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Because of the unique combination of their properties, nanobainitic steels containing Si are particularly attractive materials for use in gear manufacturing. However, in order to achieve desired results, it is first necessary to obtain a surface of sufficient hardness (i.e. to increase the hardness of the surface layer using surface hardening techniques). One of such techniques is electron beam hardening...
Because of differences in physical and chemical properties of materials being joined as well as due to phenomena such as the formation of intermetallic phases, the making of dissimilar joints poses significant problems for the welding industry. Owing to its high power density, achievable high welding rates and the possibility of obtaining high metallurgical purity, electron beam welding is one of...
The surface hardening of steel components makes it possible to achieve high abrasive wear resistance without the necessity of hardening the entire cross-section of a given element. As a result, it is possible to apply lower stress and reduce the cost of the process. Because of very high heating rates (of up to 10^9 K/s) as well as the ease of dynamic deflection and focusing, the use of electron beam...
The article discusses tests performed within a state budget-subsidised research project Research into the Development of Joining Techniques for Battery Packs. The subject of research work includes the selection and development of technologies enabling the joining of battery cells and accumulators used in modern electric cars. The works conducted previously involved the performance of tests related...
The welding process is the subject of worldwide tests, primarily related to the effect of process conditions and parameters on the structure, geometry and the strength of joints as well as on the formation of welding stresses and strains (distortions). In spite of numerous test results, the welding process itself continues to be one of the reasons for the formation of distortions. Designers and manufacturers...
Thermal spraying is one of the most common methods enabling the deposition of variously-purposed layers on surfaces of structural elements. However, in certain cases, the process of spraying itself is ineffective in terms of the stability and properties of protective layers. One of the possible solutions making it possible to reduce the porosity and improve the adhesion of surfaced layers involves...
In many cases, the technology enabling the melting of thermally sprayed layers has no alternative. High-performance thermal spraying processes make it possible to obtain densely sprayed layers. However, previous research revealed that sprayed layers are characterised by porosity and numerous material imperfec¬tions. The above-named situation results from the specific manner of layer appli¬cation....
Increasingly high requirements concerning welded structures made of aluminium alloys trigger the issue of fatigue strength. Previous tests have indicated that the fatigue strength of FSW joints is higher than that of, e.g. MIG-welded joints. However, it should be noted that the use of the FSW technology may sometimes be limited or impossible. One of the methods enabling an increase in the fatigue...
Economic development urges design engineers to search for alternative structural materials enabling the fast erection of structures without incurring high investment costs and, afterwards, high running costs. Reinforcement bars are indispensable elements to most civil engineering structures. The article presents information concerned with composite rebars, i.e. their mechanical and physical properties,...
Modern civil engineering requires increasingly many concrete reinforcing bars, necessitating the satisfaction of increasingly restrictive operational, design and investment-related requirements. As a result, design engineers and contractors, including welding engineers, deal with bars fabricated using various technologies affecting both the properties and the structure of bars. The article presents...
The making of building structures entails the use of concrete-reinforcement bars (also known as rebars). Elements made of reinforced concrete have proved their unquestionable usability. However, in certain cases, the traditional approach involving the use of ribbed bars made of unalloyed steels fails to provide desirable results. The extension of the service life of structures exposed to seawater...
Recording results of visual radiation intensity of the TIG welding arc have been presented. The correlation between welding parameters and the intensity of welding arc visual radiation has been examined. The influence of disturbances of the welding processes on its radiation intensity was examined. By using the TIG arc model described in the literature, a mathematical correlation between the welding...
Recording results of visual radiation intensity of the TIG welding arc have been presented. The correlation between welding parameters and the intensity of welding arc visual radiation has been examined. The influence of disturbances of the welding processes on its radiation intensity was examined. By using the TIG arc model described in the literature, a mathematical correlation between the welding...
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