment was conducted based on the non-destructive visual test and also based on destructive tests of macrostructure, microstructure and hardness measurement. The experiment results showed that configuration of tough material with interlayer is inappropriate. The most suitable process seems to be the welding of only tough layer without any interlayer.
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3D metal printing by wire welding methods
Přibyla, Dalibor ; Izák, Josef (referee) ; Sigmund, Marian (advisor)
This thesis presents the most commonly used technologies of 3D metal printing by wire welding methods, like WLAM, EBAM and WAAM. Deals with their principles, sub methods, applications, suppliers and also with current researches and trends, which are focused on deposition of thin layers. CMT technology is closely described, with attention on its certain kinds, like Cycle step, Advanced, Pulse Advanced, Pin and Braze+. Then, the CMT workplace at IMID DREAD, FME BUT is described by individual components, automatization and robotization. Final evaluation shows, that the chosen workplace is appropriate for required 3D print of magnesium alloys and overhanging structures, due to cold metal transfer technology and low purchase price.
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Examination of degradation frequently repaired shearing and forming tools
Izák, Josef ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The diploma thesis is focused on the renovation of forming tools made of tool steel, their weldability and assessment of the quality of tool repairs. The damaged tool was a part of the cutter from the progressive cutting tool made of Caldie steel. We used micro TIG technology to repair the damage. A total of three types of additional materials were used and investigated to restore the geometry of the damaged edge. One of the main purposes was to evaluate the possibility of extending the life of tools and reducing the implementation of already inefficient repairs. A number of destructive tests were performed for the assessment - macrostructure, microstructure, hardness measurement and EDS analysis.
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Application of WC grains by brazing
Izák, Josef ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
Bachelor thesis is aimed to assessment condition of brazing component barking plate. Solder contains grains of tungsten carbide is applied on steel due to raise hardness of plate. Applied solder with grains, does not only raise the hardness, but also multiply increase lifetime of plate. Technology, which is used to brazing, is oxy – acetylene flame. It will be examined two type of solder. In the first it is provided optical exam and then destruction exams (micro hardness, macrostructure, microstructure, SEM and EDS analysis). In the end It was proposed qualifications of brazer and exams of brazing join.
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