Wyniki wyszukiwania - Biblioteka Nauki

1

Aluminum alloy welding in automotive industry

100%

Szczucka-Lasota B. , Węgrzyn T. , Jurek A.

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tom T. 15, z. 3

67--78

EN

The paper presents the possibilities of using light alloy components in vehicle construction. Material 6082 was chosen for use in responsible structural components. The structure and strength parameters of the material in the delivery state were tested. Tested material parameters were compared with normative requirements. The purpose of the paper is to check the mechanical properties of aluminum alloy welded joints by various processes and parameters. Until now, welding of 6082 alloy did not give good and repeatable results. Because of that, two welding methods were analyzed (MIG and TIG) in the field of the quality of welds, strength of welded joints, and material structures obtained as a result of welding with various parameters.

2

Improvement of the mechanical properties of mobile platform stainless construction elements

100%

Szczucka-Lasota B. , Węgrzyn T.

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tom T. 17, z. 4

91--102

EN

Stainless steel could be treated as the main material used to construct various means of transport, including mobile platforms and tank trucks. An austenitic steel known as 316L steel (1.4401) has high resistance to atmospheric corrosion, natural waters, water vapor, alkaline solutions, and acids, even at elevated temperatures. This steel is weldable, although it is also prone to various types of welding cracks. Many factors influence the quality and mechanical properties of a joint. The most significant of these is the appropriate selection of welding parameters, which should be determined precisely and separately for each type of sheet, depending on its thickness and geometric features. The aim of the present article is to study the influence of main TIG (Tungsten inert gas) welding parameters on the creation of proper joints used in the construction of mobile truck platforms or tank trucks. The proper selection of parameters enables the production of welds with good functional properties. A novelty of this article is the proposal to weld each layer of a thick joint with different parameters, which has an important influence on the mechanical properties of the joint. It is expected that the new material and technological solution will yield a joint with good corrosion resistance and increased mechanical properties. This is important in the responsible construction of means of transport, using the example of mobile platforms and tank trucks. Different tests verifying the properties of joints, including non-destructive testing, tensile strength tests, and fatigue tests, as well as a hardness probe, were applied.

3

AHSS steel welding with micro-jet cooling in mobile platforms

100%

Węgrzyn T. , Szczucka-Lasota B. , Piwnik J. , Jurek A.

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tom T. 15, z. 1

131--139

EN

This paper focuses on the weldability of advanced high-strength steels (AHSS), commonly used by the automotive industry and civil engineering. These steels have found application in the construction of mobile platforms mounted on vehicles. AHSS significantly outperform other materials when it comes to performance flexibility and mass reduction potential. This article verifies whether the application of micro-jet cooling technology during the welding process might help to overcome these issues. The aim of this article is to choose welding parameters in the process with micro-jet cooling to obtain the best mechanical properties of the welded structure (elongation). The best welding parameters for these difficult-to-weld constructions are presented in detail.

4

Welding of mobile platform elements made from mixed grades of high-strength steels

100%

Szczucka-Lasota B. , Węgrzyn T. , Łazarz B. , Lukaszkowicz K. , Jurek A. , Wilczyński K. I.

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tom z. 107

197--203

EN

In the mobile platform structure, there is an increasing necessity to weld steels from the various groups. For instance, it has become necessary to connect AHSS (Advanced High-Strength Steel) with fine-grained steels. This article verifies the possibility of obtaining accurate mixed welded joints from different grades of DOCOL 1400 steel (from the AHSS group) with S700 MC steel (from the fine-grained steel group). The structure, quality and mechanical properties of the obtained welded joints were thoroughly analysed. The joints were made at various welding speed with preheating to 80°C and without preheating.

5

Comparative analysis of speech signal processing capabilities on mobile platforms Android and iOS

100%

Ciołek M.

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tom nr 9-10

IV--VII

EN

This paper describes the comparison of the two most popular mobile platforms in terms of speech signal processing. The test was carried out in terms of performance processing algorithm Pitch Synchronous Overlap and Add by two applications. Article also presents technical aspects of the implementation of the algorithm PSOLA on two mobile operating systems Android and iOS with the use of official development environments.

PL

Artykuł przedstawia porównanie dwóch najpopularniejszych platform mobilnych w kontekście przetwarzania sygnałów mowy. Badania przeprowadzono pod kątem wydajności alogorytmu Pitch Synchronous Overlap and Add by two (PSOLA). Wykazano również techniczne aspekty implementacji algorytmu PSOLA na platformach Android i iOS z wykorzystaniem oficjalnych narzędzi programistycznych dla tych środowisk.

6

Welding mobile platforms elements made of AHSS steel in view of new requirements in civil engineering and transport

80%

Węgrzyn T. , Jurek A. , Wszołek Ł. , Stanik Z.

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2019

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tom z. 103

209--218

EN

The developing automotive industry has prompted an increase in the demand for new welding technologies in civil engineering and transport that reduce the mass of mobile platforms mounted on vehicles and increase their operational range at the same time. The AHSS steels are the materials most commonly adapted for the production of motor vehicles due to their high tensile strength. Nonetheless, the joints created with their use are less strong from the native material. This article examined whether the application of micro-jet cooling would alter the mechanical properties of the welds. Based on the performed tests, joints with better quality that passed positively in the hardness and tensile strength evaluations were obtained. The presented research proves that the use of additional elements in the welding process significantly affects the quality of the obtained welds and brings satisfactory results with a greater repeatability than before.