he aim of this work is to compare two methods of resistance welding process control and its influence on the quality of spot welded joints. As the base material, 22MnB5 hot-formed high strength manganese-boron steel with an AlSi coating was used for the body strength elements in the automotive industry. The steel sheets were heat treated prior to welding to simulate the heat cycle during hot forming. The heating temperature was 920 ° C and the holding time at 7 minutes, 11 minutes, 14 minutes and 5 minutes. A spot press from Dalex and an Elmatech adaptive control power source were used for spot welding. For the evaluation of welded joints, a mechanized shear test, a measurement of weld diameters was used lenses and metallographic tests

In order to create a high-quality coating of titanium and its alloys, it is necessary to ensure perfect gas protection of the bath from the effects of air oxygen. Inert gases such as argon or helium with a purity of 99.999% are used. Gas protection must be maintained until the temperature drops below 300 °C. If the protection is not good enough, there is an undesirable reaction with oxygen, to reduce the mechanical properties and to discolor around the weld. The paper presents a procedure for the preparation of a welding jig for the welding of titanium and other sensitive materials by the plasma welding (PTA) method. Manufacturing processes and subsequent surfacing are described. The aim of the paper is to create a functional welding jig that provides sufficient protection for the entire process of surfacing sensitive materials.

In today`s dynamic business world full of opportunities and business transformations, companies need to become more agile while managing their risk. Risk assessment gives to industrial companies a mechanism for identifying the risks, which can represent opportunities and which, in their way, can represent potential danger. With a smart conducted risk management, project managers take a deep perspective on identifying the risks that could cause a company to fail to meet its strategies and objectives. This study provides a background for future creation of a comprehensive quantitative approach to risk assessment in a project of engineering company. Into account are taken changes coming to traditional risk management process caused by implementing the Industry 4.0 in the automotive industry. The aim of the new proposed approach for risk analysis, is to provide a fertile ground for project managers during planning the development project on dealing with risks and reach the project success with the reduced costs.

This article deals with the development of NC programs and parameters analysis of machining process. Software tool analyze from created NC program important parameters like length of linear increments, feedrate, increments in machine axes, reversing rotational axes etc. Mentionted parameters affect final surface quality and productivity of machining. Parameters are color-visualized on the toolpath points. Given color is assigned according to the parameter value. Based on results of analyzing tool and personal experienes the technologist can evaluate risk areas in machining process that leads to deterioration of the workpiece surface and change machining process strategy to improve the quality of the surface and reduce the machining process time.

The purpose of presented work is the aerodynamic comparison, especially the generated drag force, of the two train models used in Poland. Another thing is the comparison of the resulting drag force for different turbulence models used in the CFD calculations. 3D geometries based on the real dimensions of Pendolino ED250 and Impuls 45WE trains are created in Autodesk Inventor. Numerical flow analysis are carried out in the Ansys Fluent software. This analysis contain comparison of the basic flow parameters and influence of mesh on the results.

The theoretical part summarizes the basic information and principles of compressors of aviation jet engines. The main aim is to explain to the readers the problematics of axial machines. The following chapters describe designing and construction of an experimental facility for testing and developing components of fan propulsion. The thesis evaluates the pros and cons of the used design, especially the manufactory and construction. This bachelor thesis is focused on measuring the characteristics of the model fan. The thesis compares the used methodology of measurement which has been done and tries to optimize it. The final result is the model fan characteristics.

This thesis is focused on computing performance of an aircraft with asymmetrical powerplants and on determining operational limitations of the aircraft caused by different thrust of both engines. The flying laboratory for the flight test is Beechcraft King Air 350. It is a twin Turboprop aircraft, on which one engine has been swapped with a more powerful experimental powerplant. The theory of the ideal propulsor was used to determine thrust and effectivity of the original powerplant, the P&W PT-6A-60A. Calculations of the experimental powerplant were based on a mathematical model matching the performance class of GE Catalyst.

Nowadays the great emphasis is placed on making production as efficient as possible while reducing production costs. For this reason, before introducing new technologies into production, companies want to make sure that innovation will pay off and will remain competitive. The aim of the paper was to create a model of a digital factory and then to make several variants of simulations. This production system uses additive technologies (3D printing) along with conventional technologies. The simulations were done in Plant Simulation software from Siemens and they should identify bottlenecks in the production system and verify the correctness of capacity calculations. Subsequently all simulations were evaluated and compared with each other.

Tato práce je věnována problematice slévárenské oceli G22NiMoCr5-6 s dobrou svařitelností se zaměřením na výrobu metodou vytavitelného modelu používanou ve firmě Kdynium a.s., kde autor práce působil v rámci praxe metalurga v technologickém oddělení. Je provedena analýza struktury a mechanických vlastností G22NiMoCr5-6 v závislosti na parametrech tepelného zpracování. Byla použita metalografická analýza pomocí světelného mikroskopu, měření tvrdosti, zkouška tahem a zkouška rázem v ohybu v rozsahu -40 °C až 100 °C. V první části vzorky byly kaleny z teploty 950 °C a dále popuštěny variantně při teplotách 560 °C, 580 °C a 610 °C. V druhé části práce je provedena analýza normalizovaného stavu a dále analýza vzorků normalizačně žíhaných při teplotě 940 °C a zušlechtěných za stejných podmínek jako v první části experimentu.

A presentation will focus on a theoretical design of the wind turbine for the unspecified location, called “ Numerical method of the wind flow frequency probability and the electrical energy production calculation for different types of wind turbines“. There will be discussed a program providing with a probability chart, which takes in consideration technical features of modern wind turbines, aiming to build a universal scheme for a wide range of efficient production and economical use, considering different geological and legislatively divergent locations. There will also be a focus on the strategy of wind flow prediction and exact definition of losses, considering both physical and surroundings conditions.

The paper is focused on analysis of mechanical properties and microstructure of nickel superalloy Inconel 718, which is prepared by advanced 3D Direct Metal Laser Sintering (DMLS) (X, Y, XY, Z). The resulting mechanical properties are compared to conventionally produced Inconel 718. Samples produced both in conventional manner and by 3D printing have undergone the same heat treatment method. Light and electron microscopy are used for microstructure analysis.

The purpose of this work is the numerical analysis of the vehicle shape influence on the air flow and drag coefficient. Authors proposed four car concepts which must meet special dimension criterions. In the structure must be provided place for a driver seat, steering system and all mechanical components. The all models was designed in 3D program Autodesk Inventor. First chapter present localization of the components and elements in the vehicle. Authors defined the boundary conditions to get the streamlined parameters. In the paper also the calculation methods are presented and described. CFD analysis are carried out for proposed geometries. The simulations are performed with the use of the ANSYS Fluent software. In succession was created comparative analysis. It was used to choose the optimal shape. Paper presents useful application of the CFD calculations for the preliminary elimination of inadequate shapes.